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Design Calculations <br />• <br />• <br />u <br />Hvdroloay <br />Hydrology Inputs <br />The Pond 5 Drainage area is shown on the Drainage and Sediment Control <br />Map (Map 20). The dr ainage area is divided into the following <br />subwaters heds: <br />• JBS 111/SWS 1 Area north of the access road <br />• JBS 111/SWS 2 The access road <br />• JBS 112/SWS 1 The area north of the county road <br />• JBS 121/SWS 1 West part of the facilities area which drains <br /> to CD-1 <br />• JBS 121/SWS 2 Middle part of the facilities area which drains <br /> to the yard area catch basin <br />• JBS 211/SWS 1 The area north of the county road <br />• JBS 221/SWS 1 The area surrounding Pond 5 <br />All hydrology inputs for subwatersheds are shown on Table 11, SEDCAD+ <br />Version 3.0, Pond 5 and Associated Structures. <br />The CN numbers used for Pond 5 watershed were obtained from Procedures for <br />Determining Peak Flows in Colorado and Technical Release No. 55 (USDA-SCS, <br />1980). Based on soil type and vegetation cover, curve numbers were <br />determined using Table 2-2a and 2-2d, USDA-SCS TR55, for the following <br />conditions: <br />Undisturbed <br />Soil Type: E <br />Ground Cover: <br />Cover Type: <br />CN: 75 <br />Disturbed <br />Soil Type: E <br />Ground Cover: <br />Cn: 82 <br /><30Y, Poor <br />Pinyon, Juniper <br />Dirt Road <br />76 R Revised - December, 1991 <br />