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• <br />SEDCAD4 <br />WATERSHED ID <br />Structure 21 - SWS2 <br />PECOCO Pond <br />Postmine Design <br />Watershed Area: <br />2.1 <br />Curve Number: <br />WATERSHED TYPE GROUND COVER I SOIL GROUP NUMBER ( acres) <br />Pond Surface n/a n/a 100 2.1 <br />Total <br />2.1 <br />CURVE NUMBER <br />IUU <br />SEDCAD 4 <br />WATERSHED ID <br />Structure 21 <br />PECOCO Pond Spoil Spring Inflow <br />Postmine Design <br />Watershed Area: <br />n/a <br />Curve Number: <br />WATERSHED TYPE <br />GROUND COVER <br />SOIL GROUP <br />NUMBER (acres) <br />Inflow <br />n/a <br />n/a <br />na/ n/a <br />Total <br />n/a <br />PECOCO Spoil Spring is the perennial discharge from the pond. The average flow rate for the <br />PECOCO discharge is 40 gpm (0.15 ac- ft/day). The permanent pool elevation for PECOCO <br />was set at 6775.65 feet as a model input value to account for the constant spoil spring inflow. <br />CURVE NUMBER n/a <br />Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the <br />Seneca If Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming <br />Drainage Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55), <br />Soil Conservation Service, 1986. <br />2.05.3 -E2. H.45 <br />Revised 12/09 <br />Peabody Sage Creek Mine <br />PM -1 System Channel Designs <br />HYDROLOGIC INPUT PARAMETERS <br />