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<br />I <br />I <br />I <br />I <br />I <br /> <br />Page Three <br />Battlement Mesa Development storm Drainage and Flood Plain Study <br /> <br />of drainage facilities. The use of open, <br />natural-type drainageways will be encouraged <br />whenever feasible to maintain open space in its <br />natural condition. <br /> <br />7. Extreme care will be taken to prevent erosion <br />of channels and possible failure of drainage <br />facilities due to sedimentation. <br /> <br />PART ONE - LOCAL STORM DRAINAGE <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />II. Design Rai~fall <br /> <br />Design rai:~fall values for the Grand Mesa area for storm <br />drainage design purposes have not been fully developed. Several <br />existing technical publications were reviewed and analyzed <br />to develop a de:3ign rainfall procedure for the Battlement Mesa <br />project. Publications consulted are as follows: <br /> <br />"Precipitation - Frequency Maps for Colorado," <br />prepared by Special Studies Branch, Office of <br />Hydrology, Environmental Science Services <br />Administration - Weather Bureau for Engineering <br />Division, Soil Conservation Service, U. S. <br />Department of Agriculture, October, 1967. <br /> <br />"Rainfall Intensities for Local Drainage Design <br />in Western United States",Technical Paper No. <br />28, U. S" Department of Commerce, U. S. <br />\'7eather Bureau. <br /> <br />I <br />I <br />I <br /> <br />Urban Storm Drainage Criteria Manual, Denver <br />Regional Council of Governments, March, 1969. <br /> <br /> <br />I <br />I <br /> <br />"Rainfall Frequency Atlas of the United States", <br />Technical Paper No. 40, prepared by David M. <br />Hirschfield, Cooperative Studies Section, <br />Hydrologic Services Division, U. S. Department <br />of Commerce, \'!eather Bureau for the Engineering <br />Division, Soil Conservation Service, May, 1961. <br /> <br />The primary problem with determining design rainfall <br />values for storm hydrology in western Colorado is the lack of <br /> <br />I <br />I <br />