DEPARTMENT OF THE INTERIOR
UNITED STATES GEOLOGICAL SURVEY


FLORIDA DEPARTMENT OF NATURAL RESOURCES
published by BUREAU OF GEOLOGY


MAP SERIES NO. 83


87.


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29.-


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126-.


PRINCIPAL USES OF FRESHWATER

IN FLORIDA, 1975


G. G. Phelps

Prepared by the
UNITED STATES GEOLOGICAL SURVEY
in cooperation with
FLORIDA DEPARTMENT OF ENVIRONMENTAL REGULATION
Bureau of Water Resources Management

Tallahassee, Florida
1978


INTRODUCTION
As a result of Florida's rapid and continuing growth in
population and industry, the demand for water for muni-
cipal, industrial, and agricultural supply has increased.
Information about the extent of available water resources
and the present rate of consumption are needed for plan-
ning and effective management of Florida's water re-
sources to meet water needs of the future. In 1975, the U.S.
Geological Survey and State water management agencies
jointly conducted a detailed inventory of water use through-
out the State to provide a data base to aid in predicting
future water needs. This map portrays some of the infor-
mation collected, including a generalized display of rates of
water use by the counties of the State and the principal
- purposes for which the water is used. Total water use, in
millions of gallons per day, for all uses by counties is shown
in the table.

CATEGORIES OF WATER USE
Five categories of water use were established:
Municipal.-All water delivered to a public-water sys-
tem regardless of the purpose for which the water was
used. Water supplied for commercial, agricultural, and
industrial use from public-supply pipelines was included
under municipal water use. All water systems meeting the
following criteria were included: Towns with population
greater than 5,000; County Seats; systems supplied wholly
or partly with surface water (rivers, lakes); systems using
desalination; other self-supplied systems such as residen-
tial subdivisions, mobile-home communities, and small
rural communities.
Self-supplied Industrial.-All industries not supplied
from municipal pipelines Also in this category were self-
supplied institutions such as universities, military instal-
lations, hospitals, and prisons.
Thermoelectric Power Generation -All water used for
cooling. Most thermoelectric power plants in Florida are
located on the coast and use mostly brackish or saline
surface water; with a few exceptions, only small amounts
of freshwater are used for cooling.
irrigation.-All water used for growing crops except
that supplied from public supply pipelines. Estimates were
based on the amounts of water diverted from its source.
First, the number of acres of each irrigated crop was
determined. Then the source of irrigation supply was de-
termined and an estimate made of the amount of water
supplied. This estimate was based on the number of irriga-
tion applications during the year, electric power records,
and pump ratings. Optimum application rates as recom-
mended by agricultural agencies for specific crops were not
used in this survey. Also included were golf courses and
nurseries.
Rural.-Refers to the difference between total county
population and population served by all municipal supplies
in the county. A per capital water-use rate of 100 gal/d was
used. Livestock population was also estimated and a local
per capital water-use rate was determined. Includes self-
supplied dairies.

WITHDRAWAL AND CONSUMPTION
Following the terminology defined by Murray and
Reeves (1972), freshwater is defined as water with less
than 1,000 mg/L of dissolved solids. Withdrawal use is
defined as the quantity of water withdrawn from its source.
Water may be lost during conveyance or may be returned
to the stream or aquifer after use. Consumptie use is the
quantity of water evaporated, transpired by plants, incor-
porated into a product, or consumed by man and livestock.
Some industrial users and thermoelectric power gener-
ators may withdraw large quantities of water for proces-
sing or cooling but may return most of the water to its
source, thereby consuming very little of it. On the other
hand, in rural areas, it is assumed that 80 percent of water
withdrawn for domestic supply was consumed and 100
percent of water withdrawn for use by livestock was con-
sumed
The large map shows, by means of symbols, the quan-
tity of freshwater withdrawn from natural sources in each
county in Florida in 1975. The symbols are divided to show
the water-use categories which account for the largest and
second largest percentages of the total withdrawal. The
smaller map shows the quantity of water consumed in each
county in 1975. On this map, the symbols also indicate the
two categories which account for the largest percentages of
the total consumptive use.
These maps give a general overview of freshwater use
in Florida; a detailed tabulation and discussion of with-
drawal and consumption for each county m Florida is being
prepared by the U.S Geological Survey (Leach, 1978).
REFERENCES
- Leach, S. D.
1978 Source, use, and disposition of water in Florida,
1975: U.S. Geol. Survey, Water Resources Inv.
78-17
Murray, C. R, and Reeves, E. B.
1972 Estimated use of water in the United States in
1970: U.S. Geol. Survey Circ. 676, 37 p.


I I I I I I I EX
The size of the symbol in
to the following scale:


5 -SANTA ROA less th




W 5Aso _. --, .. --_1















9 i .- 10more th-



/C iSA n








E X P L A N AN TD IO N
5
















less than 10 Mgal/day *,e.NAl.:'""| (I |
-AY





















.:L.- N"z r -^
,-- __. .






T7 .ii 0


.. .. i



11-50 Mgal/day SCEO



51-100 Mgal/day 3



L-- .; q( I ,4 1- ..




T '"- C^- "^ '

00 60" 1 22 1062 004 1..625
co2 64 9IL 3 62 9


TOTAL FRESH WATER WITHDRAWN FOR ALL USES ... 0 D. 'k V L

County M cpa Rrl Indtal Irraon The r c Totals -


S ? 053 2 0 20 30 40 50 MILES



Colerum a 170 177 02 1 472~


De
Escamba

06lad0
Gulf
arde
06endry

ndian r
Jack0n

Lake

















60.605.04


The symbols are divided to show which categories account
for the greatest and second greatest percentages of the
total, according to the following color code:


Municipal supply

Self-supplied industrial

Thermo-electric power generation

D Rural supply

Irrigation


The percentages used in the three remaining categories are
summed and the appropriate area of the symbol is left
blank. If one category accounts for 90-94 percent of the
total, the category ofsecondary importance is shown but the
sum of the remaining categories is not shown. If one cate-
gory accounts for 95 percent of the total or more, the entire
symbol is shown in the appropriate color.


PLANATION
idicates withdrawal rate according




an 10 Mgal/day -




0


-10-


--1 291


,It,*











jFW W6~



7."'* (2


+ m OWARD


C,5-LE ~ o z


C-'


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tooll





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