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<br />. <br /> <br />. <br /> <br />. <br /> <br />results and the on-the-ground conditions is a major <br />factor to accomplish this. This can be done <br />through: <br /> <br />. <br /> <br />Uniform Datum Standards The base levels, ele- <br />vations and mapping may be tied to a single local <br />datum1 however, it is preferrable they be tied to <br />the National datum ("Mean Sea-Level" (MSL) for <br />vertical datum and State plane Coordinates for <br />horizontal datum). By tying to the National <br />datum, uniformity is maintained within the Re- <br />gion, the State and the Nation. <br />Benchmarks -- Permanent elevations can be estab- <br />lished in the field through a program of monumen- <br />tation (see Glossary) in the field. This can be <br />accomplished easily by using federally estab- <br />lished benchmarks where available. At times, <br />however, federal benchmarks do not exist within a <br />community. In those cases, it is benificial to <br />construct a control marker network within the <br />community. By having control markers with known <br />elevations throughout a community, property <br />owners can more easily and accurately determine <br />their own floon hazard risks through conventional <br />field surveying procedures. <br /> <br />. <br /> <br />-30- <br />