Laserfiche WebLink
TABLE 4 <br /> Weighted Curve Number (CN) <br /> Vegetation Hydrologic Area <br /> Cover Soil Group CN (Acres) CN (x) Area <br /> Juniper-Grassland D 89 0.34 30.3 <br /> Reclaimed C 81 7.35 595.4 <br /> TOTAL 7.69 625.7 <br /> Weighted CN = Total (CNX Area) = 625.7 = 81.4 Use 82 <br /> Total Area 7.69 <br /> TABLE 5 <br /> Hydrologic Area <br /> Soil Type Soil Group "k" Factor (Acres) "k" (x) Area <br /> 9904/D-2 D 0.22 0.34 0.075 <br /> Reclaimed C 0.25 7.35 1.838 <br /> TOTAL 7.69 1.913 <br /> Weighted "k" Factor = Total ("k" x Area) = 1.913 = 0.249 Use 0.25 <br /> Total Area 7.69 <br /> Precipitation and Storm Type <br /> Precipitation depths for the 10-year, and 25-year storms were developed <br /> using procedures and data published in the Soil Conservation Service <br /> publication "Procedures for Determining Peak Flows in Colorado". A <br /> standard SCS Type II storm was utilized for each analysis. <br /> Unit Hydrograph and Surface Condition <br /> The SEDIMOT II computer program provides three unit hydrograph shapes to <br /> choose from in determining the runoff characteristics of a watershed. <br /> The disturbed hydrograph (No. 1) was used for disturbed and reclaimed <br /> areas. <br /> 6 <br />