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<br />. <br /> <br />.) <br /> <br />. <br /> <br />DRAFT SOUTH PLAITE RIVER TRIBUTARIES HYDROLOGY REPORT <br /> <br />FOUR MILE CREEK, HORSE CREEK, WEST CREEK, AND TROUT CREEK <br /> <br />1.0 Introduction <br /> <br />This report describes the hydrologic analysis completed for the following four tributaries <br />to the South Platte River: Four Mile Creek, Horse Creek, West Creek, and Trout Creek. <br />All of these tributaries are located witll1in Douglas County, Colorado. The Vicinity Map, <br />Figure 1, illustrates the approximate study area location. <br /> <br />The hydrologic conditions of these tributary watersheds were affected by the June 2002 <br />Hayman fire. The Hayman fire burned approximately 216 square miles (USGS, 2004) <br />and the location and severity of the bum within the tributary watersheds varied depending <br />upon the specific location. <br /> <br />The United States Geologic Survey (USGS) in cooperation with the Federal Emergency <br />, Management Agency (FEMA) complded an evaluation of the affects of the fire on the <br />hydrologic conditions within the South Platte River Tributaries. The results of this <br />analysis are documented in the April 2004 USGS draft report "Analysis of Post-Fire <br />Hydrologic Hazards for the 2002 Hayman. Coal Seam. and Missionary Ridge Wildfires. <br />Colorado". <br /> <br />A number of the sub-basin hydrologic parameters, developed as part of the USGS efforts, <br />have been included in this analysis to determine peak flows for the tributaries. <br /> <br />1.1 Purpose of Study <br /> <br />The purpose of this hydrology report is to document the procedures used to develop the <br />peak flow discharges for four of the South Platte River Tributaries. Flood discharges <br />were developed for the 10-,25-,50-, 100-, and 500-year stonn events. In addition, the <br />results of the hydrologic modeling are presented with peak flows being identified at <br />various design points and drainageway confluences within the study area. <br /> <br />These peak flows will be used in the :next phase of the study - completion of floodplain <br />hydraulic modeling. This hydraulic modeling will identify the floodplain characteristics <br />and boundaries needed to establish a FEMA regulatory floodplain for Four Mile Creek, <br />Horse Creek, West Creek, and Trout Creek. <br /> <br /> <br />Page 2 <br />