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I I I I I I I I I 'I I I I ~I . I I I I I -3- -4- Information Obtained Basin Features Agency Urban Drainage and Flood Control District Detailed topographic field surveyed data for mapping; most of Weaver Creek is located in T5S, R70W, T5S, R69W, and T4S, R69W, as shown on the Basin Hap included with the drawings. It drains an area of 6.5 square miles eastward from the foothi 11 s of the Front Range, to the confluence wi th Bear Creek. The Hogback Ridge forms the divide between the upper and lower reaches. The channel slope averages 5.6 percent for its 8.1 mile 1 ength. Upstream of the Harriman Canal, the drainageway is called Weaver Gulch, downs tream it is called Weaver Creek. Principle land uses within the flood hazard area include agriculture, transportation, recreation and residential development. the crossing structures; drain- age reports for several existing and proposed subdivisions; local government boundaries; Jefferson County's floodway criteria and land use plan for the basin. U.S. Army Corps of Engineers None U.S. Geological Survey A preliminary copy of their new technique for determination of flood hydrology and feedback on the CUHP method. Service Soil s maps and curve numbers for the soils associations in the basin. The status of channel and The upper basin is steeper and narrower, and a major portion of the developable area is subdivided as the Willowbrook Subdivision. The upper basin extends to an elevation of 7,965 feet. The channel slope approaches 25 percent near the upstream limits of this study, and averages 9.6 percent. U.S. Soil Conservation Colorado State Highway Department Design culvert information on the under U.S. Highway 285. East of the hogback, the geologic flood plain is much wider, although the 100-year flood hazard area is generally confined within narrow limits. The channel slopes are flatter, averaging 1.5 percent. The lower basin is approximately 60 percent platted, and the larger subdivisions include Harriman Park and Friendly Hills. Channel improvements have been constructed in connection with both of these developments. At the time of the original study the channel improvements were not continuous, but this situation has since been corrected. Jefferson County crossing structure improvements and base maps showing existing platting within the basin. Denver Water Department Elevation-Volume curve and for the the Several reservoirs exist within the basin. The three onstream ones, located below U.S. Highway 285 are relatively small, and the spillways of the two larger ones are severely damaged. Harriman Lake, an offstream reservoir owned by the status of improvements Harriman Lake, and status of irrigation function of Harriman Canal. ~ Leonard Rice Consulting Water Engineers, Inc. ~ Leonard Rice Consulting Water Engineers, Inc.