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<br />I <br /> <br />l4 <br /> <br />I <br />I <br />I <br />I <br /> <br />V DESCRIPTION OF THE ALTERNATIVE <br />PLANS FOR DEVELOPMENT <br /> <br />from the conveyance of ten-year floods by the channels <br /> <br /> <br />would be essentially non-existent. This would ensure that <br /> <br /> <br />all properties presently subject to potential flooding <br /> <br /> <br />would have at least protection from the ten-year flood. <br /> <br />General <br /> <br />A number of possible master plans of development for Dry Gulch <br /> <br /> <br />were considered in a report titled "Major Drainageway Planning <br /> <br />I <br /> <br />for Dry Gulch, Phase A, Development of Alternative Plans," <br /> <br /> <br />dated December, 1977. The alternative plans were developed <br /> <br /> <br />after a detailed analysis of the damage potential. the costs <br /> <br /> <br />of the alternatives, and the benefits to be derived by the <br /> <br /> <br />construction of the facilities. The analysis indicated that <br /> <br />2. The areas presently anticipated to be flooded by a one- <br /> <br /> <br />hundred year flood (that is, prior to construction of the <br /> <br /> <br />ten-year facilities) should be regulated. Additional <br /> <br /> <br />development of flood prone lands, or development which would <br /> <br /> <br />increase the flood hazard, should be prohibited. Residents <br /> <br /> <br />of flood prone areas should be apprised of the potential <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br /> <br />the construction of facilities to convey the 5-year, lO-year, <br /> <br />hazards and the available interim protective measures, <br /> <br />or lOO-year flood would be approximately equally cost effective <br /> <br />In terms of benefit-cost ratios. For this reason the report <br /> <br />including flood insurance and flood-proofing techniques. <br />Flood warning and community preparedness programs should <br /> <br />I <br />I <br /> <br />presented three "best alternatives," one each for 5-year, 10- <br /> <br /> <br />year, and lOO-year facilities. The report then recommended that <br /> <br /> <br />the lO-year flood be adopted for the construction of facilities, <br /> <br /> <br />and that regulation of the residual lOO-year flood plain be <br /> <br /> <br />enforced. The report recommended a seven-point plan for de- <br /> <br /> <br />velopment of the major drainageways, which is paraphrased below. <br /> <br />be considered. <br /> <br />3. The portions of the channels which presently have the <br /> <br /> <br />capability of conveying flows exceeding the ten-year flood <br /> <br /> <br />should be regulated so that no future development or chan- <br /> <br /> <br />nel constrictions are allowed to decrease their capabilities. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Recommendations from the Phase A Report <br /> <br />4. During and after construction of the ten-year facilities, <br /> <br /> <br />the areas of one hundred-year flooding should be identified <br /> <br />l. The ten-year flood should be adopted as the criterion for <br /> <br /> <br />the construction of facilities. Such facilities should be <br /> <br /> <br />planned, where necessary, to insure that damages resulting <br /> <br />and regulated. As the facilities are constructed, the one <br /> <br /> <br />hundred year flood plain will decrease in size. After com- <br /> <br /> <br />pletion of the facilities, development within the flood <br /> <br /> <br />plain should be controlled. <br />