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<br /> <br />r,;, <br />\:;~.':~ <br /> <br />(',':- <br />\~;" <br /> <br />, -TABLE I- <br />I-HOUR RAINFALL DISTRIBUTION <br /> <br />End of Period <br />(minutes) <br /> <br />Incremental Rainfall <br />(percent) <br /> <br />t€2~l: <br />II <br />,-~,l:,<,~\:{ <br /> <br />5 <br />10 <br />15 <br />20 <br />25 <br />30 <br />35 <br />40 <br />45 <br />50 <br />55 <br />60 <br /> <br />3 <br />4 <br />4 <br />5 <br />12 <br />16 <br />29 <br />12 <br />5 <br />4 <br />4 <br />2 <br /> <br />'-"',"'~~\' <br /> <br />~~fil~~ <br /> <br />c. Losses. Infiltration rates for the Sheep Draw basin were obtained <br /> <br />,'''-'-.' '"~. <br />.'.:':'~:,:~~.!: <br /> <br />~{~~ <br /> <br />:.~......, '-~... <br />~~S1s <br />.~,;-~;..~ <br />~~ <br />';"",,..' <br />,- .. <br />~~ <br />~ <br /> <br />from Soil Resources of Colorado, Region 2 - Larimer and Weld Counties, <br /> <br />published by the Colorado State University Experiment Station, Fort Collins, <br /> <br />and the Soil Conservation Service, USDA, in 1976. A general soil map of Weld <br /> <br />County used in conjunction with Table 3 of the CSU publication lists ranges of <br /> <br />infiltration permeabilities for each soil series. Table 2 below contains the <br /> <br />-'", <br /> <br />soil associations that were taken from the general soil map, the range of in- <br /> <br />. <br />' - <br />'-,"'.-,~~' ' <br /> <br />filtration permeabilities at various depths for each soil series, and the in- <br /> <br />filtration rate that was used in the SWMM model. <br /> <br />"~;':':-(i!, <br /> <br />TABLE 2 <br />INFILTRATION RATES FOR SHEEP DRAW BASIN <br /> <br />>;.::t,:'!: <br /> <br />Soil Association Soil Series Depth Permeability SWMM Infiltration <br />Rate <br /> (Inches) (Inches/Hour) (Inches/Hour) <br />Olney-Kim-Otero Olney 0-10 0.6 - 2.0 0.8 <br /> 10-20 0.6 - 2.0 <br /> 20-30 0.6 - 6.0 <br /> 30-60 2.0 6.0 <br /> <br />< ,,'j <br /> <br />,f~1~ <br /> <br />-;:-r~::..:; <br /> <br /> Kim 0-60 0.6 - 2.0 <br /> Otero 0-60 6.0 - 2.0 <br />Weld - Colby Weld 0-7 0.6 - 2.0 0.8 <br /> 7-30 0.2 - 0.6 <br />:>~~.,-~ 30-60 0.6 - 2.0 <br />~ Colby 0-60 0.6 - 2.0 <br />~ <br /> 3 <br />