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<br />the T~~':.e on F~~~~)'lood COntrQI_t~licy. House Document No. 465 <br />(89th Congress, August 10, 1966), ellp€cially RecrernendaCion 9(c), <br />ReWJI~tion of 4:.!.<LUse, v.hich recOO1'nended the preparation of preliminary <br />reports for guidance in those areas vbere assistance is needed before a <br />full flood plain information report can be prepared or were a full rep0lCt <br />is not scheduled. <br />Authority for funding flood plain management studies is provided by <br />Section 6 of Public Law 83M566, .tlid1 author1~es the U.S. Department of <br />Agriculture to cooperate with other federal, state and local agencies to <br />make irwestigations and surveys of the watersheds and rivers and other <br />waterways as a basis for the development of coordinated programs. In <br />carrying out flood plain managmlent studies. the Sol1 COnservation Service <br />is being responsive to Executive Order 11988, mtitled ''Flood Plain <br />Management". and Executive order 11990, entitled "Protection of Wetlands" <br />(both effective May 24. 1977). <br /> <br />DESClUPTlOO OF 'lHE $11JlJY ARi'.A <br />Basin Characteristics <br />This study irNolves 10 tributaries to the COlorado River rotaling <br />aboot 27 miles of stream. 'I\,Qofthetributllriesareadjacenta.ndlocated <br />north of the Colorado River. Their northern b:lundaries reach an elevation <br />of aboot 10,000-11,000 feet near the Garfield-Rio Blanco COlJlty line in <br />the White River National Forest. These tributaries flow in a southerly <br />direction to the Colorado River at an elevation of about S,SOo.-5,600 feet. <br />The rE!llaining 8 adjacent tributadea are south of the COlorado River. <br />Their aoothern bowdaries reach an elevation of about 9,000.-10.000 feet <br />with parts of their drainages extending into ME-sa COunty, These <br />triootaries flow in a northerly direction to the Colorado RIver at an <br />elevation of aboot 5,200M5,600 feet. <br />The topography is primarily plateauMlike table land deeply cut by <br />watercourSell Iohich form steq> canyons, The region is rich in coal all:! oil <br />shaIedeposits. <br />The cUmate of the area is influenced by Pacific storm systems that <br />move frem west to east. The nearest national weather station, <br />["epresentativeofthel~rpartofthebasin, isatGlenwo:.xlSprings. <br />The m.!&l anl'll.lal. tanperature is 480F with about 138 days of growi1'"@: season <br />between the spring aoo fall 32"F frost occurrences. The lOC'an annual <br />precipitation is just over 16 ind1es. This increases to about 40 inches <br />at the higher elevations of the northem tributaries and 30 inches for the <br />southl!m trib..Jtaries, \"intenime precipitation is usually in the form of <br />snow during OCtober to early April. <br /> <br />4 <br /> <br />3 <br />