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I I I I I I I I I I I I I I I I I I I 18 V DESCRIPTION OF THE ALTERNATIVE PLANS FOR DEVELOPMENT Recommendations from the Phase A Report 1. The one-hundred year flood should be adopted as the cri- terion for the construction of facilities. Such facilities should be planned, where necessary, to insure that damages resulting from the conveyance of the 100-year flood by the channels would be essentially non-existent. This would ensure that most properties presently subject to potential flooding would have at least protection from the one hundred year flood. General A number of possible master plans of development for Lakewood Gulch were considered in a report titled "Major Drainageway Planning for Lakewood Gulch, Phase A, Development of Alter- native Plans," (Reference 5) dated December 1975; Revised January 1976; and in an Addendum to this Phase A report (Reference 6), dated March 1979. The alternative plans were developed after a detailed analysis of the damage potential, the costs of the alternatives, and the benefits to be derived by the construction of the facilities. The analysis indicated that the construction of facilities to convey the one hundred year flood is not necessarily cost-effective in terms of the cost benefit ratio, when this ratio is calculated using only flood damage reduction as a benefit. The cost for acquisition of an easement for maintenance access is included in the cost because the easement is needed by the Urban Drainage and Flood Control District and the Cities of Denver and Lakewood to main- tain the drainageway in a satisfactory manner. While benefits are derived from the provision of maintenance access, they were not quantified into values and were thus not incorporated into the calculated benefits. 2. The areas presently anticipated to be inundated by a one hundred year flood (after construction of improvements) should be regulated. Additional development of flood prone lands, or development which would increase the flood hazard, should be prohibited. Residents of flood prone areas should be apprised of the potential hazards and the available interim protective measures, including flood insurance and flood-proofing techniques. Flood warning and community preparedness programs should be continued. 3. The portions of the channels which presently have the capability of conveying the one hundred year flood should be regulated so that no future development or channel constrictions are allowed to decrease their capabilities.