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<br />MANAGEMENT MEASURES <br /> <br />Plans for flood control and flood damage prevention should include a full <br />range of strutura1 and nonstructural alternatives. Structural measures are <br />those works constructed to control, divert, or exclude the flow of water from <br />flood-prone areas. Such measures preclude damage to property, reduce the <br />hazards to life or public health, and minimize general economic loss. <br />Structural measures are designed to provide a specific level of protection and <br />they provide very positive results. Nonstructural measures are actions which <br />reduce flood damages by acting on the property subject to flooding. Such <br />measures include the exclusion or removal of damageable properties from flood <br />situations. Active measures, such as floodproofing individual structures or <br />establishing a flood warning system, with procedures to effect temporary <br />evacuation of the area, can be implemented. Passive measures, such as the <br />purchase and removal or relocation of flood-prone property, are technically <br />and pratical1y feasible. Floodplain regulations and zoning regulations are <br />examples of a nonstructura1 alternative designed to prevent damage to future <br />development. <br /> <br />FORMULATION AND EVALUATION CRITERIA <br /> <br />Technical, economic, environmental and social criteria have been established <br />to guide the formulation and evaluation of the plans and measures. These <br />criteria are discussed in the following paragraphs. <br /> <br />Technical Criteria: <br />primarily for the <br />consis-tent with <br />features, such as <br />project integrity. <br /> <br />The technical criteria establishes project dimensions, <br />structural measures, and assures that a plan would be <br />local flood protection plans. Necessary engineering <br />adequate erosion control measures, are included to insure <br /> <br />Structural flood damge reduction plans for the Alamosa area have been <br />formulated for a level of protection that provides an acceptable degree of <br />risk to health, life, and safety. For urban areas where damages from large <br />floods would result in a catastrophe, the standard project flood (SPF) level <br />of protection has been generally sought. This is particularly applicable to <br />projects comprised of high levees, high f100dwa11s, or rapid flow channels <br />because of the threat to human life resulting from the levees or floodwal1s <br />being breached or overtopped or resulting from the high velocity flows leaving <br />the channel. For urban areas where the potential of a catastrophic failure <br />from a flood greater than the design flood was small, alternative levels of <br />protection are being considered and evaluated on their effects on health, <br />life, and safety. <br /> <br />Economic Criteria: To satisfy the economic criteria, flood control plans for <br />Alamosa must, as a minimum, produce tangible benefits at least equal to their <br />cost. Potential plans should be sized to maximize their net benefits. These <br />criteria are aimed at developing a plan which achieves the objectives of <br />national economic development (NED) and provides a basis for evaluating other <br />unquantifiab1e economic factors impacting on project proposals. The estimated <br />cost of the plans reflect current price levels. The project costs are <br />annualized using an appropriate amortization period and the current interest <br />rate established for evaluating Federal water resource projects. <br /> <br />15 <br />