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<br />-5- <br /> <br />'. <br /> <br />------ <br /> <br />The design storm precipitation defined under Phase III will <br /> <br />"- - <br /> <br />then be applied to the basin and, thusly, the design hydro- <br />graphs for the channel routing. The unit hydrographs will <br />7 <br />be defined utilizing the modified S.C.S. system. . <br />The unit hydrographs will be checked against available <br /> <br />short term runoff data during and immediately subsequent to <br />well defined storms using the U,S.G,S. flow recorder "c!iill and <br />available precipitation records. Since the st~eam flow <br /> <br />gages for the Main Gore station and the Black Gore station <br />were installed on October of 1947; nearly 27 years of record <br /> <br />should be available, however, during the period of September, <br /> <br />1956, to October, 1963, the gages were not operated. The <br />gages on Bighorn, Pitkin, Booth, Middle Creek and Red Sand- <br /> <br />stone Creek, were all installed in October of 1963. ~Ihile <br /> <br />these records will be useful in correlation of the synthesized <br />hydrographs with actual runoff occurrences, the short period <br />of record relative to the 50 and 100 year recurrence interval <br /> <br />storms required for the flood plain analysis will reduce the <br /> <br />usefulness of these records. <br /> <br />V. CHANNEL MODEL AND ROUTING <br /> <br />The model for the Gore Creek will be developed from the <br /> <br />confluence of Black and Main Gore Creek westward to just <br /> <br />above the confluence of Gore Creek with the Eagle River. <br /> <br />This reach is approximately 11 miles in length. The profile <br />