Title: Chief Hydrologist. "On Hillsborough County's Water Supply Situation, "
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00051600/00001
 Material Information
Title: Chief Hydrologist. "On Hillsborough County's Water Supply Situation, "
Alternate Title: Chief Hydrologist. "On Hillsborough County's Water Supply Situation, " Hydroscope. (Jan. 1973).
Physical Description: 1p.
Language: English
Publication Date: Jan. 1973
Spatial Coverage: North America -- United States of America -- Florida
General Note: Box 3, Folder 5A ( WATER SHORTAGE, VOL. I. B3F5 ), Item 9
Funding: Digitized by the Legal Technology Institute in the Levin College of Law at the University of Florida.
 Record Information
Bibliographic ID: UF00051600
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

asked us daily, therefore, we thought it
Brogden Bridge Structure Completed would be well to discuss this problem in the
present issue of the Hydroscope.
Regarding the quantity of water available
to us now and il the future, the best w4v to
Final inspection by Withlacoochee Basin Mr. Robert J.Gates, District Field find a useful answer is by means of a r-
Board members Ierman Beville, Francis Operations Division Director, who also budget analysis. This will be explainru in
Oden and L.D. Wells accompanied by attended the final inspection, will be the following paragraphs.
District Engineer Charles Miller signaled responsible for the structure's future WATER BUDGET ANALYSIS
completion of the structure which has been maintenance. The water budget is based on the equation
under construction since August 1972. of continuity which, in its simplest form is:
The structure, which consists of two P (precipitation) equals Et (evaporation)
mechanically operated sliding gates bet- plus R (runoff). Other elements, including
ween 130 feet of steel sheet piling, cost ap- ground-water and surface-water inflow and
proximately $54,000 and will aid in con- outflow, and changes in ground-water and
trolling the level of the Inverness pool in surface-water storage must also be included
the Tsala Apopka chain of lakes in Citrus if they are of such magnitude as to be of
County. Located between the Hernando Pool consequence. By choosing an area that is a
and the upstream Inverness Pool, the gates hydrologic unit, that is, one that is
will allow the District to maintain a level : i surrounded by water divides across which
that more closely parallels the upper Pool's no flow occurs, inflow and outflow factors
natural levels which have been determined can be ignored. And, if the budgeted period
to be between 38.25 feet and 40.25 feet above is long enough to begin and end at the same
mean sea level. time of the year, normally the changes in
The old structure, before it failed on May storage can also be ignored because a
26, 1969, was of the stoplog design and complete cycle of wet and dry seasons will
required a motor crane to make changes. have been completed and the water balance
The new structure can be hand operated by at the end of the period is the same as at the
use of a special crank or raised electrically beginning.
with a portable hand drill which can open or '2 QUANTITY OF WATER AVAILABLE FOP
close the gates in about four minutes. The USE
contractor for the work was Square G. illsborough County is not a hydrologic
Construction Company of Leesburg. unit. Both ground-water and surface-water
inflow take place across its north' -n,
; _, .^ , ". -- J eastern and southern borders .,
d:.:, .... ,' respectively, adjacent parts of Pasco, Polk
, ". The recently completed Brogden Bridge and Manatee Counties. But by drawing
S structure was inspected and recommended hydrologic boundaries on the Dotentiometric
4. -:r \,.'.-..o S { ^ :I2 for acceptance by (lower L to R) Herman surface map to coincide with ground-water
S | : .,.- Beville, Chairman Ex Officio of the and, incidentally and fortunately with
4 "N .-.. Withlacoochee Basin Board; Charles Miller, surface-water divides, a hydrologic unit can
-:. ... / Engineering Division Director; Fred Sch- be drawn that is not greatly larger than the
,-..... .. warz, Project Engineer; and Howard county. Actually, it is this larger area from
.. .* "H lHewitt, Square G Construction Company. A which Hillsborough County draws its entire
The Brogden Bridge structure is located on -top :he structure is Robert Gates, Director water supply, derived solely from
state road 581 in Citrus County between the of Field Operations, and Wayne Clark of the precipitation on its surface, and therefore is
Hernando and Inverness Pools of the Tsala same Division who demonstrated the the area we must consider in this study. It is
Apopka chain of lakes. structure's operational capabilities, an area encompassing about 1,633 square
miles, as compared with the county's land
Area of 1,038 square miles.
.? ./ The Florida Geological Survey, in 1961,
From The Desk Of The Chief Hydrologist: published a reprt (R.I No. 25) entitled
u m g ub n ty Wter iy niogs 14"wiater Resources of -lillsborough County,
Florida," prepared by C.G. Menke, E.W.
On Hillsborough County's Water Supply Situation Meredith and W.S. Wetterhall of the U.S.
Geological Survey.
The present report deri\ es essentially the
Thoughtful and concerned citizens of stage and in quantity of flow. Reports of same water-budget values as that of Menke
Hillsborough County are worried about the many wells "going salt" in the coastal areas and others but reaches a vastly different
safety of our water supplies, as is indicated along the Gulf, particularly in northern conclusion. Mtnke and others (p. 17) that
by numerous recent inquiries received here. Pinellas Countv and to the north in Pasco "an average of 1,410 mgd (million gallons a
The Water-supply shortages of last spring and Hernando C(untie\. add further to day) is potentially available." This is
and summer are still fresh in their minds; citizen concern. What is the situation in enough water to supply 1,250,000 person if
also, it is obvious that lake levels are low- Htillsborough County? Do we have enough all the flood waters could be stored ft e
many, even in areas of no obvious pum- water? Will our coastal wells also become ( the italics are mine). And this is the tiy in
page--and some lakes are approaching all- lost to salt-water encroachment? What can the ointment! All the flood waters cannot be
time low water levels with some already we do- to protect and conserve our water stored, in fact very little can be saved for
having established new record lows. resources? later use. Practically, we cannot expect to
Streams, too, are generally low, both in These and other related questions are (Hydro 3)

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