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<br />Example Benefit-Cost Analysis <br />The example is based upon the Little Dry Creek Master Plan project <br />located in Douglas and Arapahoe Counties, Colorado, undertaken for the <br />Urban Drainage and Flood Control District [15J by the firm of McCall- <br />Ellingson & Morrill Inc., consulting engineers, as assisted by the firm <br />of Lyon, Collins & Co., Inc., local governmental consultants. This basin <br />was chosen as a case study because of the varied conditions encountered <br />and the detail of the analysis conducted. To broaden the scope of the <br />example, certain elements and conditions not found in the Little Dry Creek <br />basin have been added. It must be emphasized that each project will <br />present a unique situation in terms of flood hydrology, development charac- <br />teristics, alternative solutions and other features, therefore the step- <br />by-step description must be considered as a guide to performing benefit- <br />cost analysis and not as a rigid formula. As in other portions of the <br />urban drainage master planning process, a significant degree of engineering <br />judgment is required to achieve an acceptable and realistic solution. <br /> <br />Step 1 - Examine Flood Hazard Area and Classify by Land Use <br /> <br /> <br />The following types of land use are typical: <br /> <br /> <br />Land Uses - Little Dry Creek Basin <br /> <br /> <br />A. Public streets, bridges, culverts and utilities. <br /> <br /> <br />B. Public unimproved open space. <br /> <br /> <br />C. Public improved open space. <br /> <br /> <br />D. Private unimproved open space (grazing). <br /> <br /> <br />E. Private improved open space (farming). <br /> <br /> <br />F. Single family residential. <br /> <br /> <br />G. Multi-family residential. <br /> <br />57 <br />