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• TABLE 7-6-7-1 <br />DESIGN HYDROLOGY SUMMARY <br />Description 10 Yr. - 24 Hr. Storm <br />Precipitation Depth 1.6 in. <br />Runoff Volume (Total) <br />Old Boneyard 0.06 ac.-ft. <br />New Boneyard 0.14 ac.-ft. <br />Office 0.03 ac.-ft. <br />Peak Discharge Rate <br />Old Boneyard <br />New Boneyard <br />Office <br />0.76 cfs <br />1.7 cfs <br />0.36 cfs <br />Input consists of precipitation amount (inches), watershed areas <br />• (acres), time of concentration (hours), runoff curve number (CN), <br />representative particle-size distribution of soils in the area, <br />sedimentology information, etc. The drainage area for these <br />facilities was measured on a 1" = 100' topographic map. <br />SCS Curve Number and "K" Factor. Curve numbers and "K" factors <br />used for this demonstration are listed in Tables 7-6-7-2, 7-6-7-3, <br />and 7-6-7-5. <br />TABLE 7-6-7-2 <br />CN FACTOR <br />Vegetation Hydrologic Vegetation <br />Cover Type Soil Group Cover (~) CN <br />Pasture B 30-70 69 <br />Gravel Roads N/A N/A 91 <br />Bare Ground D N/A 94 <br /> <br />7-6-7-4 Revised 08/20/93 <br />F' ~ <br />