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SEDCAD NOTE <br />• EAST PORTAL AREA RECLAMATION DRAINAGE AREAS <br />#1B & 2B <br />sws #1B <br />Soils Moyerson stony clay loam/rock outcrop - Hydrologic <br />soils group D. <br />CN = 85 Sagebrush with grass understory in poor condition <br />(very conservative). <br />Soil K = 0.24 Taken from NRSC Soil Survey of Rio Blanco County <br />L = 140 Length before runoff becomes channeled flow. Numerous <br />drainage features within SWS. <br />S = 50% <br />C = 0.007 From RUSLE 1.06 <br /> Precipitation data from Rangely, CO <br /> Clay loam, 50% slope, 5. Range, Length of segment <br /> 140', 40a rock cover, adjusted for ponding, 20 years <br /> to consolidation, time invariant, information from <br /> plant community and site potential, plant community - <br /> 7. Cold desert shrub, annual site production potential <br /> 650 lbs./ac. (NAGS), canopy cover 20%, fall height 0.5 <br /> feet, roughness 1.1 (sagebrush), no mechanical <br /> disturbance, 20% veg. residue cover. <br />• P = 1.0 <br />SWS #2B <br />Soils Forelle loam and Rentsac loam- Hydrologic soils groups <br /> B & C respectively (topsoil source). HSG `B' used <br /> since Rentsac `C' grouping is due to restrictive <br /> layers. This impeding layer would not be present on <br /> non-compacted fill, thus justifying the `B' grouping. <br />CN = 86 Cultivated Ag land, fallow, bare soil (extremely <br /> conservative - no credit allowed for contouring with <br /> fallow). <br />Soil K = 0.28 0.28 for Forelle and 0.24 for Rentsac - Table II- <br /> I-2. (0.28 used) <br />L = 165 Length before runoff becomes channeled flow. <br />S = 20% <br />C = 0.54 From SedCad - Typical C factors reported in literature <br />- seed and fertilize, fresh unprepared seedbed - after <br />6 months. (No mulch) <br />P = 0.15 RUSLE 1.06 Frequent disturbance, very high ridges, <br />1.1% furrow grade, soils HSG (2), C3) heavy cover <br />• and/or very rough. (Obtained by ripping by dozer on <br />contour.) <br />