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3. SEDCAD+ INPUT PARAMETERS COMMON TO ONE <br />OR MORE AREAS <br />3.1 _ Rainfall -Depth - <br />The rainfall depth for a 10 -year, 24 -hour storm event was determined to be 1.90 inches; the rainfall depth for a 100 - <br />year, 24 -hour storm event was determined to be 2.8 inches [National Oceanic and Atmospheric Administration <br />(NOAA) Atlas 2, Precipitation - Frequency Atlas of the Western United States, Volume III - Colorado, & Previous <br />Reports]. <br />3.2 Land Use Condition (LUC) <br />LUC values are consistently applied as follows (reference SEDCAD+ guide): <br />For undisturbed portions of the watershed, overland flow: 2 (woodland). <br />For fill slopes, overland flow: 5 (nearly bare). <br />For other than overland flow and for ditch flow: 7. <br />4. UNIQUE SEDCAD+ INPUT PARAMETERS <br />SEDCAD+ parameters unique to a situation are introduced as encountered under area specific discussions. <br />• 4.1 Areas <br />Areas (acres) were. measured (map) as follows: <br />'r -;.1., A 7 V—r of Wntorchodc <br />Location <br />SEDCAD+ Identifier I <br />Acres <br />(77re upland watershed, above <br />Ditch D -1, is included in a sepa- <br />(Subwatershed I of a separate <br />SAE demonstration.) <br />(Included in a separate SAE <br />demonstration.) <br />rate SAE demonstration.) <br />the southwest quadrant of the top <br />1 -1 -1 -1 <br />0.07 <br />of the development waste pile <br />the area between the southwest <br />1 -1 -1 -2 <br />0.2 <br />quadrant of the development waste <br />pile and the interceptor ditch D -1 <br />the sideslopes of the southwest <br />1 -1 -1 -3 <br />0.03 <br />quadrant of the development waste <br />pile <br />the southeast quadrant of the top <br />1 -2 -1 -1 <br />0.07 <br />of the development waste pile <br />. (West Elk Lone Pine Gulch Development Waste Pile SAE, 12 October 1995, Page 4 of 7) <br />