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Hydrolocrv <br />r~ <br />L <br />Hydrology Inputs <br />The Pond L1 drainage area is shown on the Loadout Area Surface <br />and Groundwater Hydrology Map (Map 13) .The drainage area is <br />divided into the following two subwatersheds: <br />• JBS 111/SWS 1 East Loadout East Side (Perimeter Ditch <br /> Section 1 and 2) <br />• JBS 111/SWS 2 East Loadout West Side (Perimeter Ditch <br /> Section 3 and 4) <br />• JBS lii/SwS 3 Disturbed area south of tracks <br />• JBS 111/SwS 4 Undisturbed area south of tracks <br />All hydrology inputs for subwatersheds are shown on Table 23 a, <br />SEDCAD+ Version 3.0, Pond L1 and Perimeter Ditch. <br />• The CN numbers used for Pond L1 watershed were obtained from <br />Procedures for Determining Peak Flows in Colorado and Technical <br />Release No. 55 (USDA-SCS, 1980). Based on soil type and <br />vegetation cover, curve numbers were determined using Table 2-2a <br />and 2-2d, USDA-SCS TR55, for the following conditions: <br />Undisturbed <br />Soil Type s <br />Ground Cover: < 30~, Poor <br />Cover Type: Pinyon - Juniper <br />CN: 75 <br />Disturbed <br />Soil Type S <br />Ground Cover: Gravel <br />CN: 85 <br />r1 <br />U <br />Hydrology Results <br />Peak Discharge <br />10-year, <br />25-year, <br />e:\860TR-21 <br />05/19/95 3:13pm kep <br />24-hour event <br />24-hour event <br />171 <br />13.80 cfs <br />16.10 cfs <br />Revised - May 1995 <br />