Citation
Water in Orange County, Florida ( FGS: Leaflet 8 )

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Title:
Water in Orange County, Florida ( FGS: Leaflet 8 )
Series Title:
( FGS: Leaflet 8 )
Creator:
Joyner, B.F.
Publisher:
Florida Geological Survey
Publication Date:

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Subjects / Keywords:
Water supply -- Orange County (Fla.)
Orange County ( local )
City of Orlando ( local )
Bodies of water ( jstor )
Aquifers ( jstor )
Lakes ( jstor )
Surface water ( jstor )
Streams ( jstor )

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University of Florida
Holding Location:
University of Florida
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The author dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law and all related or neighboring legal rights he or she had in the work, to the extent allowable by law.
Resource Identifier:
AAA0582 ( notis )
AJW7430 ( notis )

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Full Text
LEAFLET NO. 8
,ATER /#
OA?4VE CO/WTY
FlOR/DA
TALLAHASSEE
1968




Prepared by the
UNITED STATES GEOLOGICAL SURVEY
in cooperation with the DIVISION OF GEOLOGY
FLORIDA BOARD OF CONSERVATION and the
BOARD OF COUNTY COMMISSIONERS OF ORANGE COI




WATER IN ORANGE COUNTY, FLORIDA
By
3.F. Joyner, W.F. Lichtler, and Warren Anderson
What is the source of Orange County's water? Where is it stored? How much is available? How good is it? How is it used? What are present and future water problems? What can be done to protect sources of good water? These are some of the questions often asked about water. Some of these questions are easy to answer; others are difficult.
WHAT IS THE SOURCE OF
ORANGE COUNTY'S WATER?
The source of all fresh water in Orange County is rain--either on the county or on adjacent higher land areas. The average annual rainfall in Orange County is 52 inches, an average of 2,500 mgd (million gallons per day). Normally more than half this rainfall occurs during the 4-month rainy season from June through September.
WATER CYCLE
Water in nature constantly moves in what is known as the hydrologic cycle. It falls from the atmosphere as precipitation, evaporates from the land, vegetation, and surface-water bodies, moves over and through the ground to the lakes, rivers, and ocean and again evaporates.




5 57.5-7
F6 36X
Figure 1. Rain--Source of Orange County's water.
Of the 52 inches of rain that fall on Orange County in an average year, about 35 inches, oi 1,750 mgd, returns to the atmosphere by eva poration from lakes, streams, and the land, an by transpiration from vegetation--an orange tre! of average size transpires about 35 gallons o water per day. About 17 inches of rain, or 750 mgd, are left to recharge the ground-water reser voirs and help maintain flow in streams in th, county.
In addition to the rainfall on Orange County an average of about 180 mgd flows into th county from Lake and Osceola counties, both i




10
9
7
-j
U
z
0N In
04
z
1l111 WIN
2
JAN FEB MAR MAY JUNE JULY AUG SEPT OCT NOV DEC
Figure 2. Average monthly rainfall at Orlando.
streams and through the ground. About 30 mgd is consumed by various water users within Orange County, leaving about 900 mgd that flows from Orange County into Seminole, Breyard, and Lake counties in streams and through the ground.
WHERE IS ORANGE COUNTY'S
WATER STORED?
Orange County has enormous quantities of water stored on the surface and in the ground. The total amount varies somewhat from the rainy season to the dry season and from years of above-average rainfall and years of belowaverage rainfall. However, the amount of variation is small because most of the water is stored underground.




Figure 3. Cross section of Orange and Brevard
counties illustrating hydrologic cyole.
Stream channels in Orange County are not deeply incised and the amount of water stored 20in channels is insignificant in most streams.
Seepage of ground water to the stream channels temporarily sustains streamflow during dry weather, but all streams go dry or recede to very low flow during extended droughts except for the St. Johns Rivor and the spring-fed Wekiva River.
The amount of water stored in lakes varies considerably because lakes are subject to high evaporation losses (about 4 feet per year), seepage losses, and low rates of recharge during dry weather. Levels of some lakes fluctuate as little as 2 feet; others more than 20 feet. Water stored in the upper foot of the 55,000} acres of lake surface in Orange County is 18 billion gallons, enough to provide nearly 50 million gallons of water per day for a year.
SEA _Me
-30d[0 5 0 20 30 MILES
ThFigure wate3. Cross stored in ofthe lakes and streamrd
counties illustrating hydrologic cycle.
Stream channels in Orange County is gnerally soft, and low it mindeeply incised and the amount often is highly colstored in because of dissolved orgnificant ic most streams.
ThSeepage ofquantity ofund water tored in the groustream channel tempin Orarilynge County is stimated at many trillio weather, but allons. Porous rockas whichgo dry or re capablede o very low flow during extended droughts except for the St. Johns River and the spring-fed Wekiva River.
The amount of water stored in lakes varies considerably because lakes are subject to highi evaporation losses (about 4 feet per year), seepage losses, and low rates of recharge, during dry weather. Levels of some lakes fluctuate a-- little as 2 feet; others more than 20 feet. Water stored in the upper foot of the 55,0O00 acres of lake surface in Orange County is 18 billion gallons, enough to provide nearly 50 million gallons of waLer per day for a year.
The water stored in the lakes and streams in Orange County is generally soft, and low in mineral content, but it often is highly colored because of dissolved organic matter.
The quantity of water stored in the ground in Orange County is estimated at many trillion gallons. Porous rocks which are capable oil




yielding water to wells and springs are called aquifers. The uppermost ground-water reservoir in Orange County is the nonartesian or watertable aquifer which is composed primarily of quartz sand. This aquifer extends from the water table to a depth of about 30 to 40 feet below the land surface. The water-table aquifer will yield small to moderate quantities of water (5 to 20 gallons per minute) to small diameter sand-point wells. Larger yields can be obtained from larger diameter (over 2-inch) wells with screens. In most parts of the county, the water table is near the land surface and suction-type pumps are adequate to lift the water to the surface. However, in some areas of western Orange County the water table is more than 10 to 15 feet below the surface and submersible or deep-well jet pumps must be used.
Water from the water-table aquifer is generally very soft, low in mineral content, and slightly corrosive. In some areas the water is high in iron and/or color and may cause staining of fixtures and surfaces wetted by sprinklers. Shallow wells may be subject to contamination from septic-tank effluent or other pollutants unless the wells are located a sufficient distance from possible sources of contamination. In areas where the aquifer is composed of clean, coarse sand, and where wells are safe from pollution, the water-table aquifer is a good source of water for domestic use.
The Hawthorn Formation lies between the water-table aquifer and the underlying Floridan aquifer. Most of the Hawthorn Formation is relatively impermeable clayey sand and confines water in the underlying artesian Floridan aquifer. However, in some areas, particularly east and south of Orlando, porous layers of shell, sand, or gravel within the Hawthorn Formation will yield moderate to large supplies of water. The water levels in wells that penetrate these zones are usually intermediate between the water table and the water level of the Floridan aquifer. Water in the Hawthorn Formation is usually hard, low in color and iron, and pro-




PIEZOMETRIC
SURFACE NON-FLOWING
200'- WATER AR AE ARTESIAN WELL SAND TA E.-CHARGE AREA.E DISCHARGELIETN
APOPKA LAND WATER TAB L WING AREA
APOPKA.. LAND L E FLOWING
100' R ARTESIAN WELL LIMESTONE SEA RFACE SAND AA A A LEVEL ^^
-o AWTHORN FORMATIO MARL
-200' CLAY
-300
DOLOMITE
-400'
0 5 10 20 30 MILES
SHELL
Figure 4. Block diagram of Orange County.




tected from pollution by surrounding, relatively impermeable beds.
The principal water-storage reservoir in Orange County is the Floridan aquifer which underlies all of Florida and parts of Georgia, South Carolina, and Alabama. In Orange County this ground-water reservoir is more than 1,300 feeoot, thick and is composed, generally, of limestone and dolomitic limestone. The depth to the top of the aquifer ranges from about 50 foot below the land surface in parts of western Orange County to about 350 feet in the southeastern part of the county. Solution channels and pore spaces in the limestone range in diameter from a fraction of an inch to more than 200 feeoot. Yields of 4,000 gpm (gallons per minute) or more can usually be obtained from large diameter (20 inches or more) wells drilled into the Floridan aquifer.
The water in the Floridan aquifer is artosian, which means it, will rise above the top of the aquifer in a penetrating well. The imaginary surface that coincides with the water level in a well in an artesian aquifer is called the piezomotric surface. The piezometric surface ranges from more than 100 fooeet, below the land surface (non-flowing areas) in high areas in the western part, of Orange County, to more than 15
EXPLANATION N
DEPTH TO TOP OF FLORIDAN
AQUIFER, FEET BELOW LAND SURFACE
0 to 100
10010 to 200
[] 200 to 300
MORE THAN 300
O 5 10D t MILES
Figure 5. Depth to top of Floridan aquifer.




EXPL ANATION DFPTH TO PIEZOMETRIC SURFACE,
FEET BELOW LAND SURFACE N MORE THAN 80
60 to 80
40 ro 60
1 20 to 40
o to 20
ARTESIAN FLOW AREA
0 ~ 5 ,0 =t .f
Figurt, 6. I'iezometric surface. of the Floridan aquif.
feet above the land surface (flowing areas, the St. Johns River valley in the extreme tern part of the county.
The piezometric surface is highest in southwestern part of the county and sic downward to the northeast and east. Grr water moves down gradient in a direction gt rally at right angles to the piozomotric cont
E XPL ANATION
.,, , N,t ",t Atlt
,-)rvit. N ,tk. Or.,
Figure 7. Altitude of piozonmotric surface at avorag( conditions.




The mineral content of the water in the oridan aquifer is lowest in the western part the county and increases toward the east. t of the increase is due to solution of the stone as the water moves slowly eastward ard the sea, however, most of the increase ably is caused by residual saline water that red the aquifer when the seao last, covered
nge County.
EXPLANATION N
DISSOLVED SOLIDS,
PARTS PER MILLION
[ LESS THAN 150
F 150 300
1000-2000
a MORE THAN 2000
0 5 10 MILES
i I . ILE
ro 8. D)issolvocd solids in water from the Floridan aquifer.
Except for the salt water in the eastern of the county and highly colored water in
s of the water-table aquifer, ground water is able for domestic, irrigational, and most istrial purposes. The principal dissolved stituents in water in Orange County are: Ia, calcium, magnesium, sodium, chloride,
fate, and bicarbonate.
HOW IS WATER USED?
Use of water in Orange County is increasing at a rapid rate. In 1965 the total use was about 100 mgd exclusive of water used for electric power generation. About 30 mgd of the water used was consumed--evaporated or incorporated in a product. All water for municipal, industrial, and domestic supplies and about half the water




50
rr I
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a: 40
W
a- REPORTED
z PROJECTED
0
_j
_J 30
LL
co
z
o 20
01
D O
U)
a:
w
02
1920 1940 1960 18
Figure 9. Water use in Orange County.
used for irrigation in Orange County came from ground-water sources--primarily the Floridaaquifer. Total ground-water pumpage was appro. ximately 80 mgd. This amount included 11 mg? that the City of Cocoa and vicinity including Cape Kennedy, NASA, and Patrick Air Force Base drew from ground-water reservoirs ii eastern Orange County. The water in the Flor idan aquifer underlying Brevard County is gen erally too highly mineralized for most uses Lakes and ponds in Orange County provide water for irrigation, but the largest uses a surface water are for recreation and cooling fo




Photo U S. Soil Conservoation Service
Figure 10. Citrus grove irrigation in Orange County.
electric power generation. The 1,100 lakes and ponds in the county constitute a valuable resource. Many are used for boating, swimming. fishing, skiing, and other recreational activities. They also moderate the surrounding air temperature and attract a great number of tourists to Orange County. Lakes have played a large part in establishing Orlando's reputation as one of the 10 most beautiful cities in the country.
.. 7
Photo Orlando Area Chamber of Commerce
Figure 11. Water for recreation.




Streams in Orange County are used for fishing, boating, and swimming; however,- most of the streams go dry during droughts.
WHAT ARE THE WATER PROBLEMS?
In 1960 many homes were flooded by high lake levels. In 1962 the docks of some lakefront homes were left high and dry by low lake levels. These extremes illustrate one of the major surface-water problems in Orange County-too much water during wet periods and not enough during dry periods.
Photo U S Soil Conservotion Service
Figure 12. Flooding in 1960.
More than 300 drainage wells have been drilled in Orange County since 1906 to drain excess surface water and to dispose of waste. Prior to 1950, raw sewage and citrus pulp were put into the Floridan aquifer. Such practices have been outlawed, but the quality of the water entering drainage wells is not easily controlled or regulated. Some parts of the Floridan aquifer are still subject to pollution. Some streams and lakes receive treatment plant effluent and other contaminants. The continued increase in need




or water calls for increased attention to areavide water planning and conservation.
WHAT ABOUT THE FUTURE?
At present (1968) there is more than enough vater entering the ground-water reservoirs in )range County to meet all demands and to still naintain flow in the springs and flow of ground vater into Seminole, Brevard, and Lake coun;ies. If recharge to the Floridan aquifer is siglificantly reduced by urbanization and by diversion of water to the sea, and if water use in the region continues to increase, increasing attenion will need to be given to conservation and water developmental measures to satisfy the demand for fresh water.
A tremendous amount of water is stored underground, but long-term withdrawal of more water than enters the aquifer promotes problems. Excessive withdrawal lowers water levels and invites intrusion of salt water from the ocean or from greater depths in the aquifer. Pollution of the water also impairs its usefulness. Lowering of artesian levels tends to promote formation of sink holes.
WHAT CAN BE DONE?
Accurate information, sound planning, and farsighted land-use management are the keys to most of the water-management problems of Orange County.
Much of the flood damage to homes and other property can be avoided by recognizing that lake levels naturally rise and fall in response to variations in rainfall. If the flood plains of lakes are kept in their natural state or are developed in- such a manner that the developments will not be greatly harmed by high water, damage can be minimized and water can be saved from wet periods for use during droughts. To do this, it is necessary to know the expected high-water stage of the lakes and to develop only land safe from flooding. Removal of deve-




lopment in most settled areas is probably not! practical, but in some cases the best interests of the county may be served by removing homes that are subject to flooding.
Surplus surface water can be a blessing in disguise if managed properly. Research can probably devise an economically feasible plan whereby surplus surface waters can be collected, treated if necessary, and then stored underground for later use. Drainage wells, which now are a hazard because of pollution, could thus be converted into recharge wells, whicl would preserve and enhance the water resources of the region.
The pollution problem increases as popu. lation density increases. However, modern methods of sewage can usually purify water to the stage where it safely can be put underground or into streams and lakes. In the long run, treatment of waste water before it enters streams and lakes may be less expensive than trying to solve the problems created by pollution of surface-water bodies.
The need for water in the distant future cannot be definitely foreseen. However, the population will undoubtedly continue to increase and it is safe to assume water needs will also continue to increase until much of the available water is used. Annual rainfall in Orange County varies considerably--extremes are 40 inches in 1943 to 69 inches in 1960--whereas evapotranspiration losses remain relatively constant. One year of above average rainfall provides many times the volume of recharge to the water reservoirs than does a year of below average rainfall. As below average years of rainfall occur mor< than twice as frequently as above average years (48 below and 27 above in the past 75 years ol record), the importance of the years of floods is evident.
The rolling highlands of western Orange County absorb almost all the rainfall that does not evaporate. Preservation of this region in itE natural state or improving its recharge capacit. is important. This can be done by guidin_




uture urban and industrial expansion to the astern areas of the county and preserving the vestern highlands for agricultural use. This permits recharge and at the same time yields high rate of return through agri-business.
Surface drainage is sluggish in the eastern art of the county because of the flat terrain, nd downward movement of water is slow beause of the relatively impermeable sub-strata. Vater control must be provided before this area an be developed. If excess surface water is .ollected, treated, and allowed to recharge ,he Floridan aquifer through wells, water sup)lies will increase, the danger of salt-water ntrusion will decrease, and development of the irea will be aided. Collection, treatment, and 3torage of all excess surface water in the county nay not now be feasible, but such a goal is vorthwhile.
WHAT ABOUT
EMERGENCY WATER SUPPLIES?
Citizens of Orange County need not be Dverly concerned with contamination of the ground-water supply by radioactive fallout except those whose wells are subject to contamination by drainage wells. The water stored underground is protected from immediate contamination, whereas the water above ground in streams and lakes would be immediately exposed to radioactive fallout. The artesian aquifer is at least 50 feet below land surface and would probably not be contaminated. Water taken directly from an uncontaminated artesian well would be safe to drink during or after radioactive fallout.
HOW WAS THE WATER
RESOURCE MEASURED?
The measurement of Orange County's water resources involves many complex operations. The services of experienced geologists, engi-




neers, and chemists were necessary to measure and study the many variables in water quantity, quality, and movement.
In order to obtain information on Orange County's underground water, many existing wells were studied and tested and where necessary test wells were drilled. Drill cuttings were examined and water samples were analyzed for their chemical content. Water levels were measured to determine seasonal and long-term changes and pumping tests were conducted to obtain a knowledge of the ability of the aquifers to transmit and store water. The amount of water stored in the aquifers was estimated using geologic and well and pumping-test information.
The quantity and quality of surface water changes more rapidly and frequently than the quantity and quality of ground water. Continuous records or many measurements of the physical and chemical characteristics of streams and lakes are necessary in order to obtain extremes, frequencies, and averages.
The stage (water level) of some streams in the county was measured continuously; and, for some streams and lakes, periodic stage measurements were made. Several stream discharge measurements were made at each gaging site and a stage-discharge relation was defined. By using a continuous record of stage and the stage-discharge relation, a continuous discharge was computed.
Many water samples from streams and lakes were analyzed for dissolved chemical constituents in order to define the ranges, trends, and averages in water quality.




WHERE CAN MORE INFORMATION
BE OBTAINED?
Additional information on the water resources of Orange County is contained in the ollowing reports of the Florida Geological survey prepared by the U.S. Geological Survey n cooperation with Orange County and the )ivision of Geology, Florida Board of Conservaion:
Ground Water conditions in Orlando and vicinity, Florida: Fla. Geological Survey Report of Inv. No. 5, by A.G. Unklesbay.
Interim Report on the Water Resources of Orange County, Florida: Fla. Geological Survey Inf. Circ. No. 41, by W.F. Lichtler, Warren Anderson, and B.F. Joyner, 1964.
Water Resources of Orange County, Florida:
Fla. Geological Survey Report of Inv. No. 50, by W.F. Lichtler, Warren Anderson, and B.F. Joyner, 1968.
Control of Lake Levels in .Orange County, Florida: Fla. Geological Survey Inf. Circ. No. 47, by Warren Anderson, W.F. Lichtler, and B.F. Joyner, 1965.
Availability of Ground Water in Orange County, Florida: Fla. Geological Survey Map Series No. 21, by W.F. Lichtler and B.F. Joyner, 1966.
Availability and quality of surface water in Orange County, Florida: Fla. Geological Survey Map Series No. 24, by Warren Anderson and Boyd F. Joyner, 1966.
Water Resources records of Orange County, Florida: Fla. Geological Survey Inf. Circ. No. -by W.F. Lichtler, Warren Anderson, and B.F. Joyner, in preparation.
Surface and quality of water records of Florida:
prepared annually by the U.S. Geological Survey.




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UF00001176.pdf
METS2 unknownx-mets 7e16ba8acab4d89dc9ee7979d5f15148 23326
UF00001176_00001.mets
METS:structMap STRUCT1 physical
METS:div DMDID ADMID ORDER 0 main
PDIV1 1 Cover
PAGE1 Page
METS:fptr FILEID
PAGE2 2
PDIV2 Main
PAGE3
PAGE4
PAGE5 3
PAGE6 4
PAGE7 5
PAGE8 6
PAGE9 7
PAGE10
PAGE11 9
PAGE12 10
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STRUCT2 other
ODIV1
FILES1
FILES2