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• sediment yield cannot be accurately determined. Therefore, ten (10) <br />percent additional storage volume is provided in the south cell of <br />Sedimentation Pond No. 1 and provisions are made to clean the pond <br />when 60 percent of the allowable sediment volume is achieved. <br />Sediment Volume = (2.09 acre-feet) x 0.10 <br />= 0.21 acre-feet <br />Required Storaoe Capacity <br />Storage Capacity = 10-year, 24-hour runoff volume + Sediment Volume <br />+ Permanent Pool <br />= 0.76 acre-feet + 0.21 acre-feet + .70 acre-feet <br />= 1.67 acre-feet <br />(Refer to the Sedimentation Pond No. 1 Design Map, (Map 21), for the <br />Stage/Storage Curve and Storage Capacity Table). <br />• Soillwav Design <br />Pond 1 has the capacity to contain the 25-year, 24-hour event with no <br />discharge. <br />• <br />15 R Revised - December, 1991 <br />