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<br /> <br />. <br /> <br />TABLE 1 <br />RAINFALL DISTRIBUTION <br /> <br />End of Period <br />(Minutes) <br /> <br />Percent of 6-Hour <br /> <br />30 <br />60 <br />90 <br />120 <br />150 <br />180 <br />210 <br />240 <br />270 <br />300 <br />330 <br />360 <br /> <br />2 <br />4 <br />4 <br />5 <br />9 <br />10 <br />40 <br />10 <br />6 <br />4 <br />4 <br />2 <br /> <br />c. Losses (Mountains). The loss parameters for the mountain portion of <br /> <br />the Clear Creek basin modeled with MITCAT was based on a trial and error <br /> <br />selection of SCS curve numbers. The final selection of 60 for forested areas <br /> <br />and 66 above timberline were the curve numbers required in the model to obtain <br /> <br />representative discharges at Golden. <br /> <br />d. Losses (High Plains). An infiltration rate of 0.5 inch/hour was used <br /> <br />for the pervious. areas in the high plains portion of the basin below Golden. <br /> <br />This rate was increased to 1.00 inch per hour for the forested foothills <br /> <br />region modeled with SWMM. Adjustments were made to the detention. storage <br /> <br />parameter during initial trial and error runs with a final selection of 0.5 <br /> <br />inch for the plains area and .05 inch for the forested foothills areas. It <br /> <br />is believed that storage provided in the numerous gravel pits located along <br /> <br />the Clear Creek flood plain in the lower portion o.f the basin may be the reason <br /> <br />that upward adjustment of the detention storage was required. <br /> <br />e. Calibration. <br /> <br />(1) General. Calibration of both models was keyed to the discharge <br /> <br />6 <br /> <br />