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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 />3 <br /> <br /> TABLE 2 <br /> FLOOD CONTROL RESERVOIRS <br /> Storage (Acre-feet) <br /> Permanent* Closure <br />Reservoir Total Pool Flood Control Surcharge Date <br />Chatfield 235,000 26,661 208,370 119,900 08/1973 <br />Cherry Cr. 93,920 13,960 79,960 134,470 10/1948 <br />Bear Creek 30,810 1,990 26,570 46,410 07/1977 <br /> <br />*Permanent pool storage includes recreationaljmultipurpose pools and sedi- <br />ment control volumes. <br /> <br />Peak Flows <br />A majority of the precipitation which falls over the South platte River <br />basin consists of snowfall in the mountainous region and thunderstorm <br />activity in the high plains and foothills portions of the basin. Snowfall <br />in the mountains and higher foothills results in runoff peaks in the late <br />spring, however, these peaks are reduced by Chatfield Dam. Snowmelt in the <br />lower foothills and high plains is not normally associated with sharp or <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 in the study reach are shown in <br />Table 3. These tributaries are shown on Figure 1. The flood peak flows <br />presented in Table 4 are based on future development conditions and exist- <br />