Estimates of water flow needs of the Military Grade

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Estimates of water flow needs of the Military Grade

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Estimates of water flow needs of the Military Grade
Gray, Paul N.
Publication Date:
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Box 2


Subjects / Keywords:
Ranchers -- Law and legislation -- Florida
Okeechobee, Lake (Fla.) ( lcsh )

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Source Institution:
University of South Florida
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University of South Florida
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The University of South Florida Libraries believes that the Item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. The Item may not be in the Public Domain under the laws of other countries.
Resource Identifier:
035069031 ( ALEPH )
981477171 ( OCLC )
L41-00066 ( USFLDC DOI )
l41.66 ( USFLDC Handle )

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University of South Florida

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Estimates of water flow needs north of the Military Grade by Paul Gray, Ph.D., Manager, Kissimmee Prairie Sanctuary, 8-1-96 The annual evaporation and plant transpiration of water in this area is roughly 35" per year. Our rainfall is roughly 50" per year, yielding an average surplus of 15" of water that must exit through runoff or percolation. Because this area is underlain with a hardpan, very little percolation occurs. If we assume 20% percolates, we need 12" of runoff per year. One square mile then generates about 27,878,400 cubic feet of runoff water. If the Fish Slough drainage area north of the Military Grade is 8 square miles (I think it is 10-12) , we must run 223,027,200 cubic feet off per year, or 611,033 cubic feet per day. That translates to 7.1 cubic feet per second average flow over the year. However, because about 60% of our rain falls in the wet season, about 4 months, we actually need a wet season conveyance capacity of 1,115,136 cubic feet day (total runoff* 60% / 120 days) or 12.9 cubic feet per second on average. Therefore, 12.9 cubic feet per second is an estimate for a "natural" runoff rate during the wet season in normal years. However, water management designs must be designed to handle extreme events--not just averages. This area can get as much as 80 inches of rain (such as in 1995). In such a case, capacity would need to handle 40 inches of runoff in the year (80"-[5" percolation+ 35" evapotranspiration]). Then capacity would have to be about 43 cubic feet-per second during the wet season (assuming the same wet/dry season ratios). My measurements of the 18" culvert estimate a maximum capacity of 5 cubic feet per second. The two 24" pipes in Tiger Cattle Company's part of the Military Grade (Section 9) probably can convey about 10 cubic feet per second each. Therefore, total MAXIMUM conveyance through the Military Grade at this time is about 25 cubic feet per second--or about 60% of the 43 cubic feet that are needed. Further, another 24" pipe still would leave us at only 80% of what these estimates indicate is needed. Of course, if the drainage area is larger than my estimates, then the disparity between capacity and need is GREATER than estimated above.


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