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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Flood Hazard <br />Page four <br /> <br />Hvdroloqv <br /> <br />Paint Pony Gulch is a small tributary to Loy Gulch. which <br />is in turn a tributary to Trout Creek. Trout Creek joins Horse <br />Creek which is tributary to the South Platte River at Deckers. <br />Several subbasins of Paint Pony Gulch come together just <br />upstream of Kelley Road. The total drainage area of Paint Pony <br />Gulch just upstream of Kelley Road is approximately 255 acres <br />as shown in Figure 3. This basin includes portions of the town <br />and Teller County. <br /> <br />The Master Drainage Plan prepared by Gilbert. Myers & Sams. <br />Inc.. in December. 1979. calculated the 100-year peak flow on <br />Paint Pony Gulch downstream of Kelley Road as 113 cubic feet <br />per second (cfs). <br /> <br />Peak runoff values for the basin above Kelley Road were <br />calculated in 1984 by Rocky Mountain Geotechnical. Inc. for the <br />developer of the Mountain View SUbdivision. They divided the <br />basin into six subbasins and used the U.S. Soil Conservation <br />Service (SCS) method of triangular unit hydrographs to <br />calculate the 5-year and 100-year peak flows. The cumulative <br />peak discharges were developed assuming all subbasin peak <br />discharges can be added together at the same time. The <br />following table is a summary of their results: <br /> <br />Storm <br />Duration, hrs. <br /> <br />Rainfall. <br />inches <br /> <br />Cumulative Peak <br />Discharqe. cfs <br /> <br />Return Period <br /> <br />5-year <br /> <br />24 <br /> <br />2.2 <br /> <br />17.2 <br /> <br />100-year <br /> <br />24 <br /> <br />3.8 <br /> <br />150.1 <br /> <br />On December 11, 1986. the Federal Emergency Management <br />Agency (FEMA) held Final Coordination Meetings to present the <br />preliminary Flood Insurance Studies it was conducting for both <br />Teller County and Woodland Park. A representative of the <br />Colorado Water Conservation Board staff attended both <br />meetings. The new Flood Insurance Study for Teller County <br />established the peak flows on Paint Pony Gulch downstream of <br />Kelley Road as shown in the following table: <br />