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The LO-year 24-hour frequency storm volumes at each sediment pond were esti- <br />• mated using methods recommended by the SCS (see Table 4). Sediment volumes <br />were estimated by assuming an average annual runoff in the area of 5 inches. <br />This runoff volume was conservatively assumed to have an average annual sedi- <br />ment concentration of 10,000 mg/1. The entire annual sediment volume was <br />assumed to be settled in the pond. The flood volumes and sediment volumes <br />used for the design of each of the sediment ponds are summarized in Table 4. <br />u <br />• 118-7 <br />(Z r~j-l <br />III-20b <br />