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I I I I I I I I I I I I I I I I I I I 10 also taken perpendicular to the natural drainage way, but at shorter reaches than the reaches mentioned above. Also, as stated above, only the open area in the cross section was considered effective for flow conveyance. FLOOD HAZARDS Critical flow occurred at several locations in the water surface profile computations. Critical depth was assumed at those sections. The 100-year flood event is considered by the State and the District as the flood magnitude for which flood plains should be designated for regulatory and improvement purposes. The 100-year flood plain limits and water surface profiles are shown on the Flood Hazard Area Delineation Maps. As described previously, between 11th Ave. and Stapleton International Airport, Westerly Creek currently has capacity for less than a l-year frequency storm event, and there is little or no flood plain remaining because of the existing development. Any storm event will cause damage to adjacent properties (residential and commercial areas). Hazards associated with a 100-year flood event would include damage to structures and their contents, traffic interruptions, loss of crossing structures, and even loss of life. The 108-inch pipe with the natural detention pond which exists immediately south of the runways at Stapleton International Airport can only contain an 8-year or smaller flood event. Flight schedules could be interrupted by a 100-year flood event. Kelly Road Dam is located upstream of the study reach. Based on our review of Kelly Road Dam according to the State Engineer's "Plans and Specifications for the Construction of Reservoir Dams", the present dam structure is a hazard from the standpoint