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<br />B-8 <br /> <br /> <br />evacuation plan. Upon learning the facts, the city governing body could, by resolution, <br /> <br /> <br />adopt this statement to guide further community action, <br /> <br />This new policy would form the basis for more specific plans or regulations, for <br /> <br /> <br />enforcing protective laws to their fullest extent and for obtaining funds and other assis- <br /> <br /> <br />tance to plan and implement a risk reduction program. An initial declaration of policy <br /> <br /> <br />will be refined as high risk areas are studied and more detailed plans are made for reduc- <br /> <br /> <br />ing potential future losses. <br /> <br />Step Two: Assess the General Location and Extent of Hazards <br /> <br /> <br />The second step is to identify and evaluate potential high risk areas, Where are the <br /> <br /> <br />high risk areas in your community? Have there been past flood losses in such areas? <br /> <br />Often considerable public information already exists in the form of flood damage <br /> <br /> <br />reports, flood records, flood maps, newspaper accounts or other historical data to suggest <br /> <br /> <br />where high risk flooding has occurred. If damages have not occurred in the area before, <br /> <br />the potential risk may be unknown. For example, alluvial fans in the arid west are often <br /> <br /> <br />not recognized as high risk areas due to lack of recent flood damage. People living half a <br /> <br /> <br />mile from a small meandering stream may not realize that the stream can change its <br /> <br /> <br />course rapidly. <br /> <br />Hazard assessments can be conducted by emergency management personnel, plan- <br /> <br />ners, city engineers or consultants. Information on hazard assessment is available from the <br /> <br />sources listed in the appendices of the individual chapters which follow. <br /> <br />Step Three: Map High Risk Areas <br /> <br /> <br />Once the general location of a high risk has been identified, mapping is usually <br /> <br /> <br />needed to determine the more precise extent of the area affected. Once areas are mapped, <br /> <br /> <br />regulations and other management measures can be adopted. Maps can be of two types: <br /> <br /> <br />I) General, indicating the area where conditions create the potential for dam- <br /> <br /> <br />age; or <br /> <br />2) Specific, delineating locations of known frequency and level of flooding. <br /> <br /> <br />Generalized maps are useful for initial planning and zoning but often must be <br /> <br /> <br />supplemented with more detailed onsite investigations when development is proposed.Such <br /> <br />a regulatory procedure is incorporated in the single district floodplain zoning ordinance <br /> <br /> <br />proposed in Volume I of Regula/ion of Flood Hazard Areas /0 Reduce Flood Losses. (U.S, <br /> <br /> <br />Government Printing Office, 1971 and 1972.) The general map only establishes the <br />