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<br />e <br /> <br />.<':;"'-~-.... <br /> <br />e <br /> <br />e' <br /> <br />derived using the same methodology as theav!:rage annual equivalent damages. Post-project <br />analysis will use the same inventory base as the pre-project analysis, such that benefits will be <br />based on the lower flows resulting from the projects. . Benefit analysis is expected to use the same <br />computer methodology as the average annual damages, with a change in flows for each event. <br />There will be approximately four differing levels of protection, based on differing channel, levee <br />or dam types. <br /> <br />k. NED PLAN. A National Economic Development (NED) plan will be developed to <br />select the appropriate alternative for design. Costs will be annualized and compared to benefits to <br />derive the net benefits. <br /> <br />I. ANALYSIS OF NON-STRUCTURAL ALTERNATIVES. Non-structural alternatives <br />(e.g., floodproofing) will be analyzed to determine if any are viable. Non-structural alternatives <br />include floodproofing or elevating structures. 'The Sacramento District non-structural program <br />will be used to estimate costs. <br /> <br />m. RISK ANALYSIS. The accuracy of the Corps' estimates is dependent on several <br />assumptions and best estimates. Risk analysis will be performed in accordance with ER 1105-2- <br />101 to determine the impacts of a change in assumptions and to incorporate the standard deviations <br />of some of the estimates. The primary variables will be assumptions of the structure and content <br />values; existing structure elevations; and depth percent damage relationships, and components of <br />the hydrologic and hydraulic assumptions. Structure and content standard deviations will be <br />derived from local information, interviews, and sin1ilar area data; existing structure elevation <br />standard deviations will be estimated based mapping and field data in accordance with ER 1105-2- <br />101; depth percentage damage relationships will be based upon Federal Emergency Management <br />Agency National Flood Insurance Program data, as well as internal estimates and work of other <br />Districts. There will be an estimated four damage reaches, and four levels of protection. The data <br />will be integrated and annualized, using the HEC Risk program. <br /> <br />n. REPORT DOCUMENTATION. To present the report to the public and the Corps' <br />review authorities, a succinct narrative report of the economic evaluations discussed above shall be <br />prepared in accordance with applicable regulations. Documentation of the source material and a <br />display of the results of the economic analysis will be presented. <br /> <br />o. MEETINGS AND COMMENTS. An economist will attend approximately three <br />meetings to present aspects of the report to the public and the Corps' higher authorities. The <br />feasibility report will document and address suggestions and comments generated from these <br />meetings. In addition, an economist will attend in-house team meetings scheduled during the <br />study. <br /> <br />..-. <br /> <br />p. QUALITY CONTROL. The quality control (QC) processes described in the QC Plan <br />will be performed for all work, including an independent technical review of all products. <br /> <br />2.12 ENVIRONMENTAL COMPLIANCE. This item shall be performed by the Government. <br />The Florence, Colorado, flood control feasibility study shall comply with all applicable federal and <br />state statutes and regulations that protect the quality of the natural and human enviromnent. The <br /> <br />SECTION B, PAGE 16 <br />