Laserfiche WebLink
' 6.2.3 Basin 6 <br /> Basin 6 lies northeast of the pit and contains approximately 375 <br /> acres. Currently the basin flows through several small catchment basins <br /> ' before eventually reaching the northeast corner of the pit. No well <br /> defined flow path exists and this has probably caused the numerous eroded <br /> gullies in the northeast corner of the pit. The HEC-1 run for a 100-yr. , <br /> ' 1-hr. storm showed a peak flow of 92 cfs and a runoff volume of 11 acre <br /> feet. Umetco proposes to construct Ditch B on the uphill side of the road <br /> ' just above the pit. <br /> Ditch B will divert the flow into two detention ponds, Ponds A and B, <br /> that were previously required for flows from Basins 2 and 3. These ponds <br /> are located northeast of the pit. The ditch cross-section and riprap <br /> requirements are grade dependent and vary as shown on the plans. The <br /> ' combined storage capacity of the two small ponds is currently 5 acre feet. <br /> In order to achieve 11 acre feet of capacity, the dikes and spillways on <br /> Ponds A and B will have to be raised 3.4 feet and 2 feet respectively. <br /> 1 The pond dikes will still be less than 10 feet high and therefore will not <br /> be subject to the State Engineer's criteria or jurisdiction. <br /> ' -17- <br />