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~l <br />DESIGN ANALYSIS <br />GENERAL <br />Sedimentation Pond 005 was evaiuated and constructed to meet or exceed <br />the design and performance requirements of the CMLRD while utilizing as <br />much of the existing structure and topography as was possible. Pond 005 <br />was constructed to adhere to the following specifications: <br />1. Provide storage for the runoff from the 10-year, 24-hour <br />precipitation event without having any discharge through the <br />emergency spillway (1.13 ac-ft.). <br />2. Provide an emergency spillway capable of passing runoff from <br />the 25-year, 24-hour storm event (1.45 ac-ft.). <br />3. Provide adequate storage for the sediment generated from the <br />10-year, 24-hour (MUSLE) storm event (3.0, 10-year, 24-hour <br />MUSLE storm events or 0:419 ac-ft.). <br />4. Provide a nonclogging dewatering device and principal spillway <br />that will provide adequate detention time for the 10-year, <br />l 24-hour storm event and still allow a method to dewater the <br />• /, pond to the 100 percent sediment storage level in a reasonable <br />amount of time. <br /> <br /> <br />HYDROLOGY <br />The hydrology of the watershed was analyzed by utilizing the SEDIMOT II <br />computer modeling program. In performing this analysis, the <br />characteristics of the minesite and reclamation procedures along with <br />onsite sediment control procedures were considered. Addendums A, B, and <br />C contain complete listings of the SEDIMOT II inputs and outputs for the <br />10-year, 25-year, and 100-year design storms, respectively. Table 1 is <br />a summary of these results. <br />2 <br />