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DESIGN ANALYSIS <br /> GENERAL <br /> Sedimentation Pond 005 was evaluated 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 /> 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 /> 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 />