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Table 1 <br />Gully <br />Volume lost <br />W CR 92 <br />1561 yd <br />E CR 92 <br />8712 <br />E Pit drainage <br />4064 <br />Toe Chen's Hill <br />548 <br />E Pit large gully <br />1386 <br />Total <br />16271 yd <br />The remainder of the gullies were located at their approximate mid portions, measured for width, <br />depth, and length to calculate the volume lost. Since there is no definite demarcation between the <br />West and East Pits, a total volume lost for the two pits was calculated as shown in Table 2. <br />Table 2 <br />Area Volume lost <br />Chen's Hill 4672 yd' <br />West and East Pits 4605 <br />Total 9277 yd' <br />The total amount of sediment lost shown by this survey is 24,162 yd3. There were no sediment ponds <br />for the drainage from the West and East Pits, and only Chen's Hill had protection by Pond A for about <br />the first two years that it functioned before filling completely. For many years the dam for Pond A has <br />been eroded, and Pond A now is even contributing sediment to the drainage flow as the contained <br />sediment is eroding and head cutting. <br />Photo 1. Pond A destroyed dam and head cutting of sediment. <br />The average sediment loss per year is approximately 1,000 yd3. To give another comparison, the total <br />sediment loss is equal to about 1,200 semi -truck loads of dirt, and the annual sediment loss is equal to <br />