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<br />I <br />I <br />I <br />I <br /> <br />5 <br /> <br />. <br /> <br />Flood Flows and Design,Hydrographs <br /> <br /> <br />The flood flows at various locations were determined by the SWMM com- <br /> <br /> <br />puter program. SWMM represents a basin by an aggregate of subareas, <br /> <br /> <br />drained by pipe/gutter systems and routes the flood flows through the <br /> <br />basin using supplied data. Table III presents flood discharges and <br /> <br /> <br />their corresponding frequencies at five locations for future develop- <br /> <br /> <br />ment conditions. Typical 100-year hydro graphs are shown in Figure 1, at <br /> <br />Lakes Lake, Marston Sump, the Marston Water Treatment Plant and at the Bear <br /> <br />Creek Confluence. Figure 2 shows the design flow profile for the 2-, 5-, <br /> <br /> <br />10- and 100-year flood frequencies for the fully developed basin con- <br /> <br /> <br />dition and the 100-year peak flow profile for the existing basin devel- <br /> <br />opment. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />TABLE III <br />Flood Frequency and Discharge <br /> <br />I <br />I <br /> <br /> 2-year 5-year 10-year 50-year 100-year <br />Location (ds) (ds) (ds) (cfs) (ds) <br />Lakes Lake 170 320 440 660 740 <br />Marston Sump 210 420 680 980 1,040 <br />Marston Water Treatment Plant 230 440 760 1,030 1,140 <br />Bear Creek Confluence 270 540 860 1,260 1,410 <br /> <br />. <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br />. <br />