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<br />Weighted Average CP = 71,8717 = 0,164 ' <br />438.55 - <br />* i <br />Based on vegetation type discussed in Tab 10. <br />Storage Capacity ' <br />The storage capacity of Sediment Pond 009 was also analyzed using the S_EDCAD computer <br />program. Results of the SEDCAD model ash ow the storm runoff volume from the 10-year, <br />24-hour precipitation event to be 3.46 ~c-ft. The ponding area is designed to store 9.4 <br />ac-ft of sediment. There will 6e no discharge through the emergency spillway during the <br />10-year, 24-hour storm event. In addition, there will be adequate freeboard (3 ft.) in <br />the emergency spillway to the top of embankment during the 25-year, 24-hour storm event. <br />Table 13-5-6 is a summary of the designed storage capacity. <br />TABLE 13-5-6 <br />Design Storage Capacity Sunmary <br />Pond 009 <br />Capacity <br />Elevation Stage (Ac.-Ft.) <br />Description <br />7073 0 0.00 <br />7086.5 13.5 9.4 <br />7087,0 14 9.9 <br />7090 17 13.6 <br />7091 18 15.1 <br />7094 21 19.8 <br />Bottom of Pond Excavation <br />100Po Sediment Storage, and <br />Elevation of Principal Spillway <br />10-Yr, 24-Hr. Peak Stage <br />Crest of Emergency Spillway <br />25-Yr., 24-Nr. Peak Stage <br />Top of Embankment <br />Peabody does not anticipate any other inflow to the pond at this time. The principal <br />spillway will be nonclogging and will automatically dewater the ponding area to maintain <br />the design capacity for the runoff volume for a 10-year, 24-hour storm event. Any <br />additional dewatering required will be done by pumping the water out of the pond and using <br />it for either dust suppression or transporti rg it to another pond for treatment, or <br />discharging the water according to the approved Colorado NPDES permit. <br />Spillways <br />Sediment Pond 009 will have two separate spillways; a principal and an emergency, Please <br />• <br />• <br />• <br />13-8-8 <br />