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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />basin, Further, such a division is to facilitate that each sub-basin <br /> <br /> <br />would behave in a reasonably uniform manner during a storm, and to <br /> <br /> <br />enable the routing and lagging computations to be performed within a <br /> <br /> <br />more credible accuracy level. <br /> <br /> <br />The drainage area above the study reach was divided into a <br /> <br /> <br />total of 15 sub-basins. These sub-basins shown on Plate 1, are desig- <br /> <br /> <br />nated G-l through G-10 for the Gunnison River proper and T-l through T-5 <br /> <br /> <br />for the Tomichi Creek proper. The size, length, slope, aspect, eleva- <br /> <br /> <br />tion (lower/upper), hydrologic soil group and vegetative cover type for <br /> <br />each sub-basin are presented in Table 1. Also, a partial list of the <br /> <br /> <br />same parameters were derived for the entire area above outlet points to <br /> <br /> <br />individual sub-basins. These parameters are presented in Table 2, and <br /> <br /> <br />an explanation of how they were developed is included in the Technical <br /> <br /> <br />Addendum. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />~ <br /> <br />Basin parameters were estimated using existing land use con- <br /> <br />ditions. These values were based on information obtained from aerial <br /> <br /> <br />photographs, contour maps, field inspections and other basic data re- <br /> <br /> <br />ports obtained from the local governments. Due to the large size of the <br /> <br /> <br />drainage area affecting the study reach, coupled with both the his- <br /> <br />torical and projected future low level of land development in the basin, <br /> <br /> <br />it is anticipated that the future development within the basin will not <br /> <br /> <br />appreciably affect the peak flows. <br /> <br />9 <br />