Comment: This proposal is similar to the one I pre-
pared on 10 January 1975 but differs chiefly in the
substituion of high controlled levels instead of low.
This valuable improvement was suggested by W. A.
Duynslager, Director of St. Petersburg's Water Depart-
ment, to whom I am indebted.
27 March 1975
27 March 1975
A Proposal for the Regu'"tion of the Shallow Aquifer at ',e Cosme-Odessa and Section 21
in the maintenance of their levels.
PROPOSED OPERATIONAL PROCEDURE
Let the SWFWMD staff set regulatory levels for all lakes to be controlled. At a
frequency of four years in five, the control elevation for each lake will be the max-
imum.desirable level. If rainfall or other natural phenomena do not cause the lake to
reach its maximum desirable level during the period 15 June 30 September, St. Peters-
burg will introduce well water into the lake so that the level will be attained. Fluc-
tuations of lake levels at other times in the year will be left to nature.
At a frequency of one year in five (the specific selection to be made by SWFWMD),
the maximum operating level will be used in the procedure outined above.
In the case of impending hurricane or other disaster, the procedure may be modified
St. Petersburg will maintain records of the the times and quantities of water placed
in lakes and will also maintain records of lake stage for those lakes for which it is
now so equipped.
Hillsborough will be responsible for stage records for any lake for which St. Peters-
burg is not equipped to obtain, and will secure appropriate analyses of all involved
lake waters at least quarterly.
Even though the total amount of well water to be placed in the lakes under this
plan may not be large, there may be undesirable limnologic aspects to the augmentation.
Additionally, the low permeability of the shallow aquifer may not permit the achieve-
ment of the objective of this plan which is the maintenance of a high water table near
the boundaries of the well fields. Therefore, this plan should be implemented on a
trial basis and the results should be reviewed at yearly intervals.
This procedure does not represent any great innovation. St. Petersburg has pumped
water into several of these lakes in the past. The only new consideration of our pro-
posal is that of definite target elevations to be reached at least once a year.
Some of the water to be pumped into the lakes will be recycled back to the deep
aquifer and another small portion will be lost through evaporation. As a result,
operational costs of the well fields will increase. Such increase, however, will be
quite low in comparison to total operational costs and will certainly be very low
compared to the benefits.
THE SOUTH PASCO WELL FIELD
Any proposal for the South Pasco field should be presented by Pasco County and
its consultants, but perhaps a modification of this scheme for Cosme-Odessa and Section
21 would be useful.
There are no lakes in the South Pasco field, but there are a number of cypress
heads that could be used in a similar manner. In case of insufficient rain, water
could be introduced into selected cypress stands in order to form a water-table
mound as described above. (As an additional benefit, the cypress heads could be pro-
tected from the disasters that follow dewatering, as have occurred at Eldridge-Wilde.)
27 March 1975
A Proposal for the Regulation of the Shallow Aquifer at the Cosme-Odessa and
Section 21 well fields
the shallow to the deep aquifer. However, Hillsborough County has a different position:
we believe that shallow regulation should be adopted in order to minimize damage to
neighboring property. I agree with the SWFWMD staff in that leakance will take care
of itself (aquifer parameters being adequately known) through the deep regulatory levels
alone, and that a complex of shallow regulations is not necessary for that purpose.
Damage to neighbors is a different proposition.
Damage has occurred, and without question. There is no reason to list the cases
in this report.
Thus the regulatory scheme proposed herein attempts to minimize damage to the
shallow aquifer caused by high pumping rates. Further, the proposal outlines a method
that is relatively simple to administrate.
WELLS VS. LAKES
Regulatory levels could be established in specified shallow wells, as they are for
the deep monitor wells. However, the use of wells involves a number of disadvantages,
not the least of which is the problem of determining the level to be used at any given
location. Additionally, the water level in any shallow well can be temporarily influenced
by local phenomena that may thwart the well's usefulness as a monitor and that may not
be readily recognizable.
H. F. Oleson of the SWFWMD staff used lake levels in an earlier study of this
problem. As monitoring points, lakes have great advantages over wells. I propose the
use of lakes, below, and I acknowledge the value of Mr. Oleson's idea.
It is not necessary to regulate the water table throughout the entire area of the
well fields. Wishing to reduce damage to neighboring lands, we can concentrate on the
boundaries. Lakes can be selected at or near the boundaries, and through control of
lake levels, the adjacent water tables can be maintained within desirable bounds. Ob-
viously, the water table would be "mounded" around the controlled lake and due to the
low transmissivity of the shallow aquifer, the "mound" would have limited area extent,
To counterbalance this, a number of lakes should be used, but at the same time, it
would be unreasonable to use all lakes in the vicinity. Therefore, the suggestions that
follow attempt to reach a compromise between continual perimeter mounding and spot-
mounding at an insufficient number of points.
At the Cosme well field, the following lakes should be controlled:
Because of the linear distribution of St. Pete's so-called railroad wells, controls
cannot be established by a single lake. I propose that two be used, each being immed-
iately adjacent to the wells: Lake Calm at the north end of the line, and Lake James
at the south.
The lakes of the Section 21 well field are all interconnected by canals: controls
can be adopted for all. However, the biggest strain appears to be at Round Lake and
others east of the well field and perhaps St. Pete could become a more active partner
Hillsborough County Water Resources Department
A PROPOSAL FOR THE REGULATION OF THE SHALLOW AQUIFER
AT THE COSME-ODESSA AND SECTION 21 WELL FIELDS
27 March 1975
It is proposed to regulate the shallow aquifer at the Cosme-
Odessa and Section 21 well fields by establishing controls for a
series of designated lakes, for which SWFWMD would establish reg-
ulatory levels. During any year in which a lake does not reach
the maximum desirable level or the maximum operating level (at
frequencies determined by SWFWMD) at least once in the period,
15 June 30 September, St. Petersburg will introduce well water
so that the level will be attained. Fluctuations of lake level
at other times during the year will be left to nature. No change
is proposed for the method of regulating the deep aquifer.
The shallow aquifer of South Pasco well field could be reg-
ulated through a modification of the method summarized above.
Regulation through lakes has many advantages over batteries
of shallow wells, an important one being the simplification of
The Five-Party Water Agreement of 14 November 1973, established regulatory levels
in the Floridan Aquifer at St. Pete's Cosme, Section 21 and South Pasco well fields.
Those levels became effective on 1 August 1973 (South Pasco) and 1 November 1973 (Cosme
Section 21) and are being continued in force through regulatory orders of SWFWID.
The Agreement also provided that regulations would be established for the shallow
aquifer at the three well fields by 1 October 1974. As of late March, 1975, the es-
tablishment has not been made, but the SWFWMD Board is to consider the matter on 14
This report presents a proposal for the shallow regulation.
RATIONALE OF THE REGULATION
Pumping withdrawals of the well fields are regulated in the producing horizons of
the Floridan Aquifer. All agree that such a method should provide the prime control
and that regulation of the shallow aquifer should only supplement, but never replace
that of the deep.
There is some thought that shallow regulation should be adopted in order to main-
tain optimal head differences and thus to induce a favorable amount of leakance from
THE ; -* JAMES F. TAYLOR. JR.
S"JARD OF COUNTY COMMISSIONERS CLERK
S BOB LESTER. CHAIRMAN
DIST. 5. RUSKIN
ELIZABETH B. CASTOR, VICE CHAIRMAN
DIST. 3, TAMPA
ROBERT E. CURRY, DIST. 1, TAMPA WATER RESOURCE DEPARTMENT
BOB BONDI, DIST. 2, TAMPA
FRANCES M. DAVIN. DIST. 4, PLANT CITY
P. O. BOX 1110
TAMPA. FLORIDA 33601 mpa, Florida 3360
TELEPHONE: (813) 223-1311 Vi
Donald R. Feaster
Southwest Florida Water Management District
P. O. Box 457
Brooksville, Florida 33512
During the meeting of the SWFWMD Board of Governors on March 12, I stated
that I would prepare a proposal for the regulation of the shallow aquifer of the
Cosme-Odessa and Section 21 well fields. That proposal is attached, and I thank
you in advance for the consideration that you and your staff will give to it.
There is a fundamental difference between your staff and Hillsborough County
on this matter. On several occasions your staff has recommended to the SWFWMD
Governors that such regulation is not necessary. On the other hand, the Board of
Hillsborough County Commissioners believes that the regulations are mandatory
according to the terms of the 5-Party Agreement of 14 November 1973, regardless of
the opinion of your staff.
The attachment represents only one possible manner of regulation. Although the
proposal aims to maintain high water tables at selected boundary points around the
well fields by a method that is both "fair" and extremely simple to implement, it
could certainly be improved. I would be very pleased to consider any other proposals
that you may suggest.
Hopefully, this long-standing matter will be definitively resolved in the meet-
ing of the SWFWMD Governors of 14 May.
I Water Resources Director
cc: Derrill McAteer N. B. Johns J. C. Brown
J. A. Anderson R. B. Lambert J. D. Varn
S. C. Bexley T. Vander Veer
J. R. Graw R. E. Vaughn /
J. E. Hill L. M. Blaine/