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f1 <br />u <br />Pond <br />TABLE 6 <br />LORENCITO CANYON MINE <br />LUC VALUES <br />Land Use Overland Flow Condition Channel Flow Condition <br />Undisturbed portions of grassland 3 7/$ <br />Undisturbed portions of oak- 1 7/g <br />pinyon, mountain shrub or <br />onderosa ine <br />Cut and fill slopes compacted pads 5 7/$ <br />and roads bare soil <br />Reclaimed Areas 4 ~/$ <br />Ditches (does not occur) g <br />SEDCAD+ also requires input on the speed of flow through a drainage. The Hydrograph Response <br />shape reflects the rapidity with which water runs off a watershed, as fast, medium, or slow. A slow <br />response shape would correspond to a forested azea or an area with a lot of obstructions, while a fast <br />response shape would correspond to an unvegetated or poorly protected azea. These ratings are for <br />overland flow. Once overland flow is surpassed, a fast rating is assigned. <br />• Additional sedimentology input parameters which are required include specific gravity, submerged <br />bulk specific gravity and an eroded particle size textural distribution. The specific gravity is <br />designated as 2.65, a value typically associated with silt-sized particles. Textural distributions are <br />identified in Table 7. The submerged bulk specific gravity is set at 1.35 for runs where there are <br />predominantly soils from Shawa, Trag, Louvier-Rombo/Travesilla, or Saruche-Rombo. Runs where <br />the soils are predominantly Fughes or Louviers-Sarcillo-Trag were tun at a submerged bulk density <br />value of 1.12, <br /> <br />Sedimentology assumptions include values for the soil erodibility constant (K), length (L), slope (S), <br />and cover practice (CP). The soil erodibility constant is a function of soil texture, structure, <br />permeability and organic matter. Soil specific K values were employed in the analysis, and maybe <br />reviewed in Table 9. <br />(revised 4/20/01) <br />