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The sedimentation yield analysis assumed a very active <br />revegetation program will be utilized to minimize sediment l <br />yields, This will be an ongoing process during the construction <br />of each phase. . <br />The CMLRB requires that the outlet structure for the <br />sedimentation pond be able to handle the peak discharge from a <br />25-year, 24-hour storm. The 25-year peak flow for the new <br />proposed waste pile was determined based upon the following <br />parameters: <br />Curve No. 75 <br />Total Runoff 0.48 inches <br />Time of Concentration = 0.15 <br />Table 6.4 states the peak 25-year, 24-hour discharge which will <br />occur for each phase. <br />The existing outlet structure is composed of two inlet structures <br />along a 24-inch corrugated metal pipe. The first inlet portal <br />consists of a 12-inch valve at Elevation 6107: The inlet was not <br />analyzed for discharge capability since the valve is used <br />strictly for drainage purposes only. The upper emergency <br />spillway outlet consists of a 24-inch CMP opening at Elevation <br />6109, with a final dike elevation of 6111. <br />A hydraulic study was performed using wier and orifice equations <br />to determine the inlet capacity of the system and Bernoulli's <br />24 <br />