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<br />. <br /> <br />3. <br /> <br />Channel slopes for Big Dry Creek were obtained from the <br /> <br /> <br />1973 UD&FCD Big Dry Creek Report (Reference 6). <br /> <br />. <br /> <br />4. <br /> <br />Nanning's "n" values were computed us ing guidelines <br />established by the Soil Conservation Service (Reference <br />13) . <br /> <br />. <br /> <br />. <br /> <br />2.1 General Analysis <br /> <br />. <br /> <br />Since no stream gage data is available for the study <br />streams, a rainfall~runoff analys is was conducted on <br />the watersheds to determine the flood discharges. This <br />was accomplished by using the Urban Drainage and Flood <br />Control District (UD&FCD) CUHPD rainfall-runoff compu- <br />ter program to develop the storm hydrographs (Reference <br />5) and the U. S. Army Corps of Engineers HEC-1 flood <br />hydrograph package computer program for the stream and <br />reservoir routings (Reference 12). For this analysis, <br />basin characteristics which define the size, shape, and <br />runoff characteristics of the watershed as well as <br />rainfall amounts based on the selected recurrence <br />intervals are used to compute flood hydrographs for <br />various design points in the basin. All stream and re- <br />servoir routings were accomplished using the Modified <br />PuIs method. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />