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,~~. ~ M <br />February 27, 1997 -2- 963-2178 <br />hour. Rainfall depth for the 10-year, 24-hour storm event in the vicinity of the proposed <br />work was determined to be 1.90 inches [National Oceanic and Atmospheric Administration <br />(NOAA) Atlas 2, Precipitation -Frequency Atlas of the Western United States, Volume III - <br />Colorado, & Previous Reports]. <br />SedCAD+ soil input parameters unique to each site include Land Use Condition (I,UC), <br />Curve Number (CN), Hydrograph Response Shape (HRS), Length of Overland Flow, <br />Control Practice Factor (CP), and acreage. Values for LUC, CN, HRS, Flow Length and <br />CP used in the analyses are presented in the following tables (reference SedCAD+ guide). <br />Acreages were calculated from base mapping and are included in the SedCAD+ input/output <br />documentation. <br />TABLE 1 <br />LUC VALUES <br />TABLE 2 <br />CN VALUES <br /> <br />;::•:;:::;.:::s::::1`YPe:oE Area::' ..:::::::::::::::.... <br />:.:.:.:::..:. <br />seacan+: clt-tGaon :.::.::::::: :..::::::.:.:. <br />C .:.:slue'-:::::'';: <br />Undisturbed portions of the watershed, Oak 30% Oak-Aspen Cover Density 68 <br />Cover <br />Undisturbed Portiotu of the Watershed, Pine 40~7o Pine Cover Deosiry 71 <br />Cover <br />Fill slopes, baze (worst case), and vegetated Developing Urban Area (No 91 <br />azeas subject to distttrbance by traffic Vegeta[ion) <br />Cut slopes, Soil Guard An estimated value, between a 88 <br /> classification of a Fully Developed <br /> Urban Impervious Area of Dirt and <br /> Gravel Street and Roads <br />Gravel hazdsrands and roads Fully Developed Urban Areas, 89 <br /> Impervious Areas, Sweets and Roads, <br /> Gravel, Hydrologic Soil Group C <br />TbP\46\?I1L\?I]PFM? IlR Golder llssociafPs <br />