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<br />--. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />BASI N AND SUB-BASI N PARAMETERS <br /> <br />The total drainage basin influencing the study reach is divided into Gunnison <br />River proper designated "G" and Tomichi Creek designated "T". Each of these two major <br />basins, forming a portion of the total Gunnison River basin, was divided into smaller sub- <br />basins. These sub-basins were selected to have their outlet points coincide with the loca- <br />tion of streamflow gaging stations located throughout the Gunnison River basin. Further, <br />such a division is to facilitate that each sub-basin would behave in a reasonably uniform <br />manner during a storm, and to enable the routing and lagging computations to be per- <br />formed within a more credible accuracy level. <br /> <br /> <br />The drainage area above the study reach was divided into a total of 15 sub- <br />basins. These sub-basi ns are shown on Plate 1, and are designated G-l through G-l0 <br />for the Gunnison River, and T-l through T-5 for the Tomichi Creek. The size, length, <br />slope, aspect, elevation (lower/upper), hydrologic soi I group and vegetative cover type <br />are shown for each sub-basin and are presented in Tobie 1. Also, a partial list of the same <br />parameters were derived for the entire area above outlet points to individual sub-basins. <br />These parameters are presented in Table 2, and an explanation of how they were developed <br />is included in the Appendix. <br /> <br /> <br />Basin parameters were estimated on existing land use conditions. These values <br /> <br />were based on the aerial photographs, contour maps, field inspections and various pre- <br /> <br />viously prepared basic data reports obtained from different sources recognized in their <br /> <br />fields of specialty. Due to the large size of the drainage area affecting the study reach, <br /> <br />coupled with both the historical and projected future low level of land development in the <br /> <br />basin, it is anticipated that the future development within the basin will not appreciably <br /> <br />affect the peak flows. <br /> <br />I <br /> <br />-1- <br />