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TABLE 7 -6 -7 -1 <br />4P 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 />Z <br />Vegetation <br />Hydrologic <br />Vegetation <br />Cover Type <br />Soil Group <br />Cover ( %) CN <br />Pasture <br />B <br />30 -70 69 <br />Gravel Roads <br />N/A <br />N/A 91 <br />Bare Ground <br />D <br />N/A 94 <br />NOR 006606 <br />7 -6 -7 -4 <br />Revised 08/20/93 <br />Z <br />