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streamflow, and irrigation may cause the water table to <br /> rise up to 5 feet during the late spring and early summer <br /> months. <br /> Water Quality. Sampling of South Boulder Creek has shown <br /> that present water quality is well within the standards of <br /> the classification assigned by the Colorado Water Quality <br /> Control Commission. During periods of heavy precipitation <br /> and snow melt, the creek will be high in the quantity of <br /> suspended solids and turbidity. During dry periods, most <br /> of the stream recharge will be from ground water which is <br /> naturally filtered and the turbidity and concentrations of <br /> suspended solids will be negligible. <br /> i <br /> Drainage and Flood Control . A substantial portion of the <br /> site is located within the 100-year floodplain of South Boulder <br /> Creek as defined by the Urban Drainage and Floodplain Control <br /> District. The 100-year floodplain is shown in Figure C-1. <br /> The South Boulder Creek channel capacity of 1700 cfs. <br /> approximates a 5-year recurrence interval. Flows exceeding <br /> this amount cause local flooding of South Boulder Creek. <br /> Flooding in this general area occurs from two sources : (1) <br /> overflow from South Boulder Creek, and (2) overland flow <br /> entering the site from the southwest as a result of inadequate <br /> channel and bridge capacity south of Marshall Road and State <br /> Highway 93. These result in shallow overland flooding. A <br /> A-6 <br />