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<br />~ detailed study methods. Many communities have flood hazard areas <br /> <br /> <br />which are identified by both methods. Development pressures, <br /> <br /> <br />study costs, and the community's adopted management procedures <br /> <br /> <br />for the flood hazard areas are important factors in the selection <br /> <br /> <br />of an identification procedure and method. <br /> <br />A. <br /> <br />Approximate Studies <br /> <br />~ <br /> <br />Approximate procedures allow the engineer to estimate the <br />area that would be affected by a 100-year flood based solely <br />on existing information. Researching the area's flood his- <br />tory, interpretating topographic features, using handbooks <br />to estimate hydrology (discharge) and hydraulic (depth) <br />characteristics, and obtaining the opinions of a qualified <br />professional (engineer, hydrologist, etc) are methods used <br />for approximate studies. The intent of such studies is to: <br /> <br />-12- <br /> <br /> <br />a} provide a reasonable estimation of the potential <br />flood hazard at any proposed building site, <br />b) minimize the engineering and planning costs to the <br />user: and <br />c) fulfill the regulatory requirements of local govern- <br />ments in the National Flood Insurance Program. <br /> <br />The studies are based on a minimal amount of technical data <br />and are used under the following conditions: <br /> <br />~ <br />