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Land Flow Vertical Horizontal Slope Velocity Time <br /> <br />Condition _ <br />____Dist (ft)____ <br />______Dist_(ft2_ <br />_______ <br />_iXZ________ <br />__(fes)_____ O <br />____(hr)_ <br />2 382 2300 16.61 2.04 0.314 <br />5 130 1280 10.16 3.19 0.112 <br />6 30 720 4.17 3.06 0.065 <br /> Total Time of Concentration 545-1 0.490 <br />2 315 1800 17.50 2.09 0.239 <br />5 250 2040 12.25 3.50 0.162 <br /> T o[al Time of Concentration sus-2 0.401 <br />2 380 2200 17.27 2.08 0.294 <br />6 160 1720 9.30 4.57 0.104 <br /> Total Time of Concentration 545-3 0.399 <br />Sedimentoloav. The SEDCAD computer program was also utilized to calculate the sediment <br />flowing into and through the principal spillway using the DEPOSITS portion of the program. <br />The results show there was no sediment flowing out of the pond as a result of the 10-year, <br />24 -hour storm (1007. Basin Trap Efficiency). <br />The Revised Universal Soil Loss Equation (RUSLE) was used to determine the sediment <br />loading to the pond to estimate sediment storage and frequency of cleanout. <br />Tons/AC/ <br />Condition Area (ac.) R K LS C P __Year _ Tons/Year <br />Undisturbed 130.2 30 0.25 8.8 0.003 1.0 0.198 25.8 <br />Disturbed. _ 159_6 __ 30 0.19 8.8 0.586 1.0 29.39 _4y691 _2_ <br />Total 289.8 ~ 4,717.0 tons/yr <br />Includes roads, topsoil removed areas, and pit/spoil areas. <br />4,717.0 tons/year x bOX delivery ratio = 2,830.2 tons/year <br />Based on sediment density of 80 lbs/cu ft this amounts to 70,755 cu ft/yr or 2,620 cu <br />yds/yr or 1.62 ac-ft per year. The amount of estimated sediment storage is 5.8 ac-f[ or <br />3.6 years of sediment storage. The cleanout level is 60X of capacity. Therefore when the <br />sediment volume reaches 3.5 ac-ft, the pond will be cleaned out. <br />Particle Size Distributions. The particle size distribution for this sedimentation pond <br />was based on sieve and hydrometer analysis of various sail types in the Seneca II-4 permit <br />13-3-8 Revised 03/13/92 <br />