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<br />II <br />I <br />I <br />:1 <br />I <br /> <br />:1 <br />I <br />II <br /> <br />, <br /> <br />II <br /> <br />I <br />II <br />\1 <br />!I <br /> <br />, <br /> <br />;1 <br />'I <br />I <br />II <br />i <br />I <br />I <br />I <br />I <br />II <br />'I <br /> <br />I <br /> <br />The rainfall depths were then divided into five-minute incremental <br /> <br />values for the one-hour cloudburst event. These increments were <br /> <br />arranged into a likely storm distribution that was determined <br /> <br />from an analysis of data in the Denver area (Reference II). <br /> <br />Preliminary rainfall loss rates of depression storage and <br /> <br />infiltration were taken from existing information. The <br /> <br />U. S. Army Corps of Engineers provided a depression storage <br /> <br />rate of 0.3" from their experience in studies along the front <br /> <br />range. <br /> <br />Infiltration rates were assumed to equal permeability <br /> <br />values from the Soil Survey for the Larimer County Survey Area <br /> <br />#644 dated September 2, 1971 (Reference 12). <br /> <br />Basin slopes and channel slopes were taken from the U. S. <br /> <br />Geological Survey's quadrangle maps. Channel and overbank <br /> <br />cross-sections and roughness coefficients were estimated <br /> <br />from field inspection. <br /> <br />The selected basin conditions for this hydrologic analysis <br /> <br />were described in the Scope of Work for this contract as follows: <br /> <br />Reach T <br /> <br />Confluence with Cache ia Poudre River <br /> <br />upstream to the north section line of <br /> <br />Sections 29, 28, 27 and 26, Range 69 West, <br /> <br />Township 8 North. Use fully developed <br /> <br />basin conditions. <br /> <br />.. . <br />~~~~ <br />