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I I I I I I I I I I I I I I I I I I I The area beneath the flood damage curves represents the average annual flood damage. This is the yearly cost of leaving the existing conditions as they are. Listed in Table IV-1 are the average annual flood damages summarized by jurisdiction. These are the "baseline" conditions against which the alternative plans were judged. TABLE IV-1 AVERAGE ANNUAL FLOOD DAMAGE BY JURISDICTION Jurisdiction Reaches Alternatives Adams County land 2 36,400 + 9,900 = 46,300 Prior to the expenditure of public funds by the Urban Drainage and Flood Control District and participating local governments for flood control projects, the most feasible plans must be identified. To this end the following flood control plans were considered on a reach-by-reach basis for implementation on the Direct Flow Area 0054 drainageway: City of Thornton 3 and 4 27,700 + 49,600 = 77,300 123,600 A. Maintain the existing configuration. B. A natural type waterway (where feasible) following the general historic channel determined from old aerial photographs, old mapping, and from local records. C. The installation of major underground conduits along the general course of the historic stream channel, using local right-of-way whenever possible. D. The use of lined flood channels to reduce right-of-way requirements. E. Selected or limited structural improvements or additions (Culverts, bridges, irrigation crossings, etc.) and channel improvements (re- alignment, erosion control, low flow protection, maintenance access velocity control, and so forth). F. Detention and/or retention facilities. G. Acquisition of flood prone properties and relocation of occupants. H. Non-structural methods such as flash-flood warning, flood insurance, evacuation plans, etc. I. Relocation of the channel to routes other than the historic channel. J. Other Plans as suggested by participating entities. K. Combinations of the preceding. TIr-2