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<br />. . <br /> <br />present development. Where future development within the basin may <br /> <br />be significant, the effect of this development on the peak flows may <br /> <br />have to be analysed. <br /> <br />The factors to be evaluated in the hydrologic analysis are as <br /> <br />follows: <br /> <br />1. Basin Parameters <br /> <br />All significant drainage basin characteristics that affect <br /> <br />the rainfall-runoff relationship shall be evaluated. Basin <br /> <br />parameters such as size, length, slope, aspect and elevation <br /> <br />shall be measured and tabulated for each basin and sub-basin. <br /> <br />Soil and vegetativ~ cover types shall be evaluated and basin <br /> <br />infiltration rates determined. <br /> <br />2. Pr~_cipitation Data <br />An analysis of available precipitation data shall be made. <br /> <br />Actual precipitation records from local stations or major <br /> <br />recor~n~ r~orm events shall be compared to precipitation <br /> <br />data as published in NO^^ Atlas 2, Precipitation Frequency <br /> <br />Atlas of the Western United States, Volume III Colorado. <br /> <br />The design storm shall be based on either the recorded <br /> <br />precipitation events or the statistical data. <br /> <br />3. Streamflow Records <br /> <br />All available streamflow data from within the basin and <br /> <br />adjacent basins shall be investigated. <br /> <br />^ statistical analysis of the individual streamflow record <br /> <br />as well as a regional anQl1sis of the data shall be made. <br /> <br />Hydrographs of major flood events shall be examined from <br /> <br />streamflow and precipitation records for hydrology. <br /> <br />-4- <br />