Hoover-Thompson - 1991-12-20

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Hoover-Thompson - 1991-12-20

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Hoover-Thompson - 1991-12-20
Publication Date:
Physical Location:
Box 2


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

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Source Institution:
University of South Florida
Holding Location:
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 )
L41-00083 ( USFLDC DOI )
l41.83 ( USFLDC Handle )

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University of South Florida

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Hoover, Thompson & Associates, Inc. En1ineerin1, Land Suneyin1, .k Plannin1 P . O. Box 2217 • Okeechobee, Florida 34973 • Phone: (813) 763-8999 December 20, 1991 Mr. Loris Amussen South Florida Water Management District 3301 Gun Club Road (P.O. Box 24680) W. Palm Beach, FL 33416-4680 Re: Haynes Williams Citrus Application No. 901231-53 Okeechobee County, S 5,6,7,&8/T 34 S/R34 E Dear Mr. Amussen: In response to your request for additional information on 2 items of application 901231-53, we offer the following information: 1. An estimate of the seepage through the military grade has been performed to determine if the proposed construction would have a negative effect on the adjacent land owner to the north. The seepage as compared to the potential generation of excess water from the preserve area to the north is relatively insignificant. Cross-sections were taken at three locations on the military grade, north of the proposed grove, and have been plotted with our proposed ultimate sections for your review. Field elevations for all culverts which penetrate the grade have been also been obtained, but were not necessary in the determination of soil seepage. A few auger borings were performed in the military grade and a representative boring at the northeast corner of the site was used in the determination of hydraulic conductivity. This boring produced tan fine sand to a depth of 2.2', slightly cemented brown fine sand to a depth of 3.2', and tan fine sand to a depth of 81 below the top of the grade. The dike's full length was then inspected for signs of any significantly different soil deposits in the ditches or fill portions of the grade. No shell or other indications of a material which would exhibit much greater permeabilities were found. 2. Inflows can take place through 3 culverts under the military grade adjacent to the grove, two 24" CAP's and one 18" CAP, all with riser assemblies. All flows will be routed around the site to Fish Slough uld they occur. An agreement between the National Audubon Society and Mr. Williams dictates that both should be in agreement prior to any discharge. It seems evident that some discharge should take place since rainfall is approximately 14" more than evapotranspiration for the area (Water Resources Atlas of Florida). Two of the three existing culverts are physically damaged and were flowing approximately 1/4 full during our inspection in late November. Robert R. Hoover, R.L.S. • Peter E. "Rett" Thompson, P.E.


. . ... • .. Haynes Williams Citrus Page 2 Estimation of rainfall excess in Audubon's Kissimmee Prairie Sanctuary Average annual evapotranspiration = 36" average annual rainfall = 50" Volume of excess . 11." per year Excess volume= 14" * 1'/12" * 8700 acres (est of Kiss. Prairie San.) = 10150 acre-feet per year = 9,060, 696 gpct \ Kissimmee Prairie Sanctuary's discharge capacity to Sevenmile Slough or other discharge routes are unknown. Estimate of Seepage using Darcy's Law Q = K i A = 0.002973 in/sec* ft/12 in* 3.5/30 * 4 sq ft/Lf = 0.000116 cfs per Linear foot of grade/grove Hydraulic gradient of 3.5/30 is worst case of 6 gradients roughly figured from the cross-sections (Section Cat the military grade). Hydraulic conductivity was estimated using a falling head . testing apparatus. Even though this was a test.of an actual soil sample it was not performed under ASTM procedures or in an approved lab and is only a estimate. 4 sq. ft. flow area estimated flow path based on the surveyed cross-section. Seepage= 0.000116 cfs * 5000 LF = 0.578 cfs = 373,599 gpd (4.1% of water excess in Sanctuary) In conclusion, we have originally felt that seepage volume a11d rate by the proposed construction would cause no adverse impacts to the Kiss. Prairie Sanctuary. This was felt because of the vast inundation exhibited in the Sanctuary in periods of drought. In quantifying the losses from the grove with the natural gains from the lands to the nortl1 we can reasonably assure . against adverse environmental impacts from low water level$. Environmental impacts in from sustained elevated water levels have not be~ri evaluated. Sincerely, Peter "Rett" Thompson, P.E. cc: Mr.Haynes Williams Mr. Scott Hedgen(Manager-Kiss. Prairie S~nctuary)


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