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n <br />0 <br />TABLE 1, PART A <br />NRCS'CURVE NUMBERS <br />COVER <br />COVER TYPE <br />HYDROLOGIC <br />PERCENT <br />HYDROLOGIC <br />CURVE <br />COVER <br />COVER TYPE <br />CONDITION <br />COVER <br />SOIL GROUP <br />NUMBER <br />Disturbed <br />Topsoil <br />Bare <br />N/A <br />C <br />91 <br />Undisturbed <br />Stripped <br />Good <br />85 <br />41 <br />57 <br />Undisturbed <br />Mountain <br />Good <br />85 <br />C <br />41 <br />Brush <br />Good to Fair <br />50-85 <br />41 <br />57 <br />Juniper <br />Fair <br />30 -70 <br />C <br />73 <br />Sagebrush <br />Fair <br />50 <br />C <br />63 <br />Source: NRCS TR -55 Urban <br />Hydrology for Small Watersheds (June 1986) <br />TABLE 1, PART B' <br />SCS CURVE NUMBERS <br />COVER <br />COVER TYPE <br />HYDROLOGIC <br />PERCENT <br />CURVE <br />CURVE <br />CONDITION <br />VEG. <br />NUMBER, <br />NUMBER, <br />COVER <br />HISTORIC <br />CURRENT <br />Undisturbed <br />Mountain <br />Good <br />85 <br />41 <br />57 <br />Shrub <br />Oak -Aspen <br />Good to Fair <br />50-85 <br />41 <br />57 <br />Sagebrush <br />Good <br />85 <br />47 <br />47 <br />Sagebrush <br />Fair <br />50 <br />63 <br />63 <br />Disturbed <br />Topsoil <br />Bare <br />N/A <br />91 <br />85 <br />Stripped <br />Reclaimed <br />Topsoiled and <br />Bare <br />N/A <br />86 <br />83 <br />Seeded <br />1 to 2 Year <br />Fair — Good <br />25 -45 <br />61 <br />77 <br />Growth <br />3+ Year <br />Fair — Good <br />70 <br />56 <br />74 <br />Growth <br />Sources: SCS TR -55 Urban Hydrology for Small Watersheds June, 1986 <br />Also see Tables 7 and 8 for additional support of curve numbers provided. <br />Curve numbers presented in the historic column represent previously agreed upon <br />values between DRMS and Colowyo. Other values within the "current" column <br />represent typical values that may be used for site specific conditions based on the <br />judgment of the design engineer. <br />All current curve numbers are based on hydrologic Soil Group C. <br />Exh. 7 -23 -3 Revision Date: 12/15/10 <br />Revision No.: PR -03 <br />