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<br />RECOMMENDED UNIFORM INFILTRATION RATES <br /> <br />S.OIL TEXTURE CLASS <br /> <br />INFILTRATION RATE (in/h,) <br />---J <br /> <br />Silty Clay Loam <br />Sand~ Clay <br /> <br />0.05.0.10 <br /> <br />-.-----------! <br /> <br />0.03 - 0.05 <br /> <br />Silty Clay <br /> <br />____.0.02 . O~___-! <br /> <br />Clav 0.01 . 0.02 <br />(Rawls. et aI., 1983 ancrniudment, Rawl,;, et al.."'T99.1) <br /> <br />These values are based on tre saturated hydraulic conductivity for soils in each <br />texture class. In addition to the values listed in the table above, the SCS has developed <br />a soil classification system that consists of fOllr groups of soils. Group A includes deep <br />sand, deep loess, and aggregated siits. Group B consists of shallow loess and sandy <br />loams. Group C includes clay loams, sl1allow sandy loam, and soils low in organic <br />content and high in clay. Group D consists of soils that swell significantly when wet such <br />as heavy plastic clays and certain saline sOils. R9commended infiltratior, rates for each <br />soil group are as follows: <br /> <br />Table 7.4 <br /> <br />I GROUP [ SOIL TYP <br /> A Sand, Aggregated Silt <br /> B Shallow Loess, Sandy <br /> C Low Organics, High CI <br /> D Plastic Clays, Saline <br /> <br />E <br /> <br />G~~~o~~~;~-I <br /> <br />0.30 . 045 <br /> <br />Loarns <br /> <br />O.lS - 0.30 <br /> <br />ay <br /> <br />0.05.0.15 <br /> <br />0.00 . 0.05 <br />(1\;rccu:en.l'ml0-'----==='=- <br /> <br />Table 7.5 lists Colorado soils and their re"pective hydrologic clas,;itlcations. <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />DRAFT <br /> <br />7.17 <br />