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I I I I I I I I I I I I I I I I I I I BATTLEMENT MESA DEVELOPMENT STORM DRAINAGE AND FLOOD PLAIN STUDY JOB NO. 926.010 I. General The Battlement Mesa Development will be a residential community designed primarily to provide housing for the work force associated with the oil shale industry developing in the Grand Valley - Parachute Creek area. The project area consists of approximately 3,000 acres located southeast of Grand Valley, Colorado, on a plateau situated easterly of the Colorado River. The project lands and development plans analyzed by this study are those included in the P.U.D. Plan which will be submitted to the Garfield County Commissioners on March 17, 1975. The largest single drainage aspect of the site is the Colorado River which traverses the west boundary of the project. A formal Flood Plain Analysis of the Colorado River ~s presented in Part II of this study. The methods used for flood- plain delineation are consistent with those recommended by the Corps of Engineers and Federal Insprance Administration. Flood plain maps showing the extent of the floodplain, the profile of the 100-year flood and selected cross sections are included in the drawings appended to this report. The remainder of the site is drained by numerous, small and indefinite drainageways across the majority of the plateau area. Battlement Creek skirts the eastern-most boundary of the project. The creek is confined to a deep, steep-walled channel and, therefore, does not present any flood plain hazard. Likewise, Dry Gulch skirts the south boundary of the project in a deep, steep-walled canyon and does not present a flood plain hazard. Monument Gulch passes through the project near the south '~nc1 and must be dealt wi th as discussed in the following sections of this study. The Local Drainage Study, presented in Part I of this report, deals with treatment of drainage under future conditions of full development on the site. The plan is based upon the