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<br />Gulch, the precipitation values were obtained from the <br />Precipitation Frequency Atlas of the United States (Reference <br />3). The unit hydrographs used in the computations were <br />computed using the General Mountain S curve. Loss rates used <br />in the HEC-l model were computed using Soil Conservsation <br />Service Curve numbers. The results are listed in the Appendix <br />of this report. <br /> <br />Tributaries 1 and 2 <br /> <br />Tributaries 1 and 2 were studied by approximate methods using <br />the Rational Method. The calculations are shc)1m in the <br />Appendix of this report. <br /> <br />RESULTS <br /> <br />Based on the hydrologic analyses outlined in this report, peak <br />discharges for floods of the 10.-, 50.-, 10.0.-, and 5aa-year <br />recurrence intervals were computed. The results are 1 isted in <br />Table 2. <br /> <br />TABLE 2 <br />FLOOD DISCHARGES - CRAIG AND MOFFAT COUNTY <br />FLOOD I N SDRj\NCE--S~fmJ1 ES-- -,......_-,- <br /> <br />!,looding Source <br /> <br />Yampa River <br />/ <br />t(J~/ <br /> <br />Brotherton Gulch <br />/, <br />\.,CJv <br /> <br />Pine Ridge Gulch** <br /> <br />(,..0- <br /> <br />Cedar Mountain <br />Gulch** <br /> <br />Description ot~::.':lc:.h <br /> <br />Downstream Study Limit <br />Downstream of Anabranch <br />Confluence <br />Upstream of Anabranch <br />Confluence <br />Upstream Study Limit <br /> <br />Mouth <br />5280. Feet Upstream of <br />Mouth <br />Upstream Study Limit <br /> <br />Mouth <br />Highway 13-789 <br />Upstream of Cedar <br />Mountain Gulch <br />Confluence <br />Upstream Study Limit <br /> <br />Houth <br />Upstream Study Limit <br /> <br />-3- <br /> <br />Peak Discharges (cfs) <br />10 sa 10.0. 5eO <br /> <br />12000. <br /> <br />1200.0. <br /> <br />11800 <br />1180.0. <br /> <br />165 <br /> <br />165 <br />165 <br /> <br />32 5'~ <br />32 5'~ <br /> <br />3251' <br />3251: <br /> <br />190* <br />140. <br /> <br />15800. <br /> <br />15800. <br /> <br />1490.0. <br />1490.0. <br /> <br />70.0. <br /> <br />610 <br />610. <br /> <br />150.0 I, <br />150.0 ;, <br /> <br />110.0': <br />600.': <br /> <br />60.0' <br />60.0. <br /> <br />18300.' <br /> <br />18300. <br />1700.0. <br />170.00 <br /> <br />10.75 <br /> <br />1000. <br />10.0.0 <br /> <br />2900.* <br />2900* <br /> <br />230.0* <br />650* <br /> <br />10.0.0* <br />925 <br /> <br />2S00.0. <br /> <br />2S00.a <br /> <br />27000 <br />27 Illl 0. <br /> <br />300.0 <br /> <br />290.0. <br />2900. <br /> <br />6~)OO* <br />6')00. * <br /> <br />560.0.* <br />'10.0* <br /> <br />Z800* <br />2400. <br />