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<br />1 <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 />HYDROLOGY <br /> <br />II-5 <br /> <br />large flood peaks. Most major floods on the South Platte River have been <br />associated with thunderstorm activity. Recurrent major storm tracks have <br />been identified which cross the South Platte River watershed and generate <br />most flood flows. <br /> <br />Peak flows from South Platte tributaries directly affecting the Union <br />Avenue location are shown in Table II-3. The flood peak flows presented in <br />Table II-4 are based on future development conditions and existing channel <br />and floodplain conditions. The discharge profile developed for the South <br />Platte below Chatfield Reservoir is shown on Figure II-2. A hydrograph <br />near Sanderson Gulch is shown in Figure Il-3. <br /> <br />TABLE Il-3 <br />TRIBUTARY BASIN PEAK INFLOW <br /> <br />Tributary <br />Dutch Creek <br />Big Dry Creek <br /> <br />Peak 100-year Inflow <br />(cfs) <br /> <br />7,400 <br />12,600 <br /> <br />TABLE II-4 <br />SOUTH PLATTE RIVER <br />PEAK FLOOD FLOWS <br /> <br /> <br /> Discharge (cfs) <br />Location Recurrence Interval <br /> 2-Year 10-Year 50-Year 100-Year <br />D/S Dutch Creek * " 5,060 6,400 <br />S. Platte @ Littleton " 3,100 6,170 7,940 <br />D/S Big Dry Creek " 4,350 9,600 12,600 <br />D/S Little Dry Creek " 5,750 12,200 16,000 <br />D/S Cherry Creek 3,580 9,700 18,000 22,500 <br />S. Platte at 19th Ave. 3,580 9,700 18,000 22,400 <br />" Snowmelt and dam releases predominate <br />