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<br />these computati ons were tabul ated at sel ected cross secti ons for <br />each stream segment for which a floodway was computed (Table 2). <br /> <br />As shown on the Fl ood Boundary and Floodway Map, the fl oOdway <br />boundaries were detennined at cross sections, and between cross <br />sections the boundaries were interpol ated. In cases where the <br />floodway and 100-year flood boundaries are close together or <br />col inear, only the floodway boundary has been shown. <br /> <br />The area between the floodway and the boundary of the 100-year <br />flood is tenned the fl oodway fri nge. The fl oodway fri nge thus <br />encompasses the portion of the flood plain that could be completely <br />obstructed without. increasing the water-surface elevation of the <br />100-year flood more than 1.0 feet at any point. Typical relation- <br />ships between the floodway and the floodway fringe and their <br />significance to flood plain development are shown in Figure 2. <br /> <br />I- <br /> <br />100-VEAR FLOOD PLAIN <br /> <br />., <br /> <br />FLOODWAV <br />FRINGE <br /> <br /> <br />FLOOOWAV <br /> <br />FLOODWAY <br />FFUNGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOaOWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />SE usee FOR DEVELOPMENT BY <br />'RAISING GROUND <br /> <br />FLOOD ELEVATION <br />BEFORE ENCR()ACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AB IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CO IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />. 9UACH"ROE 18 NOT TO EXCEED I. 0 FOOT I FE.... REQUIRE..ENTI OR lESSER ....OUNT IF SPECIFIED BY ST..TE. <br /> <br />FLOODWAY SCHEMATIC <br /> <br />Figure 2 <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, Federal Emergency <br />Management Agency has developed a process to transfonn the data from the <br />engineering study into flood insurance criteria. This process includes <br />the detennination of reaches, Flood Hazard Factors (FHF), and flood <br />insurance zone designations for each fl ooding source studied in detail <br />affecting the Town of Del Norte. <br /> <br />9 <br />