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<br />b. Designated Floodwa.y is the channel of a watercourse and that <br />portion of the adjoining flood plain required to provide for the passage <br />of a selected flood with an insignificant increase in flood stage above <br />that of natural conditions. Normally, the lOO-year flood (one that has <br />a l-percent chance of occurrence in any given year) would be considered <br />as the selected flood. An "insignificant increase- is nonnally considered <br />to be no greater than 1 foot unless a smaller increase is established by <br />State or local regulation. <br />c. Flood Fringe is that portion of the flood plain between the <br />designated floodway and the natural outline of the selected flood. <br />(This land can be considered for developnent, provided the area is <br />either filled to a required elevation or other floodproofing measures <br />are applied to protect against the flood hazard condition.) <br /> <br />~JLlCY* <br /> <br />To establish a uniform approach to floodway determinations, the <br /> <br /> <br />following guidelinesl are to be used in the initial developmental stage, <br /> <br /> <br />unless State or local governmental regulations have more restrictive <br /> <br />requ i rements : <br /> <br />a. The capacity of the Designated Floodway will be based on the <br /> <br /> <br />dis'charge of the flood that has a l-percent chance of occurrence in any <br /> <br /> <br />gh'en year. <br /> <br />*Excerpts from Reference 2. <br /> <br />lReferences 3 and 4 provide more detailed guidelines for Flood Insurance <br />Studies. <br /> <br />2 <br />