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• Design Calculations <br />Hvdrologv <br />Hydrology Inputs <br />Pond 1 Drainage area is shown on the Drainage and Sediment Control <br />Map (Map 20). The drainage area is divided into the following <br />subwatersheds: <br />• JBS 111/SWS 1 The coal stockpile area which drains to <br />diversion ditch CD-2 <br />• JBS 111/SWS 2 The coal stockpile area which drains to <br />diversion ditch CD-3 <br />• JBS 111/SWS 3 The east part of the facilities area <br />All hydrology inputs for subwatersheds are shown on Table 2, SEDCAD+ <br />Version 3.0, Pond 1 and Associated Structure. <br />The CN numbers used for Pond 1 watershed were obtained from Procedures <br />for Determining Peak Flows in Colorado and technical Release No. 55 <br />(USDA-SCS, 1980). Based on soil type and vegetation cover, curve number <br />were determined using Table 2-2a and 2-2d, USDA-SCS TR55, for the <br />following conditions: <br />Undisturbed <br />Soil Type: B <br />Ground Cover: <br />Cover Type: <br />CN: 75 <br />Disturbed <br />Soil Type: B <br />Ground Cover: <br />CN: 82 <br />• <br /><30%, Poor <br />Pinyon, Juniper <br />Dirt Road <br />14 R Revised - December, 1991 <br />