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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 />IV. SUMMARY OF HYDROLOGY <br /> <br />General <br />Hydrologic analysis was conducted as part of the "Beebe Draw and Barr Lake Tributary <br />Areas-Outfall Systems Planning Study" dated May, 1992 (Outfall Plan). The study was prepared <br />by Wright Water Engineers, Inc. The Outfall Plan hydrologic analysis included the <br />determination of the 10-, 50- and 100-year peak flows for three different watershed development <br />conditions, namely, existing conditions, future watershed development conditions with existing <br />drainageways and future watershed development conditions with proposed drainage masterp1an <br />facilities. <br />The Colorado Urban Hydrograph Procedure, version E (CUHPE) was used to develop <br />runoff hydrographs from individual subcatchments and the Urban Drainage Storm Water <br />Management Model (UDSWM2) used to route the hydrographs through the drainage system. <br />The input data for the CUHP model include rainfall depth, imperviousness, basin area <br />and slope, basin tributary width, roughness coefficient, soil infiltration rate, surface retention <br />depth, etc. The UDSWM2 model input includes channeVpipe length and slope, channel/pipe <br />configuration and roughness coefficient, detention pond storage and outflow capacity. etc. Input <br />parameters for the hydrology models are given in the "Beebe Draw and Barr Lake Tributary <br />Areas, Outfall Systems Planning Study, Preliminary Design Report", dated May, 1992 (Outfall <br />Plan). Hydrologic information is available for review at the UDFCD. <br />Peak discharges for the 10-, 50-, and 100-year floods are given in the floodplain and <br />floodway reference tables given in chapter VI and are shown graphically in figures 2 through 5. <br /> <br />5 <br />