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1985 September 8, 1986 <br />Capacity Total Capacity Capacity Total Capacity <br />Elevation (Ac-Ft) (Ac-Ft) Ac-Ft) (Ac-Ft) <br />6566.G <br />-- -- 0.27 0.27 <br />6568.0 <br />6570,0 <br />6572,0 <br />6574,0 <br />6576,0 <br />0.59 0.59 0.68 0.95 <br />94 1.53 0.94 1.89 <br />1.20 2.73 1.20 3.G9 <br />1.46 4.55 <br />0.94 5.13 0.94 5.49 <br />6577,1 <br />0.84 5,97 0.84 6.33 <br />6578,0 <br />6580,0 <br />2.02 7.99 2.02 8.35 <br />At the principal spillway elevation of 6577.10, the 1985 sediment storage capacity was <br />5.13 ac-ft; whereas the September 8, 1966 sediment survey indicates a sediment storage <br />volume of 5.49 ac-ft. The difference in sediment storage of +0.36 ac-ft is primarily the ., <br />result of several survey shots being taken at locations in the ponding area that were <br />tower than the survey shots taken in 1985. This is indicative of the survey methods which <br />are required when a pond contains rvater. It is very difficult to find the low and high <br />points under water from one year to the next. <br />Based on the updrainage watershed characteristics, one 70-year, 24-hour precipitation <br />event would generate 0.05 ac-ft of sediment using M.U.B.L. E. <br />The equivalent of the sediment generated from approximately 110 10-year, 24-hour <br />precipitation events could be stored beneath the principal spillway elevation based on the <br />1986 sediment survey. This is a conservative amount of sediment storage; therefore, no <br />remedial sediment clean-out work is scheduled for the five-year permit term at this time. <br />G-4 <br />