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I I I I I I I I I I I I I I I I I I I The regulatory floodway defined in the FrS is depicted on Sheet r of 1. The floodway location was transferred from the Floodway Map of the County, dated January 19, 1978, prepared as part of the FrS. The FrS work maps were also used to locate the floodway limits. A full description of the floodway concept is provided in the FrS. Reconnaissance Study (1985) The Reconnaissance Study was completed by Muller Engineering Company, I nc., on behalf of the City and County, and wi th the cooperati on of the Colorado Water Conservation Board, in October, 1985. The study included a detailed review of the river hydraulics and an estimate of the cost of levee improvements through the City as well as the benefit of those improvements to the City. The study was prepared in response to the high water of June, 1985, and the resulting local concern for flooding. The study included a survey of the right (west and south) levee profile through the community, including Riverwood Estates. Also, Section 28 and other downstream sections were surveyed as part of the study effort. Surveys were completed by Blanca Vista Corporation (Don Knapp), under contract to CWCB. The survey datum was not documented in the 1985 report. The Section 28 surveyed section was used in this eval uati on. The hydraulic analysis was completed using the COE HEC-2 Water Surface Profil e Computer Program wi th FrS study cross secti ons suppl emented with the surveyed sections mentioned in the preceding paragraph. The hydraulic model considered the total flood flow to be confined between the levees. Four river conditions were modeled: 1. Existing (1985) river conditions with sandbars and vegetation ('n'=O.041. 2. River cleared and maintained vegetation free ('n'=O.03). -4-