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SEDIMENT CONTROL -TIPPLE AREA <br /> <br />Two ponds are located in the tipple area - the west pond (pond A) to con- <br />trol runoff from the emergency coal storage area and the truck dump, and <br />the east pond (pond B) to control runoff from the conveyors, crushers, and <br />train loadout area. The ponds and their storage -discharge curves are <br />shown in figures 1-3. <br />Design criteria are shown below: <br />Pond A Pond B <br />Area (Acres) 10.9 acres 30.2 acres <br />Soil Type (Class) Routt (c) Routt (c) <br />Land Use (c n) Dirt Road (87) Dirt Road (87) <br />• Flow Length (ft) 750 2100 <br />Elevation Change (ft) 10 45 <br />Tc 0.08 hrs (4.8 min) 0.22 hrs (13 min) <br />Required Pond Capacity <br />10 yr 24 hr runoff (1.8" rainfall) <br />1.8" rainfall = 0.75" runoff <br />0'75 x acres = acre ft capacity 0.68 acre ft 1.89 acre ft <br />12 <br />Peak Flow <br />25 yr 24 hr storm (2.1" rainfall) <br />Use moderate slope, type II storm 18 cfs/in 32 cfs/in <br />• <br />