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<br />• <br />• <br />3. SEDCAD+ INPUT PARAMETERS COMMON TO ONE <br />OR MORE AREAS <br />3.1 Rainfall Depth <br />The rainfall depth fora 10-year, 24-hour storm event waz determined to be 1.90 inches; the rainfall depth fora 100- <br />yeaz, 24-hour storm even[ was determined to be 2.8 inches [National Oceanic and Atmospheric Administration <br />(NOAA) Atlas 2, Precipitation -Frequency Atlaz of the Western United States, Volume III -Colorado, & Previous <br />Reports]. <br />3.2 Land Use Condition (LUC) <br />LUC values are consistently applied az 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 az encountered under area specific discussions. <br />4.1 Areas <br />Areaz (acres) were measured (map) az follows: <br />Table 4.1 Sizes of Watersheds <br />Location SEDCAD+ Identifier Acres <br />(l7te upland watershed, above (Subwatershed 1 of a separate (Included in a separate SAE <br />Ditch D-1, is included in a sepa- SAE demonstration.) demonstration.) <br />rate SAE demonstration.) <br />the southwest quadrant ojthe top 1-1-1-1 0.07 <br />of the development waste pile <br />the area between the southwest t-1-I-2 0.2 <br />quadrant of the development waste <br />pile and the interceptor ditch D-! <br />the sideslopes of the southwest 1-l-1-3 0.03 <br />quadrant of the developmem waste <br />pile <br />the southeast quadrant of We rop 1-2-1-1 0.07 <br />of the development waste pile <br />(West Elk Lone Pine Gulth Development Wasce Pile SAE, 12 Octobm 1995, Page 4 of 7) <br />