Title: Water Levels and Rates of Flow
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 Material Information
Title: Water Levels and Rates of Flow
Alternate Title: SWFWMD. Rules, Chapter 40D-8, Water Levels and Rates of Flow
Physical Description: 90p.
Language: English
Publication Date: September 19, 1997
 Subjects
Spatial Coverage: North America -- United States of America -- Florida
 Notes
General Note: Box 5, Folder 12 ( SF MINIMUM FLOWS AND LEVELS, Volumes 1 and 2 ), Item 24
Funding: Digitized by the Legal Technology Institute in the Levin College of Law at the University of Florida.
 Record Information
Bibliographic ID: UF00052677
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: Levin College of Law, University of Florida
Rights Management: All rights reserved by the source institution and holding location.

Full Text




1 The bold underline and boed stricken language indicates changes proposed to the

2 September 9,1997, draft approved by the Governing Board and published September 19,

3 1997, in the Florida Administrative Weekly.

4 RULES OF THE

5 SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT

6 CHAPTER 40D-8

7 WATER LEVELS AND RATES OF FLOW

8 40D-8.011 Policy and Purpose

9 40D-8.021 Definitions

10 40D-8.031 Implementation

11 40D-8.041 Minimum Rfetese- Flows Aend-6eve.ls

12 40D-8.091 Publications Incorporated by Reference

13 40D-8.603 GuidanceMn gmnt Levels for Lakes and Other Imp-undment

14 40D-8.605 Cyclic Variations for Minimum Water Level

15 40D-8.611 Minimum Flood Levels

16 40D-8.613 Ten (10) Year Flood Warmic Levels







20 40D-8.624 Oehedulk ef Establishment of Levels for L'kc--3 nd Wetlands- nd-G there

21 Impetndments"

22 40D-8.625 Establishment of Minimum Lake Levels

DECEMBER 12, 1997 BOARD DRAFT 8-1










1 40D-8.626 Minimum Aquifer Levels in Priority Areas of Hillsborouah County North of

2 State Road 60, and Pasco and Pinellas Counties

3 40D-8.011 Policy and Purpose.

4 (1) The purpose of Chapter 40D-8. F.A.C,, is to establish Mminimum Eflows and

5 Uevels at specific locations throughout the District pursuant to Sections 373.042 and

6 373.0421. F.S.. to describe how the Minimum Flows and Levels will be used by the District.

7 In those areas where the long-term eetuet flow or water level is below the Minimum Flow

8 or Level the District will implement a recovery strategy which will be contained within the

9 District's Water Management Plan and. if required by law. portions or all may be adopted

10 by rule.

11 (2) Where appropriate, Mminimum Flows and Lievels may reflect seasonal

12 variations and may include a schedule of variations and other measures appropriate for

13 the protection of non-consumptive uses andef the water resources.

14 (3) A further purpose of Chapter 40D-8. F.A.C.. is to establish minimum fleed

15 level- and--" wmng Guidance Lievels for surface waters-which are anticipated to occur

16 on a somewhat regular basis, and which shall serve as a precautionary warning to all

17 persons who would propose to construct facilities which may be damaged by periodic high

18 water levels.

19 (4) Minimum Fflows and Lievels prescribed in Chapter 40D-8. F.A.C.. are used as

20 a basis for imposing limitations on withdrawals of water and the design and construction

21 of surface water management systems. ":rtain other ot--vitic3. These limitations are



DECEMBER 12, 1997 BOARD DRAFT 8-2









1 prescribed in this and other chapters pafte of the rules of the District- as specified in Rule

2 40D-8.031(3). F.A.C.

3 Specific Authority 120.54. 373.016, 373.023, 373.044, 373.103 FS. Law Implemented

4 373.026, 373.042, 373.044, 373.086 FS. History New 6-7-78, Amended 1-22-79,

5 Formerly 16J-8.01. Amended

6 40D-8.021 Definitions.

7 The terms set forth herein shall have the meanings ascribed to them unless the

8 context clearly indicates otherwise, and such meanings shall apply throughout all District

9 tese rules. To "''facilitate easier reference, certain terms dOf by applicable statute have

10 boon included verbatim with appropriate citation. The terms defined in Rule 400-

11 1.102.F.A.C.. 49D-90.92 shall also apply throughout Chapter 40D-8. F.A.C.

12 (1) "Guidance Levels" Levels, determined by the District using the best available

13 information and expressed in feet relative to National Geodetic Vertical Datum, used as

14 advisory information- including for the District, lake shore residents and local governments

15 or to aid in the control of adjustable structures. For lakes for which levels were adopted

16 on or after September 9. 1997. Guidance Levels include: Ten Year Flood WaRmin' Level:



18 -7 An ...i L.! P A and Low Guidance

19 Level: and Po--modification Annual L-- Leve. For lakes for which levels were

20 adopted before September 9. 1997. Guidance Levels are the Ten Year Flood Wernin,

21 Level, the High Level Annual Flo-d" ""uid.nc L,. the Low Level, and, if adopted for

22 the lake. the Extreme Low Level.

DECEMBER 12, 1997 BOARD DRAFT 8-3










1 (2) "Long-term" An evaluation period used in assessing the status of water levels

2 withdrawal impa)et through modeling or statistical data analysis that represents a period

3 of time of sufficient length such that the evaluation period is insensitive to temporal

4 tnstable fluctuations of the variables utilized in the assessment e.g.. changes in

5 withdrawal rates., and hydrologic conditions, in order to simulate steady state conditions.

6 This will vary because professional judgement is necessary to establish the parameters

7 to be used in the assessment of each application depending on the hydrogeology and

8 climate of the area. of withdrawal the depth of and" -- -n of -" a"- th 'tIty

9 to be-withdrawn. As a guideline, a six year evaluation period will be used.

10 (3) "Minimum Flow" means the lonq-term level of flow for a surface watercourse

11 at which further withdrawals would be significantly harmful to the water resources or

12 ecology of the area.

13 (1) "Management range" mn th difference b n th tablihd minimum

14 watIr levels and minimum fogCd levels, and rlgprse %nt the capability of an impoundmentAII L




17 mngem...nt practices


18 (45 f-) "Minimum water Level" means the long-term level of surface water water

19 table, or potentiometric surface at which further withdrawals would be significantly harmful

20 to the water resources of the area. Such level shall be expressed as an elevation, in feet

21 relative to National Geodetic Vertical Datum of 1929. above moan sea level, and -ma

22 incrpC.rate a low management level and n extreme low management level, which

DECEMBER 12,1997 BOARD DRAFT 8-4









I together establish the lower limits of the management range, to which a water body shall

2 allVowed to fluctuate nature lly.

3 (5) "Management Range" means, for those lakes with levels adopted on or after

4 September 9. 1997. the difference between the applicable Annual Low Guidance Level

5 and Annumue Hieh High Guidance Level pursuant to Rule 40D-8.603. F.A.C. For lakes

6 with levels adopted prior to September 9. 1997. management range means the difference

7 between the High Level and the Low Level, or Extreme Low Level, if adopted for the

8 lake.. -ndt Annual f lood L vel

9 (3) "Minimum flood level" means the highest lcvel to which a surface water body

10 shall b i allow Vd to fluctuate without intererence xo pt aI approved by the Board for the

11 purpose of cons.., ing the waters in the State 0,,,,, as to realize their full beneficial ua. Sc

12 lovol shall b expr.essed a. aIn c.,levation ,v, in fit abo,.ve mean sea level.

13 (4) 'Ten (10) ye1 owa fla Arning levml" means that elevation in fcet above sea level,

14 which approximates thI levels o1lf flooding expected on a frequency M41 I Iof not lel th the- ten

15 (10) year recurring interval, or on a frequ ncy of not greater than a ten p rcnt0 I %)



17

18 -(5) "Best suace water management practice" in thc design, construction, operation,









DECEMBER 12,1997 BOARD DRAFT 8-5
18










1 -(b) Preoventioa of damage from floods, oil erosion, and excessive drainage.

2 C i) PreervatIIIn If natural rsourcs, fis11h,1 and wildlifeI .

3 -(d) Storage for aquifer recharge.

4 () NnIV-consumptive uses, includI lng butll In mited toII naavigationI, Icreaton, and

5 estheties.

6 Specific Authority 120.54. 373.016, 373.023, 373.044, 373.103 FS. Law Implemented

7 373.016, 373.042, 373.044 FS. History New 6-7-78, Amended 1-22-79, Formerly 16J-

8 8.02. Amended

9 40D-8.031 Implementation.

10 (1) The provisions of Chapter 40D 8 of these rules shal! continue to be implemented

11 a0 s of May 2,1078, 1 0 within the Hillsborough River, Northwest Hillsborough, CIrMen Swamp,

12 Alafia River, Coastal Rivers, Manasota, Peace River, Wim*thlacoochee Rive-ar and Pinellas



14 annCxed iinta the District by Chapter9'in 7865, Laws oif Floridai, and shall apply as follows:

15 (a) Management levels of la4es and other impoundments as prescribed hremn shall
13 J-11 I0I L I IV %of &RAI o %A %,fi V % 41 fO Ifgt ol 1%I S l, %0%4I6V l I I %ll I 11 11611 I %IVW I VV Sl I IN11 I ll l%--





16 become effective immediately upon:

17 *m1. Installation of a staff gauge in a prominent location l on the water body;i

18 llll2. Posting of notice tIll the public pursuant to Rule 40D 8.616; andI

19 I. Publication of notic I in a newspaper having generlIIa Im nal circulation within the affected



21 b IFItlI I 1 VIIVelow management level I lV M!as adjusted by the cyclic variati n shall

22 "become effective whe'n similar notice; has been given.-
DECEMBER 12,1997 BOARD DRAFT 8-6
A 7Ano&Ofe.









1 (1 -2) No Guidance eneageme*nt Lievels shall be prescribed for any reservoir or

2 other artificial structure which is located entirely within lands owned, leased, or otherwise

3 controlled by the user, and which require water only for filling, replenishing, and

4 maintaining of the water level thereof, provided however:

5 (a) No change.

6 (b) That the High Level or the High Guidance Level "Pre -m'difictn:- "--

7 Modication A..l. .i ic ,,m flood lev"l pur uant to Rulo3 40DI

8 8.021 W-nd ,4-8.6,11 ,a ahe ,Tena Year a-,,Fo,, "a -,ea -,,o as deter ined

9 pursuant to the procedures set forth in Part I of the District's =.ake-'evet Methodology

10 Manual incorporated by reference in Rule 40D-8.091. F.A.C.. pu-ruant to Rules 40D 8.021

11 and-40D-8.613 may be established for any lake or other: imp ndment determined by the

12 Board to be in the public interest.

13 (2} -3) No Guidance mnagemen. t LUevels shall be prescribed for Lake Manatee in

14 Manatee County, Ward Lake in Manatee County, the City of Tampa Reservoir on the

15 Hillsborough River in Hillsborough County, and the Peace River/Manasota Regional Water

16 Supply Authority Reservoir Cenorl Development Utilitie Reroir contru ted in



18 750001, 74 17, and "5 20 in DeSoto County.

19 (3) New water use or surface water management activity shall not cause an

20 established Minimum Flow or Level to be reduced or suppressed. In addition, the effects

21 of around water withdrawals shall not be considered in the design of surface water

22 management systems permitted under Chapters 40D-4. 40D-40. or 40D-400. F.A.C. The

DECEMBER 12, 1997 BOARD DRAFT 8-7









1 manner in which the Minimum Flows and Levels established in this Chapter 40D-8. F.A.C..

2 are implemented in the District's Consumptive Use and Environmental Resource

3 Permitting Programs is described in Rule 40D-2.301.F.A.C.. and Section 4.3 of the Basis

4 of Review described in Rule 40D-2.091. F.A.C.. and Sections 3.2.2.4 and 4.6 of the Basis

5 of Review described in Rule 40D-4.091. F.A.C.

6 (4) Where the eetuea long-term flow or level of a water body is below the Minimum

7 Flow or Level, pursuant to Section 373.0421(2). F.S.. the District shall exDeditiously

8 implement a recovery strategy with the intent to achieve recovery to the established

9 Minimum Flow and Level as soon as practicable. Where required by law. the portion of

10 the recovery strategy containing criteria that must be met by permittees and applicants

11 under Chapters 40D-2 and 40D-4. F.A.C.. shall be adopted by rule. The entire recovery

12 strategy shall be contained in the District's applicable Regional Water Supply Plan for the

13 area. and the District's Water Management Plan.

14 (5) The District shall annually update the Governing Board regarding the status of

15 the water levels for those water bodies for which Minimum Flows or Levels have been

16 established, and. where appropriate, the Governing Board may. through rulemakina.

17 change the status reflected in the tables set forth in Rules 40D-8.624 and 40D-8.626.

18 F.A.C.

19 (6) Establishment of a Minimum Flow or Level shall not be deemed to be a

20 determination by the Governing Board that any quantity above the established Minimum

21 Flow or Level is available for allocation to consumptive uses. For example, the District



DECEMBER 12, 1997 BOARD DRAFT 8-8









1 may by regulation or order reserve such quantities as it deems necessary pursuant to

2 Section 373.223(3), F.S.

3 Specific Authority 120.54. 373.016, 373.023, 373.044, 373.103 FS. Law Implemented

4 120.543, 373.016, 373.023, 373.042. 373.0421. 373.044, 373.086. 373.103 FS. History -

5 New 6-7-78, Amended 10-16-78, 1-22-79, Formerly 16J-8.03, Amended 3-23-81,

6

7 40D-8.041 Minimum R4.te'e F lowAs endLevels

8 (1) Minimum Flows For the Lower Hillsborough River

9 (a) For the purposes of Minimum Flows, the Lower Hillsborough River is defined as

10 the river downstream of Fletcher Avenue. The Lower Hillsborough River includes Sulphur

11 Springs, an artesian spring that enters the River via a short spring run located 2.2 miles

12 downstream of the City of Tampa's dam Hill'.broug" River...

13 (b) The Minimum Flow for the Lower Hillsborough River at the base of the City of

14 Tampa's dam shall be ten (10) cubic feet per second (cfs) when the surface water

15 elevation at USGS gauge 02304500 is at or above 20.0 feet NGVD and 0.0 cfs when the

16 surface water elevation is below 20.0 feet NGVD. This Minimum Flow has been

17 determined based on the structural alterations in and along the River and the dependence

18 of viable ecological communities downstream of the dam with flows from the Hillsborouoh

19 River Reservoir and Sulphur Springs. The City of Tampa may meet this flow requirement

20 by diverting flow from Sulphur Springs or the Reservoir. The required flows will become

21 effective January 1. 1999.



DECEMBER 12, 1997 BOARD DRAFT 8-9









1 (c) The District will establish a Minimum Flow for Sulphur Springs in the future. As

2 part of that process the District will evaluate if additional flows from Sulphur Springs are

3 available to supplement the Minimum Flow for the Hillsborough River at the base of the

4 City of Tampa's dam.

5 (2) Minimum Flows for the Tampa Bypass Canal

6 (a) The Tampa Bypass Canal extends 12 miles from above Fletcher Avenue to

7 McKay Bay. Structure 160 serves as the barrier between the freshwater and tidal portions

8 of the Tampa Bypass Canal.

9 (b) The Minimum Flow for the Tampa Bypass Canal at Structure 160 is 0 cfs. This

10 Minimum Flow accounts for the structural nature of the Canal. its operational constraints

11 and the relationship of ecological communities in the tidal reaches of the Canal and McKay

12 Bay with freshwater flows through Structure 160.

13 (c) The Minimum Flow for the Tampa Bypass Canal at Structure 160 is established

14 specific to the physical configuration and operations constraints of the Tampa Bypass

15 Canal as they exist at the time of adoption of this Minimum Flow. If substantial physical

16 modifications to the Tampa Bypass Canal are made. the District shall reevaluate the

17 Minimum Flow at Structure 160.

18 (1) In ..t.bli.hing minimum rate of flow and level' and regulatory level- the Board



20 xi..ting, w...ll a future .... onsumptive uses of water so s to promote the onser ation,

21 development and proper utilization of water while preventing dam-ge from floods, soil



DECEMBER 12, 1997 BOARD DRAFT 8-10










I and levels may bc established to reflect seasonal or cyclic variations. The Board will also

%l2 consider, and at %Lits discretion may provide for, the protection of nonIifl iem1consumptive useU,1

3 including navigation, recreation, ap;d the preservtion of natural resources, fish, and





6 at given point on a stream r other watrcourse shall be established by the Board for
4 ""c'. e ii



GAL I lVj li to I ,1 19,,,ILA .I UI %0 1A I1%1 W I I1 IL*i WV O *I& .1 14ll im %moJll4l&1l%,l I &1 I LiI. S.O !l .4%A ,

7 each month, January through December. Minimum rates of flow shall bo established as

8 follows: For each month, the five (5) lowest monthly mean discharges for the preceding

9 twenty (20) years shall bo averaged. Minimum rates of flow shall be established as

10 seventy p.,, rcent (70%) cf1 t he si e values for the four ,,'(4) wettest months and ninety p., percent



12 basA.d on available data, or in the absencee of such data, t shall be established by

13 rCascnable calculations approved by the Board.














20 l(4) Unlcllss othIrv ls deomd appropriate by the Board, a regulatory levl for a

21 co.finEd aquifer at a given point shall bo established generally to mLimit the rate
122 movmnt of wat. r from the water table at th boundary of the land owned, leased, or




DECEMBER 12,1997 BOARD DRAFT 8-11
Ad









I otherwise controlled by n anpplizant for a cnsumptivz use permit or at the boundary of
on e. I % I L A I W 6A .. .. I1 A A AW WLIA WWIWI III WA I I A L... I WI W .0WWI1 % %A Pe I 1.... 3y 'q b

2 n equivalent ,area based on thc ,onfigurati,- n o- f thz cone of d C.pression c-used by th

3 Wpropose2d location and oaiperatioin of the wll or wells.

4 (a) SuCh regulat-ory level shall be daotzrmin ed by taking tha minimum level of thc




7 tabl to the confined aquifer. ,SuCh hed different is the water crop divided by the,


8 lakane CoeffiCamient of the confining bed. The water 4 ac=u rop, in the absen e of data toa the

9 Contrary, s 0.022, 568 gallons per day per square foot.

10 ---(b) The elevation of the potentiometrio surface at suoh point shall be meosured
la I AlI 16IJI% 15=4W WL ll4 I% 1 I I 1WLWil0I I;%9_4 0611%.0 VWU.4LCL ljlllI IWPI .# L11












12 ,..,,rage el, ...vation be lowe.,;r .,than tho. rIgulat4,ory ,ev.l ,nd at no time shall th weekly

13 average elections of the potntimtri su e of the oridn Aquifer be more than five

14 4fe"t (5') below the r.....'gulatory level..

15 Specific Authority 120.54. 373.044, 373.133, 373.149, 373.171 FS: Law Implemented

16- 373.042, 373.086. 373.339 FS. History Readopted 10-5-74, Amended 12-31-74,

17 Formerly 16J-O. 15, 40D-1.601, Amended 10-1-84. .

18 40D-8.091 Publications Incorporated By Reference

19 The determinations of Guidance '"-'- Lv "-"- l"udi t .... on- -- ow..

20 LeAeI i and Minimum Lake Levels. Minimum Wetland Levels, and Minimum Aquifer

21 Levels set forth in Rule 40D-8.603. 40D-8.624. 40D-8.625. and 40D-8.626. F.A.C.. are

22 more particularly described in the District's a-ke--deved Methodology Manual. dated

DECEMBER 12, 1997 BOARD DRAFT 8-12









1 September- 9I97, which is hereby incorporated by reference into this Chapter and is

2 available from the District upon request.

3 Specific Authority 120.54. 373.016. 373.023. 373.044. 373.103. 373.113. 373.133.

4 373.149. 373.171 FS. Law Implemented 120.54. 373.016. 373.023. 373.026. 373.0395.

5 373.042. 373.0421. 373.044. 373.086. 373.103. 373.171. 373.339 FS. History New

6

7 40D-8.603 Meaigement Guidance Levels for Lakes -"and Other i mpundment .

8 (1) Guidance Levels adopted by the Governing Board on or after September 9.

9 1997. and the method for calculating those Levels are set forth in Rules 40D-8.603(*k and

10 40D-8.625(3). F.A.C. Guidance Levels adopted by the Govering Board prior to

11 September 98, 1997. are listed in Rule 40D-8.625(3)46. F.A.C.

12 (2) Feed-and-Hiqh Levels

13 (a) The Ten (10) Year Flood Warning Level is provided as an advisory guideline

14 for lake shore development. The Ten (10) Year Flood Wamin Level, incorporates the

15 level of flooding expected on a frequency of not less than the ten (10) year recurring

16 interval, or on a frequency of not greater than a ten percent (10%) probability of occurrence

17 in any given year. The Ten Year Flood Warning Level is calculated as described in

18 Chapter Two. Part I,. of the District's LIeke-Level Methodology Manual described in Rule

19 40D-8.091. F.A.C.

20 (b) The High Guidance Level is the elevation that the lake level is expected

21 to equal or exceed ten percent of the time on a long-term basis. The-Pre-



DECEMBER 12, 1997 BOARD DRAFT 8-13










1 expecte..d "utut an an .vera.e ann-al ha The -A ur

2 High High Guidance Level is calculated using the methodologies as described in

3 Chapter Three and Four of the District's Lke evel Methodology Manual. described in

4 Rule 40D-8.091,F.A.C.











53 ( ) The j-md -if- A l guidance .level is the elevation th with lat the
15 iarcent of the time on a lonli-teln basihe










16 Low Guidance Level is calculated using he methodologies described in the Chapter


17 3 and 4 of the District's Methodology Manual described in Rule 40D-8.091. "-
13 I1 momI Pr--moIIcation D neaf llowIpN GAidanc Level is the ele It tIlgle olllhe















21 ---ere ---- -- .... u ... a .. av ..


221 0tct Lk --l. M MI... 'cr. in5 .0 .A.

DECEMBER 12, 1997 BOARD DRAFT 8-14









1 nnmboon n N nn,Ing.",lened., logy ,, ue activities end hichl, me lon n ner full e -

2 mod-aifi cation. f Inl.-- Pot--mI-- ctiovowe.. An l -w- lovo may ---be e--- --A

3 o muido op o lake calsontro"l -tructurmm for themo llkper witalh oromanrl aim r-etror


54 A ei P re:A iAieAlto I "Ism I v l-. i ....i Q- e %iA in Cip t rJl4 aiA


6 (3)(4) Posted Notice

7 (a) Staff gauges will be installed in prominent locations on each lake for which

8 Guidance Levels or Minimum Levels have been established. A notice shall be posted in

9 the immediate proximity of the staff gauge indicating that Levels have been established.

10 (b) The notice shall indicate the elevations of the Guidance Level(s) and the

11 established Minimum Level(s).

12 (4)f5- Renaming of Levels

13 (a) Lakes for which lake levels were adopted prior to September 9. 1997. had what

14 were referred to in the District's Rules as management levels and alternatively as minimum

15 levels. These levels were the Ten Year Flood Warning Level, the Minimum Flood Level.

16 the Low Management Level and for some lakes there was an Extreme Low Management

17 Level. As of (effective date of these proposed rule revisions) these levels are now referred

18 to as the Guidance Levels. For those lakes with levels established prior to September 9.

19 1997. the Minimum Flood is now named the High Am,ul Fleed Level, the Low

20 Management Level is now named the Low Level and the Extreme Low Management Level

21 is now named the Extreme Low Level.



DECEMBER 12, 1997 BOARD DRAFT 8-15










1 (b) For lakes for which levels were adopted before September 98. 1997. a reference

2 within the District's rules to the applicable minimum level or to established minimum water

3 levels shall refer to the Low M neaement Level, or. if adopted for the lake. the Extreme

4 Low Manaeemnent Level. Those lakes for which levels were adopted prior to September

5 9. 1997. Auttut--499 are set forth in Rule 40D-8.625(3)4(-i. F.A.C.. along with the

6 adopted levels.

7 (c) For lakes for which levels were adopted on or after September 9. 1997. a

8 reference in the District's rules to the applicable minimum level or to established minimum

9 water levels shall refer to the adopted High Minimum Fleed and Minimum Level

10 described in Rule 40D-8.625(3)4f F.A.C.

11 (1) In eitabliahing minimum water levelp minimum flaad level and other
11 1 91,1 TV vM4%%ll llryI I#il i 1 1 1 I- %0I-1 %-a "I %AsUII li= IwwA .i I G0 %4llAl%

12 management lev'e..l. far lakc .and ather impo. ...aundment., the a.crd hall u.e the bc.at

13 -infrmati" n avai.able.-

14 Ij IO",Ii IiWIII Iw l %0%41- V ^UY.lllFl






20 marks, w -tland veget:at-ion, and dr land vegetation, and to estabr-lish the elevation of spti
15.,,#% Alkr...4 I %%.OP I ,. 7 141I I 101%aL%.%A 10lPlAlI1 I I I I % I I %.o %00 1 % l W I 1 1164 ,w% I v % Olol me % 09.II 1 1 II 1 1MAY IAI i











21 tanks, docks, sea walls, roads, and floor slabs and to sAcure other pctincnt information.
18 12,1997 BOARD DRAFT 816









DECEMBER 12, 1997 BOARD DRAFT 8-16










1 Specific Authority 373.016, 373.023, 373.044, 373.103 FS. Law Implemented 373.016,

2 373.042, 373.044, 373.086 FS. History New 6-7-78, Formerly 16J-8.672. Paragraphs

3 (2)(h) and (I) Formerly 16J-8.6721. Paragraph(4) Formerly 16J-8.673. Amended

4

5 40D-8.605 Cyclic Variations for Minimum Water Level

6 i (1) ThIe elevatin of th minimum watrIIIII lvl eStablihed fIor a lk0 VIor1the

7 impoundment hall be lCwered below the IW management level periodically tC allCw



9 lprtctioi n of nntl--onumptive t. I The liwredW lovl i d gated the I I Iextreme low

10 manager ent l ve.

11 (2) The low managem nt levl hall be the applicable minimum wat r lovel for a ucha

12 lake Cr other impCundment until four (4) conaecutivc yeor3 hove paaaed during which thC

13 actual wotor level haa failed to record to the extreme low management level; in which

,. ,,,, 2 a W,, O ,.,.., ,,,.,.,,%,, ,, ,,..,, ,,W a,,,,,,, h,,i ,,,,,, ,,, ,.., ,.,, ,,,, ., ,,
14 ovent the extreme low management level ohall become the applicable minimum water levl



16. extreme low management level. Whenever the actual water level receded to or below the
17 extreme lw mai nagement level, the applicable minimum water level for the lake or .ther
18 impoundment DL% hall immediately be r1ied oncI again tC the lw management leve l and




20 Specific Authority 373.016, 373.023, 373.044, 373.103 FS. Law Implemented 373.016,

21 373.042, 373.044 FS. History New 6-7-78, Formerly 16J-8.671. Repealed

22

DECEMBER 12, 1997 BOARD DRAFT 8-17










1 40D-8.611 Minimum Flood Levels

2 (1) Th minimum flood I I l indicates the1 minimum Im leve l to which high water mayI II I VV

3 b expctcd to rise on aQ somewhat regular basis and will not necessarily correspond to

4 any particular flood frequency. Flood waters may often rise above thc minimum flood level.

"5 I(2) Docks, sea walls, septic tanks, drain fields, floor slbs, 84and other physical



7 av e been established, should be so located and constructed tha t their function will 1not b



9 (3)j No structure, improvement, or device shall b constructed or operated in suchII

10 a manner as to dim finish the capability of a lake or tcrothe impoundment to fluctuate through

11 the full management range established for such impoundment.

12 il(4) Propelry owners are hereby advised that compliance with District Rules and

13 Regulations does not relieve owners of the responsibility of complying with other



15 %fthe National FloodI I insurance Program.1 I

16 Specific Authority 373.016, 373.023, 373.044, 373.103 FS. Law Implemented 373.016,

17 373.042, 373.044 FS. History New 6-7-78, Formerly 16J-8.672. Repealed L .

18 40D-8.613 Ten (10) Year Flood Warning Levels.



20 statement for the public interest. Prope..r.y owners, public officials and the general public

21 ar advised that flooding on a frequency of not lss than a ton (10) year recurring interval



DECEMBER 12, 1997 BOARD DRAFT 8-18










I is cxpccted to occur at the indicatod elevation. Flood waters may oftcn rise abcve tho flatd
I. A O eetfl I .Pi10. t .I I6.L II Iffil%.i 211600i-# 1I. I I2l TVVi.i l %a /IC A I I I I O J 1i III1%0 //%W

2 weri ng- lve-l

3 --(2) Floor slabs, septic tanks and drain fields, docks, sea wall and other physical



i5 hav. bon established, should be sc locate anld constructed su" efficiently above thel i I fld
IIIAV%. o I, V lla wl D & I I% .,I IWY Ial rr I l %xO % .P% IO-OA&ir I MN%=a l%.40 L li I%./i %iOl I1%0101 I I % 46-0% 0V%04 V LD I r 1%0 V1



6 warning lveCl uch tht their functioU 1.,ns will nLt bC, impaired by the rising water.

7 Specific Authority 373.016, 373.023, 373.044, 373.103 FS. Law Implemented 373.016,

8 373.042, 373.044 FS. History New 1-22-79, Formerly 16J-8.6721. Repealed

9

10 40D-8.616 Posted Notice.

11 1 (1) Staff gauges will be II ntal Ied in prominent locations n e11h lake Ir other

12 impoundment for which a management range hs ben estACblishecd. A notice shall be

13 posted on the immediate proximity of the staff gauge indicating that management levels

14 have been established.

15 1(2) The notice shall indicate the elevations of the minimum flood Ievel and the








19 ___
16 "--':""' '" '-':-:O .... ... ''"'"'

17 Specific Authority 373.016, 373.023, 373.044, 373.103 FS. Law Implemented 373.016,






20 40D-8.621 Operating Levels for Lakes, and Other Impoundments with District-

21 Owned Control Structures.



DECEMBER 12, 1997.BOARD DRAFT 8-19










1 (1) Schedules, levels, and procedures for operation of lakes with a District-owned

2 control structure an" '"ther impundmn "-t equipped with atructur: shall be established

3 by the Board.

4 (2) The operating range for a structure of a lake or other impfndme nt shall be

5 prescribed as that between the high operating level and the low operating level.

6 (a) High operating level shall be established by the Board in consideration of the

7 Guidance Levels, public testimony and in keeping with the best lake control suIfeee-weter

8 management practices.

9 (b) Low operating level shall be established by the Board in consideration of

10 Guidance Levels, any applicable Minimum Level, public testimony and in keeping with the

11 best lake control sufeOaze wter management practices.

12 (3) Best lake control management practices in the design, construction, operation.

13 and maintenance of structures or devices requires a consideration and evaluation of both

14 long-term and short-term effects of the activity upon the water resources of the District.

15 Factors to be considered include the following:

16 (a) Conservation and proper utilization of surface water.

17 (b) Prevention of damage from floods, soil erosion, and excessive drainage.

18 (c) Preservation of natural resources, fish and wildlife.

19 (d) Storage for aquifer recharge.

20 (e) Non-consumptive uses, including but not limited to, navigation, recreation, and

21 aesthetics.

22 (f) Compliance with any Minimum Level established for the lake.

DECEMBER 12, 1997 BOARD DRAFT 8-20










1 (4) (-3) A prescribed schedule for operation of all lakes and other impu ndmnt,, with

2 structures shall be established by the Board. The schedule will contain time sequences by

3 which the levels of the water body will be maintained throughout the established

4 management range. While recognizing the difficulty of maintaining precise control of actual

5 levels, the schedule shall provide the guideline by which the operator of the structure will

6 attempt to maintain the prescribed levels insofar as he has control.

7 Specific Authority 373.016, 373.023, 373.044, 373.103 FS. Law Implemented 373.016,

8 373.042, 373.044 FS. History New 6-7-78, Formerly 16J-8.677. Amended

9

10 40D-8.624 ehedule & ef Establishment of Minimum Levels for Lekes- an

11 Wetlands A-nd Other I' .mpoudme .

12 (1) Levels for lAkes And other impoundments are hereby established as
12 1 1 5.1c~..0 I %011 IP 1% I %41 .#% %0465 I5.,Vl I%45 6I045 INO5 5b% 45 AMP5 5%5.

13 f--l, vlIa Establi sh mnt of, IRim 1 Wl-,, d .-Lve--sa) Where a Minimum Level for

14 isolated, cypress dominated wetlands is established and incorporated into the table at Rule

15 40D-8.624(3). F.A.C.. below, the Minimum Level shall be that level which is 1.8 44 feet

16 below a reference elevation referred to as the normal pool elevation. Wetland water levels

17 are deemed to be below the Minimum Level when the long-term median stage is below

18 the Minimum Level based on six (6- yar monitoring period.

19 (b) The normal pool elevation shall be determined based on a consideration.

20 utilizing professional judgement, of biological indicators of sustained inundation such as:

21 1. The lower limit of epiphytic mosses and liverworts intolerant of sustained

22 inundation:

DECEMBER 12,1997 BOARD DRAFT 8-21










1 2. The upper limit of the root crown on Lyonia lucida growing on tree tussocks:

2 3. The upper limit of adventitious roots on Hvpericum fasiculatum and other species

3 which exhibit this morphologic response to sustained inundation:

4 4. Other indicators which can be demonstrated to represent a similar period of

5 sustained inundation.

6 (2) Wetlands within Hillsborough County north of State Road 60 and Pasco and

7 Pinellas Counties for which Minimum Levels have been established as set forth in the table

8 in Rule 40D-8.624(3). F.A.C.. below were selected based upon the wetland meeting the

9 following guidelines. Although these selection criteria were used to identify the initial group

10 of wetlands to be monitored, additional wetlands may be chosen over time which do not

11 meet these criteria.

12 (a) located in an area that is or may be experiencing adverse water withdrawal

13 impacts:

14 (b). isolated cypress dome greater than 0.5 acres in size:

15 (c) District's ability to enter property on a long-term basis for instrumentation and

16 monitoring of the site:

17 (d) wetlands with monitoring data are preferred: and

18 (e) that there appears to be minimal structural alterations and changes, other

19 than those caused primarily by water withdrawals, that have affected the wetland.

20 (3) Minimum Levels for wetlands are hereby established as set forth in the following

21 table. Those wetlands for which the Minimum Level elevation is followed by an

22 asterisk (*). it has been deemed that upon the effective date of the rule adopting the

DECEMBER 12, 1997 BOARD DRAFT 8-22










1 Minimum Level for those wetlands, the wetland level is below the Minimum Level.

2 Wetland may be presumed to be below the minimum level, even if sufficient long-

3 term hydrologic data is unavailable, if:

4 (a) analysis of other information, such as aerial photography or biological

5 indicators indicate the wetland is adversely affected to a degree that is similar to

6 other wetlands which are below the minimum level, and

7 (b) other wetlands in the proximity are below their minimum level as a result

8 of around water withdrawal.


19 MIf rin-ufici'n d't cxit t t i f w ld I "M tr1 C A'vll[ in Al t



17 wur Mlc#%n i mu Wetand Laev bbelswl te M u Lep ptmbr ad on9
12 %V .Al tio n .. ..I photoIrphp and %.Cv. loi ..n of bioll -I 855 %-a aT

13 al xi n IcRWIN 100 Ingl. I. I u..... Ioa. v....r.S athn rovel. seero.. I t.nL.r h

16 Gov.,,i-, ,,,,, or, pbliha.--,.,,t ,,,,. Ifo -l, adopion %ior %o Oc %F. 1, 999
14 :.- ,f -re "':- -" .... "e-" .... "'- :-- e ":-"- "- --0"--- "%T





17 Minimum Wetland Levels Ap--ve ...... 01 o, ,-- ,1007,%

18 Wetland Site Minimum Level Latitude Longitude
19 (a) CC W-41 73.2 28 18 44 82 22 25

20 (b)CCW-11 67.6 28 17 46 82 23 6

21 (c)CCW-12 62.2 281733 82 23 39
22 (d)CCW-17 63.2 2817 8 82 23 41


DECEMBER 12,1997 BOARD DRAFT 8-23
13<










1 (e) CC Site G 62.8 281621 822418
2 (f) STWF D 29.2 281519 82 38 5

3 (g) STWF Central 43.4 28 1440 82 3545

4 Recorder
5 (h) STWF Z 40.1 281410 82357
6 (i) STWF Eastern 44.7 281445 823356

7 Recorder
8 (j) STWF S-75 45.5 28151 823346
9 (k) STWF M 43.1 281434 823424
10 (I) STWF N 45.2 281433 82338
11 (m) MBWF Entry 33.8 28 6 55 821824

12 Dome
13 (n) MBWF X-4 40.7 28 7 26 82.2014
14 (o) MBWF Clay 39.9 28 7 21 822045

15 Gully Cypress
16 (p) MBWF 32.3 28 6 20 822033

17 Unnamed

18- (q) EWWF NW-42 27.1 28 9 21 82 39 47
19 (r) EWWF NW-44 36.8 2810 5 82 37 52
20 (s) EWWF Sails 19.9 29 10 3 82 40 58

21 Property Wetland

22 10S/10D
23 (t) SPWF NW-49 57.5 28 11 0 82 30 27




DECEMBER 12, 1997 BOARD DRAFT 8-24










1 (u) SPWF South 57.6 281053 82 30 29

2 Cypress
3 (v) SPWF NW-50 57.4 2811 17 823028

4 South Pasco
5 (w) S21 WF NW-53 51.6 28 7 16 823051

6 East
7 (x) Cosme WF 39.6 28 6 2 823527

8 Wetland

9 (y) CBARWF TQ-1 73.3 282037 822911

10 West
11 (z) CBARWF T-3 68.9 282052 822944
12 (aa) CBARWF Stop 72.4 282037 822828

13 #7
14 (bb) CBARWF Q-1 72.8 282046 822811
15 (cc) CR1 87.0 28 7 57 82 7 16
16 (dd) CR2 90.6 28 7 14 82 7 11
17 (ee) CR3 95.5 28 6 39 82 7 14
18 (ff) CR4 99.1 28 6 50 82 5 54
19 (gg) CR5 105.3 28 5 53 82 4 56
20 (hh) CR6 96.1 28 7 32 82 5 57
21 (ii) NPWF #3 44.5 28 19 0 82 34 32

22 (jj) NPWF #21 44.6 28 17 23 82 34 30


23 40D-8.625 Establishment of Lake Levels



DECEMBER 12, 1997 BOARD DRAFT 8-25










1 (1) Levels for lakes established on or after September 9. 1997 are set forth in

2 the table in 40D-8.625(3), F.A.C. There are two Minimum Levels for lakes, the High

3 Minimum Level and the Minimum Level. The High Minimum Levels and the Minimum

4 Level are calculated using the methodologies described in Chapters Three and

5 Four. Part I of the District's Methodology Manual described in 40D-8.091.

6 (a) The High Minimum Level is the elevation that the lake level is required to

7 equal or exceed ten (10) percent of the time based on long-term fluctuations. It is

8 calculated by subtracting an offset from the High Guidance Level as described in

9 Chapters Three and Four. Part I of the District's Methodology Manual described in

10 40D-8.091.

11 (b) The Minimum Level is the elevation that the lake level is required to equal

12 or exceed at least fifty (50) percent of the time based on long-term fluctuations. It

13 is calculated by subtracting 0.8 feet allowable offset from the long-term median lake

14 stage.

151 t im-il iP dVe med*mm, wn ,,,-U Io Icm Lto "& a M ini mu L .vml Auh m uth m 61 i ..

16 I I I # &1 % owd









21 A-(b Post-modiiction Lakes with as lIast sIcax no on Milm" of =%FAVArele
1622 ..- l,, ... .. .. um. n ,Oly. .v e..







DECEMBER 12, 1997 BOARD DRAFT 8-26
=l o =u=,l.. u= | wv.. .. =lm ,.. ,,vvw n mum .==-,v~ .w .# mY|im= U =m . f











2 cait..obliah. te I ot o d ifcatin ma'sL'.gl.. iff1 OSI HiahI an Low L Antto a CE

C A'.A .. Thia laikr. aevl elm ,,millU, 6g% bio belw hae i,,,.Mi m L0v l wheun him, 'lv Lati,
3 .A ivrlo a. ..I .... RRW ni 'ln n &vW- A 1.,. ,,0 6L ,, nmar:...: .,55 unI rr1v IU ....F O L.vol% ,,u% %05% V



5 Yal A ..t ix....v. pc3ed4



7 ul.kcuw..t:hLot6 i:x If if ear of hv LWaw ulodi : ll aic 6h. galo ear pacs o due a'-

u9 mo ........Ao An. ..V al Iah |my Low 0v%0l. dmvotion i 6if. tm in ,u
12 ...:n..n.-.. .. 1..n n ....AN..n A a:...I. .D.n ..--: 6 -..M....AN .... AL na....











13 s

14 :I.o If :i...wc N %... *na ni t .... n ..Ln.... i: h0L._ L k l...... la- ...a i.... b

15 i:i L...n..... l ... to .. ...l 4 D.. : .. 6 nA.... n ..: ... ... nb ..._ th ... lk le l

16 V %11v.... I +
17 simillr ldkes bU ugeof aIv istoeraphs ,- -valti onf ei llo imloam, go is ande .t..






18 (2)a5) Within Hillsborough and Pasco Counties. Minimum Levels have been

19 established on Lakes Barbara. Big Fish. Cypress. Dosson. Helen. Ellen. Little Moon.

20 Rainbow and Sunshine based on the Priority Schedule for the Establishment of Minimum

21 Flows and Levels within the District's Water Management Plan. dated March 1995. as

22 updated June 1996. Minimum Levels have been established on Lakes Alice. Bird.

DECEMBER 12, 1997 BOARD DRAFT 8-27










1 Brant. Calm. Church. Crenshaw. Crystal. Deer. Echo. Fairy (Maurine). Halfmoon.

2 Hobbs. Horse. Juanita. Merrywater. Rainbow. Ralieah. Rogers. Round. Starvation.

3 Stemper and Sunset based on their strategic location within the Northern Tampa

4 Bay area. the existence of the quantity and quality of data related to the lake, and

5 their good connection to the Floridan aquifer.Tho Minimum Leel. --taubliahed for-

6 4hhc I l a .hall hb .r .&ll Wa.d In G4ri = Ial Boor no I ----r han ....- ar --

7 1000. ,,, ca ohm"l ,.," expirlae o MUM 100.nl cac lel, i,.. mp,..



9 October.1-4999r

10 (3)f6 Levels for lakes and other impoundments are as set forth in the

11 following table. After the Minimum Level elevation for each lake an abbreviation of

12 SA or NSA is listed. The abbreviation indicates which of the methodologies

13 described in "u- 40-8. 624a(4) Chapters Three and Four. Part I of the District's

14 Methodology Manual described in Rule 40D-8.091. F.A.C.. was used to calculate the

15 Minimum Level. Guidance Levels established prior to September 9. 1997, are set

16 forth in Rule 40D-8.625(4). 4G6-8*"64(2=r F.A.C.. below. Those lakes for which

17 Minimum Level elevation is followed by an asterisk (*). it has been deemed that

18 upon the effective date of the rule adopting the Minimum Level for those lakes the

19 lake level is below the Minimum Level. If insufficient data exists to determine if the

20 lake level is below the Minimum Level, pursuant to Rules 40D-8.625(1) 409-8.-624(e

21 -'.e)r F.A.C.. above, the lake level can be determined to be below the Minimum Level



DECEMBER 12, 1997 BOARD DRAFT 8-28









1 based on a comparison with similar lakes by use of aerial photographs and

2 evaluation of biological indicators.

3 Location by Name of Ten -Amn High Am..tl Minimum

4 County and Basin Lake Year High- Minimum Low- Level

Flood- Guidance Level Guidance N"GVB)

-uidAnee Level Level

Level 'Cv' ,l,.,



5 (a) In Charlotte

6 County Within

7 The Peace River

8 Basin

9 RESERVED
10 (b) In Citrus

11 County Within

12 The Coastal

13 Rivers Basin

14 RESERVED









DECEMBER 12, 1997 BOARD DRAFT 8-29










1 (c) In Citrus

2 County Within

3 Ihe

4 Withlacoochee

5 River Basin

6 RESERVED

7 (d) In DeSoto

8 County Within

9 The Peace River

10 Basin

11 RESERVED

12 (e) In Hardee

13 County Within

14 The Peace River

15 Basin

16 RESERVED

17 (f) In Hernando

18 County Within

19 The Coastal

20 Rivers Basin

21 RESERVED




DECEMBER 12, 1997 BOARD DRAFT 8-30










1 (g) In Hernando

2 County Within

3 The Hillsborough

4 River Basin

5 RESERVED

6 (h) In Hernando

7 County Within

8 The

9 Withlacoochee

10 River Basin

11 RESERVED
12 (i) In Highlands

13 County Within

14 The Peace River

15 Basin

16 RESERVED

17 (i) In Hillsborough

18 County Within

19 The Alafia River

20 Basin

21 RESERVED




DECEMBER 12, 1997 BOARD DRAFT 8-31










1 1)In Stemper TBA TA TBA TBA 59.9*

2 Hillsborouah Lake

3 County Within S-13. T-27.

4 The Hillsborough R-18

5 River Basin

6 RESERVED
7 (1) In Hillsborough Sapphire 6 6 TBA 6

8 County Within the Lake TBA TBA ITBA (PMN)

9 Northwest S-14.T- TBA

10 Hillsborough 27.R-18

11 Basin
Cypress 49M 48.9 TBA 47

Lake TBA TBA TBA (PMNB)

S-24.T- TBA

27.R-17
Dosson 54 M TBA. 5

Lake TBA TBA TBA (PEM

S-20,T- TBA

27,R-18








DECEMBER 12, 1997 BOARD DRAFT 8-32










Sunshine 5j 2S& TBA -- 4

Lake ITBA TBA TIA (PMNB

S-20.T- TBA

27.R-18
Lake Helen 54 65 TBA 4

S-19.T- TBA TBA IBA (PMNB)

27.R-1 8 IBA
Lake Ellen 5 53 TIA 4 62

S-1 9T- TBA TBA TBA (PMN9)

27. R-18 IBA
Lake 541 53 TBA I

Barbara TBA TBA TBA (PMNI)

S-19.T- TBA

27.R-1 8
Little Moon 4j 39 TBA 37 38d

Lake IBA TBA TBA (PMNB)

S-28.T- IBA

27.R-17
Hobbs TBA TBA TBA TBA 63.5*

S-1. T-27.






DECEMBER 12, 1997 BOARD DRAFT 8-33










Brant TBA TBA TBA TBA 56,2*

S-23. T-27.

R-!8
Crenshaw TBA TBA TBA TBA 53.7*

S-22. T-27.

R-18
Starvation TBA TBA TBA TBA 50.7*

S-21. T-27.

R-18
Deer TBA ITA TBA TBA 64.7*

S-1. T-27.

R-18
Alice TBA TBA TBA TBA 40.8*

S-16. T-27.

R-17
Calm TBA ITA TBA TBA 48.6*

S-14. T-27.

R-17
Rainbow TBA TBA TBA TBA 37.3*

S-22. T-27.

R-17





DECEMBER 12, 1997 BOARD DRAFT 8-34










Juanita TBA TBA TBA TA 39.9*

S-22. T-27,

.16.1
Horse TBA TBA TBA TBA 45.1*

S-26. T-27.

R-17

Faiwr TBA ITA TBA TBA 33.0*

(Maurine)

S-34. T27.



Halfmoon TBA ITA TBA TBA 425*

$-31. T-27,

R18
Raleigh TBA TBA TBA TBA 417*

S-27. T-27.







R-17

Sunset TBA TBA TBA TBA 32.8*

S-17. T-27.

_R-17



DECEMBER 12, 1997 BOARD DRAFT 8-35










Bird TBA TBA TA A 47.8*

S-26. T-27.

R-18
Crystal TBA TBA TBA TBA 58.0*

S-14. T-27,

R-18
Merrvwater TBA TEA TBA TBA 54.0*

S-22. T-27

R-18
Round TBA TBA TBA TA 54.0*

S-22. T-27L

R-18
Church TBA TA TA TBA 355*

S-28. T-27.

R-17
Echo TBA TBBAA TA 35.5*

S-28. T-27.

R___ ________BR-17 ___________











DECEMBER 12,1997 BOARD DRAFT 8-36










1 (m) In Lake

2 County Within

3 The Green

4 Swamp Basin

5 RESERVED
6 (n) In Levy

7 County Within

8 The

9 Withlacoochee

10 River Basin

11 RESERVED
12 (o) In Manatee

13 County Within

14 The Manasota

15 Basin

16 RESERVED

17 (p) In Marion

18 County Within

19 The

20 Withlacoochee

21 River Basin

22 RESERVED


DECEMBER 12, 1997 BOARD DRAFT 8-37










1 (a) In Pasco Big Fish4 3 TBA 7 4

2 County Within the Lake TBA TBA IBA (Pd)

3 Coastal Rivers S-21.T- IBA

4 Basin 24. R-1 9
5 (r) In Pasco

6 County Within

7 The Green

8 Swamp Basin

9 RESERVED__
10 (s) In Pasco

11 County Within

12 The Hillsborough

13 River Basin

14 RESERVED
15 (t) In Pasco Camp Lake TBA TBA TBA IA 62.*

16 County Within S-34. T-26.

17 The Pinellas- -18

18 Anclote River

19 Basin

20 RESERVED






DECEMBER 12, 1997 BOARD DRAFT 8-38










1 (u) In Pasco

2 County Within

3 The

4 Withlacoochee

5 River Basin

6 RESERVED

I (v) In Pinellas

8 County Within

9 The Pinellas-

10 Anclote River

11 Basin

12 RESERVED
13 (w) In Polk

14 County Within

15 The Alafia River

16 Basin

17 RESERVED
18 (x) In Polk County

19 Within The Green

20 Swamp Basin

21 RESERVED




DECEMBER 12, 1997 BOARD DRAFT 8-39










1 (y) In Polk County

2 Within The

3 Hillsborough

4 River Basin

5 RESERVED
6 (z) In Polk County

7 Within The Peace

8 River Basin

9 RESERVED
10 (aa) In Sarasota

11 County Within

12 The Manasota

13 Basin

14 RESERVED _

15 (bb) In Sumter

16 County Within

17 The Green

18 Swamp Basin

19 RESERVED








DECEMBER 12, 1997 BOARD DRAFT 8-40










1 (cc) In Sumter

2 County Within

3 The

4 Withlacoochee

5 River Basin

6 RESERVED_


7 (4)f} Guidance Levels established for lakes prior to September 8. 1997. are set

8 forth in the following table:

9 TABLE OF LAKE LEVELS PREVIOUSLY ADOPTED HAVE BEEN OMITTED FOR

10 THIS DRAFT BECAUSE THE ONLY CHANGE IS TO THE NAME OF THE LEVELS AS

11 DESCRIBED IN 40D-8.603(5) NOT TO THE LEVELS THEMSELVES: EXCEPT THAT THE

12 FOLLOWING LAKES WILL BE REPEALED FROM THE TABLE BECAUSE NEW

13 LEVELS ARE PROPOSED AND INCLUDED IN THE TABLE AT 40D-8.626(3) ABOVE:

14 Alice. Bird. Brant. Calm. Church. Crenshaw. Crystal. Deer. Echo. Fairy (Maurine)

15 Halfmoon. Hobbs. Horse. Juanita. Merrywater. Rainbow. Raliegh. Rogers. Round.

16 Starvation. Stemper and Sunset.

17 Specific Authority 373.044, 373.113, 373.171 FS. Law Implemented 373.016, 373.042,

18 373.103 FS. History New 6-7-78, Amended 1-22-79, 4-27-80, 10-21-80, 12-22-80, 3-23-

19 81, 4-14-81, 6-4-81, 10-15-81, 11-23-81, 1-5-82, 3-11-82, 5-10-82, 7-4-82, 9-2-82, 11-8-

20 82, 1-10-83, 4-3-83, 7-5-83, 9-5-83, 10-16-83, 12-12-83, 5-8-84, 7-8-84, 12-16-84, 2-7-85,

21 5-13-85, 6-26-85, 11-3-85, 3-5-86, 6-16-86, Formerly 16J-8.678, Amended 9-7-86, 2-12-

DECEMBER 12, 1997 BOARD DRAFT 8-41










1 87, 9-2-87, 2-18-88, 6-27-88, 2-22-89, 3-23-89, 9-26-89, 7-26-90, 10-30-90, 3-3-91, 9-30-

2 91, 10-7-91, 7-26-92, 3-1-93, 5-11-94, 6-6-96, 2-23-97,

3 40D-8.626 Minimum Aquifer Levels in Priority Areas of Hillsborough County North

4 of State Road 60. and Pasco and Pinellas Counties

5 -- ThA M--in i ,mm Am-.-Ar L'..l lanlII bA I ,, -. o Icvol

6lanhull We owed ns a Lo her. overae when we

7 -pplieetione

8 -l. r... aquifer ... ite. or M Aqi ..o I 1ve&a%-b



10 fol wing-*uideline-

11

12 -withdr"we i mp..t "-

13 th it has a Fri A idaOn monitor weolli

14re a ill ( neat

15 are preferred-

16 *U wol re pref d i





19 (1){mC Minimum Aquifer Lievels shall be set in the Floridan aquifer in areas

20 experiencing adverse impacts in lakes and wetlands caused by ground-water

"21 withdrawals.-- "...-""- "- "-'-' "b:-:l t-":' L

22 Wl v .'G, Icvol, i- bl..- th- Minim "m Aq"if,', L -l. If in-.u.c ie' d t" cxi s t.,-..,;

DECEMBER 12, 1997 BOARD DRAFT 8-42
*










1

2 9440D8. am-rL.. th L gaqif r 'a eon o id Lto b i bllo.a

3 Arutr Iifr L v b on. ,-,--Cn,.- -, Io o If _.,-aIo l- .. .. -u JI l l... IAI.,.... 1L l:

4 m,-pottOmrIc NIurc u.amI For ,o:c .uif,.,er sit.sw.m Minimum. Aq UCv i ,w
-6 ,t of the -.ore aobptin the MinimumLAeMel ini tIoMAM mqa itLe tir levet




7 i ... b lo th :.. Minim A.ui:p L vl 9 m ac .ibm It.n R:ul, l O-6.6 6AL $IAV

8 betow7

9 (2)(4) Minimum Aquifer Levels shall be determined based upon analyses of the

10 relationship between drawdown in the Flondan aquifers and the drawdown in lake

11 and wetland features, as described in Chapter Two. Part III of the District's

12 Methodology Manual described in 40D-8.091. F.A.C.. established 09 f llows.Those










17 (o Minimum Aquifer Levels are established as set forth in the table below.

18 Aquifer levels are deemed to be below the Minimum Aquifer Level when the lona-



20 Minimum Aquifer Level elevation is followed by an asterisk (*). it has been deemed

21 that upon effective date of the rule adoption the Minimum Aquifer Levels for those

22 aquifer sites the aquifer level is below the Minimum Aquifer Level.

DECEMBER 12, 1997 BOARD DRAFT 8-43











1 ACTUAL WELLS TO BE DETERMINED

2 Well Name Latitude Longitude Minimum Level (NGVD)
3 (a) RMP8d1 280342 823256 TBA
4 (b) T-2 280510 820438 TB
5 (c) Hutchinson 280552 823257 TBA
6 (d) Cosme 3 280608 823529 TBA
7 (e) Eagles CC 280609 823830 TBA
8 (f) Morris Bridge 1 280652 822042 TBA
9 (g) James 11 280653 823415 TBA
10 (h) Morris Bridge 13 280656 821751 TBA
11 (i) Berger 280700 822942 IBA
12 (j) Hillsborough 13 280703 823027 TBA
13 (k) T-1 280708 820748 TBA
14 (I) Debuel 280741 822709 TBA
15 (m) DGW2 280827 822055 BA
16 (n) Calm 33A 280834 823435 TBA
17 (o) T-3 280849 820537 TBA
18 (p) EW11 280905 823905 _TBA__
19 (q) Lutz Park 280913 822832 TBA
20 (r) Lutz Lake Fern 280921 822230 TBA
21 (s) EW N4 280945 823804 TBA
22 (t) EW 2N 281011 823905 TBA
23 (u)MW2-1000 281019 822114 ITBA
24 (v) SP42 281036 823056 TBA
25 (w) Matts 281102 822924 TBA
26 (x) Starkey Ranch WRAP 281135 823607 TBA

DECEMBER 12, 1997 BOARD DRAFT 8-44


--^










1 (y) SR54 281144 823046 TBA_
2 (z) DMW500 281204 822238 TBA
3 (aa) Seven Springs Deep 281223 823933 TBA
4 (bb) Ledantec 281255 823103 TBA
5 (cc) Starkey Regional 281312 823616 TBA
6 (dd) Starkey 1A East 281443 823401 TBA_
7 (ee) MW1 281447 823542 TBA
8 (ff) Bexley 281449 823017 TBA
9 (gg) Starkey 707 281454 823802 TBA
10 (hh) Pasco 13 281559 822645 TB
11 (ii) NPMW-11 281631 823411 TBA
12 (jj) TMR4D 281650 822444 TBA
13 (kk)TMR1D 281719 822246 TBA
14 (II) TMR3D 281745 822342 TBA
15 (mm) NPMW-7 281825 823405 TBA
16 (nn) TMR-2 281845 822240 TBA
17 (oo) SR52 East 281918 822645 TBA
18 (pp) FK6D 281938 822423 TBA
19 (qq) SR52 West 282010 823737 TBA
20 (rr) SRW 282035 822839 TB
21 (ss)CB1SED 282100 822628 TBA_
22 (tt) SERW 282206 822711 ITBA
23 (uu) CB3ED 282221 822419 TBA
24 (vv) WRW 282324 822853 TBA_


25 Specific Authority 120.54. 373.042. 373.044. 373.113. 373.171 FS. Law Implemented

26 120.54, 373.016. 373.023. 373.0395. 373.042. 373.171 FS. History New

DECEMBER 12, 1997 BOARD DRAFT 8-45
*









1 The following document is incorporated by reference in Rule 40D-8.091, F.A.C.

2 METHODOLOGY MANUAL

3 PART I- LAKE LEVELS

4 CHAPTER ONE INTRODUCTION

5 (1) Objectives Under Part I of Chapter 373. Florida Statutes (F.S.). and Chapter

6 40D-8. Florida Administrative Code (F.A.C.). the District is responsible for establishing

7 minimum levels for lakes within its jurisdiction. Pursuant to Chapter 373.042. F.S..

8 minimum levels shall be calculated using best available information, and may reflect

9 seasonal variations. The District shall also consider, and at its discretion may provide for.

10 the protection of non-consumptive uses in establishment of Minimum Levels. The

11 objective of this document is to identify and describe the usual procedures and methods

12 used by District staff in determining and proposing lake levels to the Governing Board.

13 (2) History of the Lake Levels Program Since the mid-1970s, the District has

14 maintained a program to adopt management levels for lakes throughout the District.

15 These management levels were selected to be representative of a healthy fluctuation

16 range for each lake and can be used for water management purposes. Prior to 1996.

17 management levels had been set on 397 lakes. However, in 1996. revisions to Chapter

18 373. F.S.. resulted in changes to the Lake Levels Program. The most substantial change

19 to the program was the requirement that e Minimum Levels be established. Thesele

20 Minimum Levels are is the levels of a lake at which further withdrawals would be

21 significantly harmful to the water resources of the area. As a result of the 1997 rule

22 revisions, for those lakes for which levels are adopted after September 9. 1997. the terms

DECEMBER 12, 1997 BOARD DRAFT 8-46









1 management levels. Minimum Flood Level and Low Management Level were changed to

2 the HighGuidance Levels. Annul Hiah- L-eve and Ami,-nef Low Guidance Level.

3 respectively. The Extreme Low Level was deleted from the methodology and will no longer

4 be an adopted level.

5 (3) Criteria for Inclusion of Lakes in the Lake Levels Program Historically, lakes

6 were included in the Lake Levels Program based on several criteria. These' criteria

7 included lakes with District water control structures, lakes with water use permits and lakes

8 20 acres or larger with multiple owners. In response to legislative mandates in 1996.

9 criteria were added to the lake selection process which emphasized lakes located in Water

10 Resource Caution Areas, lakes in the vicinity of major water withdrawals and lakes

11 specifically identified by local governments or other entities. The revisions to Chapter 373.

12 F.S.. also required that the District adopt a Minimum Flows and Levels (MF/L) Priority List.

13 The MF/L Priority List. which identifies the lakes and the time frames for establishing

14 levels, is included in the District Water Management Plan.

15 (4) Levels Established under the Lake Levels Program The levels defined below

16. will be established based on the procedures and methods discussed in this document. All

17 levels shall be expressed in feet relative to National Geodetic Vertical Datum (NGVD) of

18 1929. Guidance Levels. --d --cribcd -n ,otion a. b,,w. are established for all lakes

19 in the Lake Level Program as described below feHew- P.e-medifieetio ,Guidan.,

20 ... 1 :.. L I

21 'o-'e ...d.L. o1i- f- -d- .rFa c. -. "------- P mo------o --'- -"- ....



DECEMBER 12,1997 BOARD DRAFT 8-47












2 Bo illd oun SLa 61%o of. Io lavs

3 A-Minimum Level(s) will also be determined and recommended to the Governing Board

4 for lakes included in the Lake Level Program.

5 (a) Guidance Levels determined by the District using the best available information

6 and expressed in feet relative to National Geodetic Vertical Datum. The method used

7 depends on the degree of the structural alterations and changes to the lake. Chapter

8 3 describes the establishment methodology for lakes that are not substantially

9 modified by structural alterations. Chapter 4 describes the establishment

10 methodology for lakes that have been substantially modified by structural

11 alterations. They are used as advisory information to aid in the control of adjustable

12 structures, for lake shore residents and for local governments. Guidance Levels include:

13 Ten Year Flood We'' ti. Level: Pic. modifti Ang n l HiO 5 e

14 m- :-dificati- nn-al High Level: o-m:dificati:n Annual Low5., .. and Pst-

15 modification-: Annual Low Level.

16 1. Ten (10) Year Flood Warmmit Level is an advisory level provided as a

17 discretionary guideline for lakeshore development. The Ten (10) Year Flood Warnin

18 Level, reflects ieeporperates the water level resulting from a rainfall event of flooeedin

19 expected-en a frequency of but not greater than ten percent (10%) probability of

20 occurrence in any given year.





DECEMBER 12, 1997 BOARD DRAFT 8-48










1 OWN PWPro-moifiction LIvel~ *refero toake rwar %-rpame bwo %Wr n imv etebv

VV2 ithdrawal Dd bfrmoi4ioL ""of u c watr eaoveyanee s Mse atd

3 waterwithdrawal

4 2.-.Pe ,m-am ifi atin A nnual Hia High Guidance Level is the elevation that

5 the lake level equal Nhighest voel to which -leke is expected to equal or exceed ten

6 (10) percent of the time on a long-term -luctuate n an average nnua- basis.

7 3.b Piemoific on A-Mu..a Low Guidance Level is the elevation that the

8 lake level thN lowest level t whi-a1 -4ke ais expected to or exceed ninety (90) percent

9 of the time on a long-term fluctuate o' n a..avrae. ann basis.

10 .3. %atm 1 evels 5 r Fr m wa gir
11 altrAti to thm ic uI ce viwpater ony eveance stm


12 -0 Po-modia n Annual ia(b) Minimum Levels I floa i t



21 1. Premodificatio n High imum Level a r The High Minimum LAevel is the
14 1, ._-_ f.. .:= .. we :5.%.. A 1.%..15 1 #-. %v n %..of :...=-.. L:oXL.%... n n .... v n .. L: nn :.%ol I." v"












DECEMBER 121997 BOARD DRAFT 8-49
15 ,o I..ct.,.. .. ... ........ ......l ,ba i= .

16 1-.4.P o .t- J-di-i-LIation Ann..lL.. w Ln in fo. nl:.n ..... :,t .t. r r ..i me





19 to fliu ctuate .. ... ..v ..r ... Ie Inn al a-I--.-

20 (b) Minimum Levels

21 1. P"e-"od:--t.F.ea.ti-- Hiah Minimum Level- The Hiah Minimum Level is the

22 elevation that the lake level is required to equal or exceed ten (10) percent of the

DECEMBER 12, 1997 BOARD DRAFT 8-49










1 time based on long-term fluctuations. It is calculated by subtracting an offset from

2 the High Guidance Level. Adjustments for structural alterations and changes may

3 apply as described in this Part I of the Methodology Manual. 13 equl -'t-the re--

5 oi % fy L dwl

5 L lwhengs thlaeos d pevotion reeresenting- the P50 fr the previous ox r\ vci a4

6 d rd ii .. ,lo l Ann..... l .I .. I, --I

7 2. Pe9-rfmefietieon Minimum Level The Minimum Level is the elevation that

8 the lake level is required to equal or exceed at least fifty (50) percent of the time

9 based on long-term fluctuations. It is calculated by subtracting 0.8 feet allowable

10 offset from the long-term median lake stage. Adjustments for structural alterations

11 and changes may apply as described in this Part I of the Methodology Manual, for

"12 lI.... :l -- .- -&- -.. .... ---- ...... e ..... LL. L .

13 d temin.m d fro thM r 1ao data Md 6% tabl.s "h the o t-mo cAtion A n.o**Iff
13

14 fA hhtEE.


"17 A .....AnAi L AIS.... ...I Fo, r lans ....itnh e tan ...6 .,n ,of. hv rloai dnA ,,
16 mNodis c tioN M inimumI% ,vl ia te midu point%,W P.r ,,w onI the m o,-m,,.,e,, ,



18 l...o.... L.- ,i:-i:u.... 1.. .... L,,ti L ,....r ---n th- P50 fr th p i:

19 Vix m6 ,...rs i.I ,lo hL. m Mimumm Le l.,

20 (5) Definitions The definitions in this section apply to the determination of all levels

21 described in this document.



DECEMBER 12, 1997 BOARD DRAFT 8-50










1 (a) P10 a percentile ranking defined as the elevation of the water surface of a lake

2 that is equaled or exceeded 10 percent of the time as determined from a long-term stage

3 frequency d.ur.atio analysis.

4 (b) P50 a percentile ranking defined as the elevation of the water surface of a lake

5 that is equaled or exceeded 50 percent of the time as determined from a long-ter stage

6 frequency duratieo analysis.

7 (c) P90 a percentile ranking defined as the elevation of the water surface of a lake

8 that is equaled or exceeded 90 percent of the time as determined from a long-term stage

9 frequency dwe'tim.t analysis

10 (d) Reference Lake Water Regime (RLWR) are is a regional factors that

11 approximates the long-term fluctuation ranges of a lakes. It is used when the natural

12 fluctuation range cannot be calculated, either due to a lack of long-term hydrologic

13 data, or the available data reflects a period when the lake fluctuation appeared to

14 be impacted by water withdrawals. the typical annual ran' e o. f lake -.

15 .l......atio fLr V within imlasr Ll4 Pali na %n maeL s"" Mhor ,



17 ir esond to .Stimate th Ann. Hig o Annu l Lo- L-el for.lk w ,

18 ."l- .-h..olf-.= t- .i-i n- bc .n.i-, .. f o o. (See Chapter Five.)

19 11 n,'i ,1. t ,iZiiI , lllII l II

20 ...w.te surface of. a .... cauolo or cxeccda o patcu1 .l.vtio:I.. A tAAe teai .... tA





DECEMBER 12, 1997 BOARD DRAFT 8-51
*










S m...,,..ene ip f o urrence,1 of tho1e -,,o for n,,,m







"7 -':-: ..... "-:- 'd. "u3.':..- n ..g..L = ..._
2 monthly reACdin i.

3 -1. I Pr-modVU~i~~f~ication~ StagI Duratio Cuve~ S astad,.,ten curve prepared



5 natural fluctu-ation range of the Dlake. C o a n curve o



12 f. Maximum d esirable operatin- level the level which is established from

8 (e) Changes and structural alterations the addition of pipes. culverts.

9 ditches, dams. weirs, fill or other non-natural materials to the physical

10 characteristics or natural surface conveyance system of a lake which impact the

11 natural fluctuation range of the lake.

12 f. Maximum desirable operating level the level which is established from

13 observation of the elevations of:(1) structures built close to the water (docks.

14 seawalls) and (2) natural vegetation such as willow (Salix so.). buttonbush

15 (Cephalanthus sp.) and cypress.

16 ---(f P~-At~U III~romofIcti o period beforeVlaks watner reeimes were ipncted

A 7

18 withdrawal .



20 huJ--- -'





DECEMBER 12, 1997 BOARD DRAFT 8-52









1 CHAPTER TWO DETERMINATION OF TEN (10) YEAR FLOOD WAI"PING LEVELS

2 (1) General The Ten (10) Year Flood Warnin Level shall be established using

3 methods that correspond to the hydrology and type of conveyance system of the lake

4 being evaluated. Generally. lakes are classified as open basin lakes that discharge and

5 closed basin lakes. Open basin lakes that discharge are those lakes that have a surface

6 water conveyance system that by itself. or in series with other lakes, connects to or is part

7 of an ordered stream or creek. A closed basin lake, has no outlet conveyance system, or

8 has an outlet system that overflows only during peak elevations. The methodology to be

9 used for the determination of the 10-year Flood Warmin, Level of these two lake types is

10 given below.

11 (2) Lakes that discharge 10-Year Flood Wamrine Levels for lakes that discharge

12 shall be established using numerical single storm event models. Rainfall depths shall be

13 taken from Part D of the District's Environmental Resource Permitting Information Manual.

14 Runoff volumes shall be computed using conventional methods such as the Soil

15 Conservation Service (SCS) curve number method, or with standard infiltration formulas

16. (e.g. Hortons Equation. Green-Ampt Equation). Runoff distributions shall be computed

17 using conventional methods including the SCS method or other unit hydrograph methods.

18 or the kinematic wave overland flow method. Modeling programs that account for tailwater

19 and compute backflow are preferred for the hydraulic routing. The initial water level

20 elevation used in the model of a lake that has not been substantially modified by

21 structural with- -- ianific-nt alterations to t ,atr'al a cnv'yane qnd,

22 -t"-let---nfi..etie shall be the Pr" -'difictin-' Ana High Guidance Level as

DECEMBER 12, 1997 BOARD DRAFT 8-53









1 determined for-es-defined in Chapter Three a. The initial water level elevation of a lake

2 that has been substantially modified by structural with-ei-nifieant alterations to-it

3 ta e nvevn r l shall be the Pet-

"4 m-difictio-n Annual igh High Guidance Level as determined defined in Chapter

5 Four 4. Exceptions shall be based on peer-review professional judgement by-the

6 -o-.-9riton -a1t60a ,.a aCo the-i ,,nsu and thoroughly documented in a report

7 or memorandum to the project file.

8 (3) Closed Basin Lakes Ten 40-Year Flood Weirepq Levels for closed basin lakes

9 and lakes that overflow only during peak elevations shall be derived using a frequency

10 analysis of lake stage readings, or lake stages predicted by a physically based numerical

11 "continuous simulation model." or an empirical simulation model derived either by linear

12 or non-linear regression methods. The choice to use a linear or non-linear regression

13 technique shall be based on engineering judgement. The simulation periods for either

14 numerical or empirical models shall be based on not less than thirty (30) years of

15 contiguous rainfall record. A composite of more than one rainfall station in the region in

16 which the subject lake is located is acceptable. Calibration of the simulation model shall

17 be based on as many indicators as possible including, but not limited to. stage records and

18 biological and physical indicators referenced in other parts of this document. If stage

19 records do not exist or the record does not contain peak elevation readings, then particular

20 attention should be given to obtaining eve-witness accounts of peak stages. Model

21 simulations to determine the Ten 40-Year Flood W'ernin Level shall exclude effects of

22 water withdrawals.

DECEMBER 12, 1997 BOARD DRAFT 8-54









1 CHAPTER THREE DETERMINATION OF GUIDANCE AND MINIMUM PRE-

2 MOIFIGATION LEVELS FOR LAKES THAT HAVE NOT BEEN SUBSTANTIALLY

3 MODIFIED BY STRUCTURAL ALTERATIONS (NSA)

4 (1) General Lakes that have not been substantially modified by structural

5 alterations (NSA) lakes do not have modifications to their surface conveyance

6 systems which prevent the lake from achieving its natural fluctuation range, i.e.

7 inundation of fringing cypress wetlands. P -modifiAti-'n--- Lel refer t'--- -l. wt-



9 ceenet~t~~^"~L^~^ ~ alcifs and w1t0r6r:tr0

10 (a) Determination of Guidance and Minimum Levels for NSA Lakes Pre-

11 mrodifiotion levels may be determined from one or a combination of the following

12 procedures more fully described in Sections (2) and (3) below: analysis of stage dation

13 data: and analysis of biological and physical water level indicators. Other information used

14 to determine Pre-medificatien Guidance and Minimum Levels may include, but not be

15 limited to. survey data. maps and hydroloaic data from such sources as the United States

16 Geological Survey, the Army Corps of Engineers and General Land Office Notes. For NSA

17 lakes without stage tmration data and biological indicators, the Pr- modify

18 Low- Level Guidance and Minimum Levels may be determined using the Reference

19 Lake Water Regime described in Chapter Five 5.

20 (b) Reconciliation If Pro-m- difa-- tion Guidance and Minimum Levels are

21 determined using more than one procedure. the Pre-mdeeficat-in levels finally

22 recommended will be a reconciliation of the procedures used. Reconciliation involves

DECEMBER 12, 1997. BOARD DRAFT 8-55
S









1 comparing the levels determined by the various methods. If the Pe-moedificatio. IUevels

2 determined by each of the methods are similar, then the levels determined from analysis

3 of stage dwetief- data take precedence unless the stage duretiatn data are determined

4 to be impacted by water withdrawals. If.the levels determined by each of the methods are

5 not similar, then possible reasons for the differences should be investigated. Physical

6 indicators should only be used to determine the levels if biological indicators and

7 hydroloaic data are not available for the lake.

8 Biological and physical indicators have been used to determine water levels. (Geeke;

9 4-9;: Davis. 1973: Florida Board of Conservation. 1969: Holcomb & Wegener. 1971:

10 Kenner. 1961). This approach has been used primarily to determine high-water levels on

11 lakes (Bishop. 1967: Knochenmus, 1967). Dooris and Courser (1976) related both high

12 and low water levels to various biological, hydrological and cultural features.

13 (2) Analysis of Stage Bturtieft Data This method applies only to lakes which have

14 sufficient long-term a minmum--- si (6) r. of Pro -modifi'n- stage data which do

15 not reflect a fluctuation range impacted by water withdrawals or alterations to the

16 surface conveyance system of the lake (i.e.. the P10 elevation is equal to or greater

17 than the elevation of the biological indicators).

18 (a) Pe mdifict,, ,, n ,,..,ul igh High Guidance Level The Flood AnnuaL

19 Hiu.h Level is equal to the elevation corresponding to the P10 value as determined from

20 a stage frequency analysis. o ,r- v.ci Durtion Cuv.





DECEMBER 12, 1997 BOARD DRAFT 8-56










1 (b) "c.. I -' if ict..i Annua Low Guidance Level -- The are-mdiftin Ann

2 eowLevel is equal to the elevation corresponding to the P90 value as determined from

3 a stage frequency analysis. -n a re- mdifitin ta Durt u

4 (c) Minimum High Level is equal to the elevation corresponding to the High

5 Guidance Level less the applicable offset.

6 (d) Minimum Level is equal to the P50. as determined from a stage frequency

7 analysis, less 0.8 feet.

8 (3) Analysis of Biological and Physical Indicators This method is applied to lakes

9 for which one or more biological and/or physical indicators are present. The methodology

10 is based on known relationships between the location of wetland and upland plant species

11 and Pre-modification water levels which do not reflect substantial structural

12 alterations.

13 (a) Methods for Site Selection and Measuring Indicator Elevations Elevations of

14 the indicators described in Subsection (3)(b) below shall be measured using accepted

15 surveying practices.

16 Locations for measuring biological indicators shall be chosen based on the presence of the

17 indicator plant species. Preferred locations will have naturally vegetated wetlands around

18 the lake. fringed by palmettos or other upland plant species. As many transects as

19 practical should be measured in each of these areas. If multiple specimens of each

20 indicator species occur on the lake. then elevations should be determined for as many

21 specimens as practical.



DECEMBER 12, 1997 BOARD DRAFT 8-57


-- *










1 In the absence of naturally vegetated wetlands and uplands, elevations shall be measured

2 for any available biological indicators included in this document. Activities which may have

3 impacted elevations, such as, filling, soil subsidence, land clearing and similar activities

4 shall be considered and accounted for during evaluation and analysis of the data. If no

5 biological or physical indicators are present, proceed to Chapters Four and Five.

6 (b) Pe -medification Annual High High Guidance Level Biological indicators of

7 the Pr e-mdifictio Annual Hgh High Guidance Level may include, but not be limited

8 to. the following: palmetto (Serenoa repens): cypress (Taxodium sp.): lonaleaf pine (Pinus

9 Dalustrus): live oak (Quercus virginiana): and mature wax myrtle (Mvrica cerifera).

10 1. The method for measuring elevations of the indicator plants is described below.

11 Data recorded includes the elevation of the indicator species and for trees, the diameter

12 at breast height (DBH).

13 a. The elevation of the soil at the base of the lowest lakeward extent of the palmetto

14 (Serenoa repens) fringe is measured at the lowest rooted extent of the plant.

15 b. The elevation of the soil at the base of the highest landward extent of the cypress

16 (Taxodium so.) fringe is measured on the landward side of the tree at the base of the trunk.

17 c. The elevation of the soil at the base of the lowest lakeward extent of longleaf pine

18 (Pinus palustrus) fringe is measured on the lakeward side of the tree at the base of the

19 trunk. Note: Only longleaf pine shall be used to establish the High Guidance Aftnut.

20 Hi Level.





DECEMBER 12, 1997 BOARD DRAFT 8-58
q









1 d. The elevation of the soil at the base of the lowest lakeward extent of the live oak

2 (Quercus virginiana) fringe is measured on the lakeward side of the tree at the base of the

3 trunk for trees with a minimum diameter at breast height (DBH) of 24".

4 e. The elevation of the soil at the base of the lowest lakeward extent of the mature

5 wax myrtle (Mvrica cerifera) fringe is measured on the lakeward side of the tree at the base

6 of the trunk.

7 If more than one specimen of each indicator species is measured. then the average

8 elevation and standard deviation are calculated for the indicator species. The average

9 elevations of the indicator species are used in the analyses of the Pr .mdifia--'ti-

10 eveles. If multiple biological indicators occur on the lake. then the Pr,-m di.fticat

11 Ann ua-liah High Guidance Level may be determined from the biological indicators

12 using best-s ientifie professional judgement. If more than one indicator plant species

13 is present and measured, then typically the priority order for use of biological indicators

14 is palmetto, cypress. pine and/or live oak and mature wax myrtle.

15 2. In the absence of. or in support of. biological indicators, physical indicators may

16. be used to determine the Pre-mo tio- Annual Hh High Guidance Level. Physical

17 indicators may include, but not be limited to. one or a combination, of the following:

18 a. The elevation of the toe of the highest landward scarp line. (Bishop,. 1967 and

19 Knochenmus. 1967).

20 b. Analysis of historic aerial photography, topographic maps. surveys, site plans or

21 other information that may identify locations or elevations of biological indicators of the

22 Prc -modifict--i An^1.' High Guidance Level.

DECEMBER 12, 1997 BOARD DRAFT 8-59









1 c. The elevation of stratified beach deposits (Bishop, 1967 and Knochenmus. 1967).

2 If none of the above biological or physical indicators exist along the lake shore and

3 cultivated groves of perennial woody species (i.e. citrus trees, pine plantations) occur along

4 the shoreline, then the lowest lakeward elevation of the cultivated species may be used to

5 determine the r- mcdific,,t,, Annual -,ih High Guidance Level. The lowest

6 lakeward elevation of the crop shall be measured at the lowest rooted extent of the crop.

7 This method is not applicable if the cultivated species is water dependent or water tolerant

8 crop.

9 (3 (c) Pre -m-"fc-ti3n Annual^ Low Guidance Level Biological indicators of the

10 r,,r mdificatin Annual Low Guidance Level may include, but not be limited to. the

11 average elevation of the soil at the base of the lowest lakeward extent of the cypress

12 (Taxodium op.) fringe. The elevation of the lowest lakeward extent of the cypress trees

13 shall be measured on the lakeward side of the tree at the base of the trunk.

14 If other biological indicators of the "re-m- difi-cat-on-A'^- Low Guidance Level are

15 proposed, they must integrate water levels over a long period of time and must persist after

16- water levels have receded. For example, due to their rapid growth and colonization rates.

17 the lowest lakeward extent of emergent and floating aquatic plants such as lotus (Nelumbo

18 spp.). pickerel weed (Pontederia SDD.). maidencane (Panicum hemitomon) and torpedo

19 grass (Panicum reDens) are not a suitable indicator of Prer.-meiie--ti-n -Annua Low

20 Guidance Levels.

21 (d) The High Minimum Level is equal to the High Guidance Level determined

22 from the biological indicators less the applicable offset.

DECEMBER 12, 1997 BOARD DRAFT 8-60









1 (e) The Minimum Level is equal to the High Guidance Level determined from

2 the biological indicators less (RLWRSO + 0.8 feet). The RLWRSO is subtracted from

3 the High Guidance Level to approximates the P50 for a lake in the absence of

4 adequate hydrologic data.

5 (4) Reference Lake Water Regime The RLWR is used only if stage diuration data

6 and biological or physical indicators of the ---'dific:t- n Annual Hh Minimum

7 Flood Guidance or Annual Low Guidance Levels are not available. The Reference Lake

8 Water Regime (RLWR) represents a lake level fluctuation range, and therefore cannot be

9 used alone to establish lake levels. The RLWR is used to calculate a Pre-m..odifiction

10 AnnuaHie m ih High Guidance Level or Annuatt Low Guidance Level once a Pre-

11 ---"=--"--- ^ uol lgh High Guidance Level or A.Rnnol. Low Guidance Level has

12 been determined from one or more of the biological or end physical methods described

13 above. The Guidance Levels determined using the RLWR are used to calculate the

14 Minimum High and Minimum Levels in the absence of stage data and biological and

15 physical indicators.

16 (a) The P -m.,odifica'tn -Annual Hh High Guidance Level is equal to the Pre

17 m-dification- Annual Low Guidance Level plus the RLWR90.

18 (b) The Pr -modification Ann..' Low Guidance Level is equal to the Pre-

19 modification Annual High High Guidance Level minus the RLWR90.







DECEMBER 12, 1997 BOARD DRAFT 8-61









1 CHAPTER FOUR DETERMINATION OF PGT"-M9 c.A"""I" N GUIDANCE AND

2 MINIMUM LEVELS FOR LAKES THAT HAVE BEEN SUBSTANTIALLY MODIFIED BY

3 STRUCTURAL ALTERATIONS (SA)

4 (1) General Changed or structurally altered lakes have modifications (i.e.

5 pipes, culverts, dams. weirs, fill and other non-natural features) to their physical

6 characteristics or surface conveyance systems that impact their natural Pest-

7 modificti- n Le-el refer t, lae water level fluctuations rei .es. impacted by humen

8 ^OIV ^% xui W t wid1we.- Pest-m-odificatin Guidance. Minimum High

9 and Minimum Ltevels may be determined from a frequency analysis of stage duration

10 data and analysis of modifications of the surface water conveyance systems for from the

11 lake. Typically. biological indicators may not be used to establish Pent-modificatie

12 Guidance. Minimum High and Minimum Lievels. For lakes without stage durttien data.

13 Pot-m- difi ati-- Guidance. Minimum High and Minimum Lievels may be determined

14 by the application of the RLWR90 and RLWR50 described in Chapter 5.

15 If Pst-me,,fiatte, Guidance, Minimum High and Minimum Ltevels are determined

16 by more than one procedure. the Pest-m dificct(ie Guidance. Minimum Hiqh and

17 Minimum Ltevels finally recommended are a reconciliation of the procedures used. Levels

18 determined using analysis of stage datien data take precedence over the levels

19 determined from analysis of outfall elevations and the RLWR unless the stage drationf

20 data reflects a fluctuation regime that appears to be impacted by water withdrawals.

21



DECEMBER 12, 1997 BOARD DRAFT 8-62










1 and apmlicmtion of Maoh01 IAIM *i- --od onl iCf -uffic-mmin a rion aim:& arc-net

2 alal :I &l :larkolne i. iI, watrllll ,,dr

3 (2) Analysis of Stage B weatie Data This method applies only to those lakes

4 which have sufficient long-term '" mmu,:*,%m -o-: ---': ... cn .ti us years of t-

5 modification stage dw.atien data that were collected after alteration of the surface

6 conveyance systems of the lake and do not reflect impacts due to water withdrawals

7 h nt b im ted law wtr hAa.

8 (a) P,t-mdificatin. A-.nnl ,igh High Guidance Level The Pest-

9 modification Annual High Guidance Level is equal to the elevation corresponding to the

10 P10 value as determined from a stage frequency analysis., -- te Post-modif-a ---'

11 S Wa.. ,., .:%&.

12 (b) "" --- A.u Low Guidance Level The Post-mdificat

13 Annual Low Guidance Level is equal to the elevation corresponding to the P90 value as

14 determined from a stage frequency analysis. -'t-- "-- m--'di--"f-- g'---

15

1.6 (c) Minimum High Level The Minimum High Level is equal to the High

17 Guidance Level less the applicable offset.

18 (d) Minimum Level The Minimum Level is equal to the P50 as determined

19 from a stage frequency analysis of stage date unaffected by water withdrawals less

20 0.8 feet.

21 (3) Analysis of Outfall Elevations and Application of RLWR This method is applied

22 to structurally altered lakes wt""---" dfid ...urface w.ter convanc systems without

DECEMBER 12, 1997 BOARD DRAFT 8-63









I sufficient lona-term 'l-- thgn "s D)---n:n........ers -- P -m--odfi:-'- stage

2 dw'atien data or the available data reflect impacts due to water withdrawals or-lakes

-,3 wi -,a da ,- ,mpct w r ---,-,, The method accounts for modifications

4 to surface water conveyance systems on the lake that does not allow water levels to be

5 maintained above the invert elevation of the outfall.

6 Elevations of outfalls will be measured using accepted survey practices. In the case of

7 open ditches or canals. bottom elevations shall be measured and the highest legally

8 existing and maintained stable point along the outlet profile shall be the'control point. For

9 culverts or pipes. the controlling invert flowe.st-pint of the pipe or culvert shall be

10 measured and this will be the control point. For fixed crest weirs, the elevation of the top

11 of the weir shall be measured and this shall be the control point.

12 Elevations will be established for all outfalls on the lake using the above procedures.-f

13. ... th, e % de ,II, 5m 1 lf ..L ..... ... ... &i!luu .. .....

14 s the control pmeint. Professional iudgement will be used to determine the

15 controlling outfall feature elevation.

16 Once an inventory of the outfall control point has been completed, a determination

17 must be made regarding the effectiveness of the structure to impact the lake's

18 natural water level fluctuation. The effectiveness of the structure may be

19 determined if sufficient long-term stage data are available. If sufficient data are

20 available, then the control point elevation is compared to the current P10 elevation.

21 If the current P10 elevation is less than or equal to the elevation of the control point.



DECEMBER 12, 1997 BOARD DRAFT 8-64









1 then the control point is considered to be effective. In this case. the control point

2 is used as the High Guidance Level.

3 If the current P10 elevation is greater than the control point elevation, then the

4 control point is considered to be semi-effective. In this case. the current P10

5 elevation is used as the High Guidance Level.

6 (a) Non-Adjustable Structure/Open Conveyance

7 1 .a-Pe-t-modification Annuali-- ht High Guidance Level. -Nn-adijutable

8 structure1open ,cnveyanc, e The Poet--mo-ificatin Annual Hig.. High Guidance

9 Level is equal to the elevation of the lowest legal flow line control. The lowest legal flow

10 line control is the highest stable point along the outlet profile.

11 2. ,kPst-modification Annu.. Low Guidance Level. vNn-adiuteble

12 stA-,-,tureopen C-nveyncC --, The Pot-m, dificatin,, Annual Low Guidance Level for

13 lakes without sufficient long-term '-c" than sI (6) continuous vears-f stage data or

14 lakes with stage data that appears to be impacted by water withdrawals must be

15 determined using the RLWR described in Chapter 5. The Pet- modification Annua Low

16 Guidance Level is equal to the Pa- -':difiction An h :High Guidance Level

17 minus the RLWR90.

18 3. Minimum High Level The Minimum High Level is equal to the High

19 Guidance Level as determined from analysis of outfall elevations less the applicable

20 offset.

21 4. Minimum Level The Minimum Level is equal to the High Guidance Level

22 as determined from analysis of outfall elevations less (RLWR50 + 0.8 feet).

DECEMBER 12, 1997 BOARD DRAFT 8-65









1 (b) Adjustable Structures

2 1 .- Pest-odifiCtin Annual HiahGuidance Leve' ^A':dju-'-t'- Str-'t The

3 t-c mo"difiCatin" Annm.a High Guidance Level is equal to elevation of the maximum

4 desirable operating level the highest elevation t_ which the structure en bc

5 opera. t6d%

"6 2."d)P -Pt-modificati-o,.a A Low Guidance Level. Adjustable, C Strut...r The

7 a -modification: Aul.. Low Guidance Level is equal to the High Guidance in 1.

8 above less the RLWR90 '.we.t e vtin t:-- which the structure can be pWrtot"d.






























DECEMBER 12, 1997 BOARD DRAFT 8-66










1 CHAPTER FIVE REFERENCE LAKE WATER REGIME

2 (1) General In some cases there is insufficient long-term are- lttle- o-e- 'a

3 stage data or the existing tlke stage data may reflects impacts due to -human -ati iti

4 (e-eq water withdrawals. For lakes which have the potential for sustained long-term

5 water level declines, the P10 and P90 values are generally uncorrelated to Pre-

6 modifiation biological and physical indicators of water levels which reflect natural lake

7 water regimes. For the case where declines potentially could be were caused by water

8 withdrawals, the P10 and P90 values can not be used to determine Guidance Minimum

9 High or Minimum Levels because these levels do not reflect natural fluctuation

10 ranges. they would rndfthr ffct-"-'"-- --'-f the wter withdrw"l into th adopted--'-

11 evees

12

13 .. ...t I-I.A l l .. L..- L ,L., ,..,:-x-- .. .. .... .. ........ L .,.

14 n U ,m, uqn, ,#,uu muu r, I I ,n M L... .L ..u ...rE uu ... .. .....


16 LLS.2, I. A..... IL.O ,r --- r --..: ....




18 :2l ..cf .r.. we"r w., tr.a,. Rim Reference Lake Water Regimes (RLWR) are

19 regional factors that are developedto estimate ranges of lake level fluctuations that





22 absence of information necessary to determine elevations of biological indicators

DECEMBER 12, 1997 BOARD DRAFT 8-67










1 for the Low Guidance Level. The District will continue to investigate methods for

2 refinement of eeletileti)nt the RLWR and to estimate fluctuation ranges which can be

3 used to establish Guidance Levels. Minimum High and Minimum Levels.

4 For lakes with insufficient data and that are not impacted by water withdrawals to

5 establish Guidance. Minimum High and Minimum Levels, then Guidance Minimum

6 High and Minimum Levels established by use of the RLWR will be used -re-eon,-dered

7 to- be proviso inat until long-term si- year -ef- ke stage data have been collected.

8 Following collection of sufficient data. an analysis of the adopted levels and stage data will

9 be conducted and a recommendation made as to whether the Governing Board should

10 consider reestablishing the levels.

11 Two RLWR factors are defined for use in determining Guidance. Minimum High and

12 Minimum Levels. They are:

13 (1 Reference Lake Water Regime-P90 (RLWR90) The RLWR90 approximates the

14 expected range of fluctuation that occurs between the High and Low

15 Guidance Levels. It typically is used to estimate the Low Guidance Level

16 w hen information is available to determine the High Guidance Level, but there

17 is insufficient long-term unimpacted stage data and there are no biological

18 indicators of the Low Guidance Level.

19 (21 Reference Lake Water Regime-P50 (RLWR50)- The RLWR50 approximates the

20 expected range of fluctuation that occurs between the High Guidance Level

21 and the P50 elevation. It typically is used to estimate the P50 elevation when

22 information is available to determine the High Guidance Level, but there is

DECEMBER 12, 1997 BOARD DRAFT 8-68
*










1 insufficient long-term unimpacted stage data to calculate a P50 elevation

2 from a stage frequency analysis. The P50 elevation is the starting point to

3 calculate the Minimum Level.

4 Inon$A ire aA f th0 A t 1ore fewA Aak A ...re unAafiA...td law hm l an
5 civit.6 Tt9 a representi .numb55i~w %wer a

10% o 7i0l gl Ann% ual ct i in lake. p,,,, ,F levelm orV V.tillV hi l re lEted,% 11o ohan e














13 g .g. Hofu L. A dl=a ic t l,,, n l .,t on -.



15 (2) Calculation of RLWR -

16 (a) Identify lakes and the region of interest. Lakes used for determination of

17 the RLWRs must be located in the vicinity of. experience similar climate as. and

18 have a similar hvdroaeoloaic setting as the lakes) of interest, and the RLWR lakes

19 must have sufficient long-term stage data which do not appear to reflect impacts

20 due to water withdrawals.

21 (b) Calculate percentile rankings corresponding to the P10. P50 and P90

22 elevations for each lake data set which meets the requirements in (a) above.

DECEMBER 12,1997 BOARD DRAFT 8-69
ake" W~h leoo otg~o- e










1 (c) Determine lake level fluctuations. For each lake. calculate the differences

2 between the P10 and P90, and P10 and P50 elevations.

3 (d) Calculate the RLWRs. The RLWRs are calculated as the median of the

4 percentile differences for all the lakes. The RLWR90 is calculated as the median of

5 the long-term P10-P90 differences and the RLWR50 is calculated as the median of

6 the long-term P10-P50 differences.

7 i CAndpplain of tH iam 11be in *-a i


18 .... stIit .ll".I contin 1 to i....tia t. :.m.tho s f1r th R and....










21 RLWam- R i- .al.. .""-lat.d fm laks' in -h- ;c-a ri ..I ...e.t... .
12 for w.....ch r:--s -, b lsalis.... Fo .lowi d..- ..--- o ,rpr...nt-i










aDECEMBER 12, 1997 BOARD DRAFT 8-70 ctto o 9
Ad -7 th- A .- lk.A MM, eri to h AMfor Apm, Mt AEtkdokj


DEEBR1,19 OR DAT87














7 muat- share thSom laval pol! and t l.kI mnL..S h140 oI minim9 of1 a





8 me I A tLv 19 Sps I %I"m so c %ao 6% 1u a. e5%
9 k&2 a IcontiOoual1l u veIII a.of Istll %aW a F' xmmle Laa IF a %L InI0l Rdl -Li lm Moon or
4 Hnneig Gidan e 34e'mloS w 2A2 Flod Re'labor Low hGuiane Leel dagp eom upon

w Thrfoe the:oI L 1R I ugocd V W %41 6%r 6,%"Loo g mL%4ke4 1a c l to thIal m ian I wth
1M a P.. 0I60 6.Al_ .2I, .M...-coa BdpA IU -- -- I.,.. I .. IT I I- -&, -,.,,-&. .--Part



















13 (3) ALpic.ation of RLWR The RLWR may be used to calcult either minimum
14 High m uidane PreifMReifi tn Flood L %aor ow 1 guidance Levels depend I ing ulo
12 (.a) Determinatio n lansof Pre4wJeiiaew .f .uidanie Levels for NSA lakes sing the
13 (3} Application of RLWR The RLWR may be used to calculate either Minimum



15 the biological and physical indicators present. The RLWR may also be used to calculate

16. the Peat-moficttm Low Guidance Level for SA Lakes.




18 RLWR.

19 1. ....":--':-^, A.,,, Low Guidance Level If there are biological or

20 physical indicators of the P"- --m" : Ana High Guidance Level then the Pre-

21 tmhdifieEtinA,. ,, Low Guidance Level can be calculated by subtracting the RLWR90



DECEMBER 12,1997 BOARD DRAFT 8-71









1 from the Pro -mdificatin Annual -h, r HiahGuidance Level elevation established by

2 the biological and/or physical indicators.

3 Pr,-mdificatin Au.,l Low Guidance Level = Pr-,,mdifict,,c, Ani .. High

4 Guidance Level RLWR90

5 2. Prc-mcdificatien Anni.., High Guidance Level If there are no sufficient

6 nimpeeted biological or physical indicators of the P. -mdifiatin A-fulw' High

7 Guidance Level, but there are biological indicators of the Amnttel Low Guidance Level.

8 then the P-rcMdifictin Annual High Guidance Level can be calculated by adding the

9 RLWR90 to the Pr"-m-odificati- n A^nuat Low Guidance Level elevation established by

10 the biological indicators.

11 Pro-modiflcation Ani.rl High Guidance Level = Prc .mdificti, n Annual Low

12 Guidance Level + RLWR90

13 (b) Determination of P -c-t ification Annu-l Low Guidance Level for SA Lakes

14 If the lake has substantial structural alterations and there is insufficient long-term

15 n---" al ... fa. 'at---r con.. ven.e of a laks. ha- b- m n mod.i.f. Imp .. ..n.. "-- --
16 -dit'- 1. "' --- --of"-L'-- o '----- Cl r '-~n three are no N--t-o-f data.

17 evaeiable. then the Pet-me--"df"-'e-- ^A..' Low Guidance Level must be determined

18 from the RLWR90. In this case. the Annu ,-P at m.difiatC_ Low Guidance Level is

19 determined by subtracting the RLWR90 from the Peot-modificati-n Annua, High

20 Guidance Level elevation established by analysis of outfall elevations.

21 P -at- mdific:ti-n Annual Low Guidance Level = Post-modification Annual High

22 Guidance Level RLWR90

DECEMBER 12, 1997 BOARD DRAFT 8-72










1 Note: To use the RLWR. either the High Ann^ual High u L ev or Anlwta Low Guidance

2 Levels must be available as starting points.

3 (4) Determining Effects of Water Withdrawals Before using period of record data

4 to establish Guidance Levels, it is necessary to determine whether the lake has been or

5 is potentially affected by water withdrawals. If lake levels are influenced by water

6 withdrawals, using the period of record data to establish Guidance Levels may not reflect

7 the natural fluctuation range of the lake "grandfath -" the ef"fecs -f a. w tr

8 withdraewelS. Determining effects of water withdrawals on lake levels can be

9 accomplished using one or a combination of the following methods:

10 (a) Analysis of the hydrologic budget of the lake.

11 (b) Statistical regression analysis.

12 (c) Continuous simulation models.

13 (d) Groundwater flow models.

14 (e) Analysis of hydrographs. and/or

15 (f) Analysis of existing studies.
















DECEMBER 12, 1997 BOARD DRAFT 8-73










1 CHAPTER SIX ADDITIONAL INFORMATION SUPPLIED TO THE GOVERNING BOARD

2 FOR ADOPTING LAKE LEVELS

3 General District staff may provide additional information to the Governing Board when

4 recommending Guidance. Minimum High and Minimum Levels to the Governing Board.

5 This information may include, but not be limited to. bathymetric maps. aerial photographs.

6 and elevations of docks, seawalls, house slabs and other structures. Information regarding

7 typical uses of the lake (i.e.. recreational uses. irrigation, potable water supply) and

8 surrounding land uses also may be provided.
































DECEMBER 12, 1997 BOARD DRAFT 8-74
q









1 PART II WETLAND MINIMUM LEVELS

2 CHAPTER ONE INTRODUCTION

3 (1) Objectives Under Part I of Chapter 373. Florida Statutes (F.S.). and Chapter

4 40D-8. Florida Administrative Code (F.A.C.). the District is responsible for establishing

5 minimum levels for wetlands within its jurisdiction. Pursuant to Chapter 373.042. F.S..

6 minimum levels shall be calculated using best available information, and may reflect

7 seasonal variations. The District shall also consider, and at its discretion may provide for

8 protection of non-consumptive uses in establishment of Minimum Levels. By July 1. 1996.

9 the District submitted for review and approval its priority list for the establishment of

10 minimum flows and levels, and delineated the order in which the Govering Board shall

11 establish the minimum flows and levels for surface watercourses, aquifers, and surface

12 water in the counties of Hillsborough. Pasco. and Pinellas counties. The objective of this

13 document is to identify and describe the usual procedures and methods used by District

14 staff in determining and proposing wetland levels in the priority areas of Hillsborough

15 County North of State Road 60. and Pasco and Pinellas counties to the Governing Board.

16 (2) Criteria for Selection of Wetlands for inclusion in the Minimum Levels Program -

17 Chapter 373.042(^ F.S. requires the District to prioritize the adoption of Minimum Levels

18 in waters of Hillsborough. Pasco. and Pinellas counties based upon the existence of. or

19 potential for. significant harm to the water resources or ecology of the area and shall

20 include those waters which are experiencing or may reasonably be expected to experience

21 adverse impacts. Minimum Level shall be set in a wetland, below which significant harm

22 shall occur to the wetland..

DECEMBER 12, 1997 BOARD DRAFT 8-75










1 (3) Definitions -

2 (a) Minimum Level a wetland is deemed to be below the Minimum Level when the

3 long-term median water level (staae (P50) is depressed more than 1.8 feet below the

4 normal pool elevation for that wetland.

5 (b)-Palustrine (isolated) cypress swamp a non-tidal wetland dominated by cypress

6 trees, shrubs, and persistent emergents (vegetation) and not a part of a flow through

7 drainage system.

8 (c) Normal pool a reference elevation established by a combination of biological

9 indicators including Lyonia lucida. epiphytic bryophytes (moss collars). Hypericum

10 fasiculatum. the buttress of cypress trees, and the ground elevation of cypress growing at

11 the outside edge of the cypress dome. This reference elevation is greater than ground

12 level and usually less than the seasonal high water mark.

13 (d) P50 a percentile ranking defined as the departure from normal pool that is

14 equalled or exceeded 50 percent of the time as determined from a stage frequency

15 analysis.

16 (e) Stage Frequency Curve a graphic representation of the percent of time the

17 water level is at certain elevations. A stage frequency curve is developed by plotting the

18 difference between the actual wetland water elevation and the normal pool elevation

19 against the cumulative frequency of occurrence of those differences for uniform increments

20 of time. e.g. monthly readings.





DECEMBER 12, 1997 BOARD DRAFT 8-76









1 (f) Reference wetland an isolated cypress wetland used in the analysis of

2 hydrological and ecological data to determine a level below which significant change

3 occurs to the wetland.

4 (g) Sentinel wetland an isolated cypress wetland designated as part of a network

5 established to monitor the regional ecology.




































DECEMBER 12,1997 BOARD DRAFT 8-77










1 CHAPTER TWO DETERMINATION OF MINIMUM WETLAND LEVELS

2 (1) General The Minimum Wetland Levels shall be established in palustrine

3 (isolated) cypress swamps. The intent of setting Minimum Wetland Levels is to provide a

4 measurement tool to determine when long-term alterations to the hydrology are sufficient

5 to be associated with significant harm to the water resources or ecology of the area. This

6 is accomplished by the establishment of a network of sentinel wetlands in the priority areas

7 within which Minimum Wetland Levels have been established. To do such. an evaluation

8 of the relationship between cypress wetland ecology and water levels was first necessary.

9 followed by the selection of the sentinel wetland sites.

10 (2) The relationship between cypress wetland ecology and water levels was

11 accomplished using the following procedure.

12 (a) Thirty-six (36) reference cypress wetlands were selected based upon the

13 following criteria:

14 (1) The wetland was classified as a palustrine (isolated) cypress swamp

15 (2) Monthly water level data existed for both above and below around level for

16 period of between four (4) and six (6) years during the time interval corresponding to water

17 years 1989 through 1994.

18 (3) The wetlands have not been substantially altered by drainage or other features

19 that divert or obstruct surface water flows

20 (4) The wetlands were accessible for the collection/verification of ecological data

21 and for the survey of normal pool elevations.



DECEMBER 12, 1997 BOARD DRAFT 8-78










1 (b) Ecological ratings were established using an established field assessment form

2 by professional wetland ecologists. Assessment consisted of nine categories with possible

3 responses for each category varying from one (1). worst case. to three (3). best case.

4 (c) Stage frequency curves were calculated for each of the wetlands and the P50

5 value recorded.

6 (d) Statistical correlation between the stage frequency P50 values and the

7 ecological rating data was performed to select the ecological data most responsive to

8 changes in the P50. This highly correlated data was retained and the median score of

9 each wetland calculated.

10 (e) Wetland ecologists determined that median scores of three (3) represented

11 conditions of no significant change. Median scores greater than two (2) and less than

12 three (3) represented conditions of significant change, and median scores less than two

13 (2) represented severe change.

14 (f) Statistical analysis of the frequency distributions of the P50 values associated

15 with no significant change and those wetland with significant change or worse was

16 performed to determine the P50 value that would correspond to the threshold between no

17 significant change and significant change to the wetland. This threshold was constrained

18 to so that the probability of error in either correctly or incorrectly classifying a wetland was

19 equal.

20 (a) The Governing Board established that significant change should be construed

21 as significant harm to the wetland ecology.

22 (3) The selection of the sentinel wetlands was accomplished as follows:

DECEMBER 12, 1997 BOARD DRAFT 8-79










1 (a) The sentinel must be an isolated palustrine cypress wetland

2 (b) Continued long-term access must be assured for monitoring purposes

3 (c) The site must have some evidence of connection to the underlying aquifer

4 (d) Ditches or other features that divert or obstruct surface water flows should not

5 substantially alter the drainage basin contributing runoff directly to the site.

6 (e) The site must contain sufficient biologic indicators to determine the normal pool

7 elevation.
































DECEMBER 12,1997 BOARD DRAFT 8-80










1 CHAPTER THREE ADDITIONAL INFORMATION SUPPLIED TO THE GOVERNING

2 BOARD FOR ADOPTING WETLAND MINIMUM LEVELS

3 General District staff may provide additional information to the Governing Board when

4 recommending Wetland Minimum Levels to the Governing Board. This information may

5 include, but not be limited to. potentiometric surface maps. information on surface-water

6 features and ecology of the area. ground-water withdrawal data. and geologic or biological

7 information.



































DECEMBER 12, 1997 BOARD DRAFT 8-81
4









1 PART III -MINIMUM AQUIFER LEVELS

2 CHAPTER ONE INTRODUCTION

3 (1) Objectives Under Part 1 of Chapter 373. Florida Statutes (F.S.). and Chapter

4 40D-8. Florida Administrative Code (F.A.C.), the District is responsible for establishing

5 minimum levels for lakes, wetlands, and aquifers within its jurisdiction. Pursuant to

6 Chapter 373.042. F.S.. minimum levels shall be calculated using best available

7 information, and may reflect seasonal variations. The District shall consider, and at its

8 discretion may provide for, the protection of non-consumptive uses in establishment of

9 Minimum Levels. By July 1. 1996, the District submitted for review and approval its priority

10 list for the establishment of Minimum Flows and Levels, and delineated the order in which

11 the Governing Board shall establish the minimum flows and levels for surface

12 watercourses, aquifers, and surface water in the counties of Hillsborough. Pasco. and

13 Pinellas Counties. The objective of this document is to identify and describe the

14 procedures and methods used by the District staff in determining and proposing aquifer

15 levels in priority areas of Hillsborough County North of State Road 60. and Pasco and

16 Pinellas Counties to the Governing Board.

17 (2) Criteria for the adoption of Minimum Levels in the Floridan Aquifer Chapter

18 373.042 (2), F.S.. requires the District to prioritize the adoption of Minimum Levels in

19 waters of Hillsborough. Pasco. and Pinellas County based upon the existence of. or

20 potential for. significant harm to the water resources or ecology of the state or region, and

21 shall include those waters which are experiencing or may reasonably be expected to

22 experience adverse impacts. The Minimum Level shall be set at the level of ground water

DECEMBER 12, 1997 BOARD DRAFT 8-82









1 in an aquifer at which further withdrawals would be significantly harmful to the water

2 resources of the area. In response to this legislative charge, the District has established

3 Minimum Levels in lakes, wetlands, and the Floridan aquifer in areas where around-water

4 withdrawals have contributed to the lowering of surface-water levels below the level

5 associated with significant harm. Additionally. Minimum Levels were set in areas where

6 significant ground-water withdrawals are planned, and the potential for significant harm

7 exists.

8 (3) Definitions -

9 (a) Historic a long-term period prior to significant affects by withdrawals.

10 (b) Current a long-term period representing existing withdrawal rates.

11 (c) P50 a percentile ranking defined as the elevation of the water surface that is

12 equaled or exceeded 50 percent of the time as determined from a cumulative frequency

13 analysis.

14 (d) Minimum Aquifer Level the elevation that the potentiometric surface at a

15 monitor well is required to equal or exceed 50 percent of the time based on a long-term

16. basis.

17 (e) Long-term an evaluation period used in assessing conditions through modeling

18 or statistical data analysis that represents a period of time of sufficient length such that the

19 evaluation period is insensitive to short-term fluctuations of the variables utilized in the

20 assessment e.g. changes in withdrawal rates and hydrologic conditions, in order to

21 simulate steady state conditions. This will vary because professional judgement is

22 necessary to establish the parameters to be used in the assessment of each application

DECEMBER 12, 1997 BOARD DRAFT 8-83










1 depending on the hydrogeology and climate of the area. the depth of and the number of

2 wells, and the quantity withdrawn. As a guideline, a minimum evaluation period of six

3 years is necessary.

4 (f) Reference Lake Water Regime is a regional factor that approximates the lona-

5 term fluctuation range of a lake. It is used when the natural fluctuation range cannot be

6 calculated, either due to a lack of long-term hydrologic data. or the available data reflects

7 a period when the lake fluctuation appeared to be impacted by water withdrawals.



































DECEMBER 12, 1997 BOARD DRAFT 8-84
*









1 CHAPTER TWO DETERMINATION OF MINIMUM FLORIDAN AQUIFER LEVELS

2 (1) General The Minimum Aquifer Levels shall be established using methods that

3 are appropriate for the hydrogeology of the area. The intent of establishing Minimum

4 Aquifer Levels is to limit the impacts to the long-term average potentiometric surface of the

5 Floridan aquifer to levels above those associated with significant harm to the water

6 resources or ecology of the area. This is accomplished by designing a network of

7 Minimum Aquifer Levels at Floridan aquifer monitor wells within the priority areas of

8 Hillsborough County North of State Road 60. and Pasco and Pinellas Counties. To do

9 such. an evaluation of the relationship between the surficial aquifer system and the

10 underlying Floridan aquifer is necessary.

11 (2) Depending on the available information. Minimum Aquifer Levels are set in

12 Floridan aquifer monitor wells using the following procedures:

13 (a) In areas where long-term data for lake levels do not exist and long-term data

14 for the Floridan aquifer are available, the Minimum Aquifer Levels are determined using

15 the following methodology:

16 1. Based upon the best available information, determine the historic potentiometric

17 surface elevation at the Floridan well. This can be determined through the use of actual

18 historic potentiometric surface data from the well. or. in the absence of such data. through

19 the use of appropriate ground-water flow models.

20 2. Based upon best available information, determine the leakance coefficient that

21 most accurately describes the confining unit between the surficial aquifer and the Floridan



DECEMBER 12, 1997 BOARD DRAFT 8-85










1 aquifer in the area of the well. Sources of this information include aquifer performance test

2 data and calibrated ground-water flow models.

3 3. Using Figure 3-1 determine the appropriate surface-water drawdown/around-

4 water drawdown (SWGV\ ratio for the leakance coefficient.

5 4. Based on an allowable drawdown in the overlying surficial systems of 0.8 feet.

6 use the SWGW ratio to determine the allowable drawdown in the underlying Floridan

7 aquifer potentiometric surface at the well. The surficial aquifer allowable drawdown is

8 divided by the ratio to calculate the allowable Floridan aquifer drawdown.

9 5. Subtract the allowable Floridan aquifer drawdown from the historic water level

10 to determine the Minimum Aquifer Level at the well.

11 (b) In areas where long-term data are available for lakes and the Floridan aquifer.

12 the Minimum Aquifer Levels are determined using the following methodology:

13 1. The current P50 lake level is subtracted from the Minimum Lake Level (MLL)

14 for each individual lake.

15 2. If historic lake data exists prior to water withdrawals, then a historic P50 is

16 calculated. If historic pre-withdrawal information is unavailable, then the reference lake

17 water regime (RLWR50) is subtracted from the Flood Guidance Level or the outlet control

18 elevation to determine a historic P50 (See Lake Levels Methodology under Rule 40D-8.091

19 FA.C.).

20 3. The current P50 of the lake is subtracted from the historic P50.

21 4. To calculate the percent recovery that Floridan aquifer levels would have to

22 achieve to insure that the Minimum Lake Level is reached, lake type must be considered.

DECEMBER 12, 1997 BOARD DRAFT 8-86





a



1 For structurally altered lakes, the percent lake recovery is derived using Equation 3-1. For

2 non-structurally altered lakes, the percent recovery is calculated using Equation 3-2. If the

3 P50.,,, level is equal to or above the Minimum Lake Level, then the lake currently meets

4 the Minimum Aquifer Level and no percent recovery is necessary.

5 Equation 3-1

6 Percent Recovery = [(MLL P50,,nt)/ (Control Pointt or Flood Guidance Levelt-

7 RLWR50) P50cuon] 100

8 t= The higher of the two elevations is utilized.

9 Equation 3-2

10 Percent Recovery = [(MLL P50,)/(Flood Guidance Level RLWRS50 P50 100

11 5. The percent recovery required for a lake is assumed to be directly correlated with

12 the recovery in the Floridan aquifer potentiometric surface beneath the lake. The percent

13 recovery is multiplied by the difference between the historic Floridan aquifer P50 level and

14 the current Floridan aquifer P50 level to yield an allowable Floridan aquifer change.

15 6. The Minimum Level is calculated by adding the Floridan aquifer allowable change

16 to the current P50 Floridan aquifer level (Equation 3-3).

17 Equation 3-3

18 Minimum Aquifer Level = [(% Recovery/100) (P50,,o,- P50,,,, + P50,t

19 (3) If alternative methods of meeting Minimum Levels in surficial features (lakes and

20 wetlands) are determined to be satisfactory in specific locations, the Governing Board may

21 allow appropriate adjustments to Minimum Floridan Aquifer Levels. Such alternative

22 methods may include, but not be limited to, rehydration. rotation of pumpage. deepening

DECEMBER 12, 1997 BOARD DRAFT 8-87
.










1 well casings, surface water management activities, or further reduction of withdrawals. In

2 areas where Minimum Floridan Aquifer Levels are adjusted. Minimum Levels shall be set

3 on all water resources of the area identified by the District. The ultimate achievement of

4 these levels will be outlined in the 40D-80 Recovery Plan.







































DECEMBER 12, 1997 BOARD DRAFT 8-88









1 CHAPTER THREE ADDITIONAL INFORMATION SUPPLIED TO THE GOVERNING

2 BOARD FOR ADOPTING FLORIDAN AQUIFER LEVELS

3 General District staff may provide additional information to the Governing Board when

4 recommending Minimum Aquifer Levels to the Governing Board. This information may

5 include, but not be limited to. potentiometric surface maps. information on surface-water

6 features and ecology of the area. ground-water withdrawal data. and hydrogeologic

7 information.
































DECEMBER 12,1997 BOARD DRAFT 8-89














Figure 3-1.




os
| 0.8 -


e 0.6 -


S0.4
I I I


082


0--- --------
1E-06 1E-05 1E-04 1E-03 1E-02
Leakance Coefficient (ft/daylft)








DECEMBER 12, 1997 BOARD DRAFT 8-90





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