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that must be kept free of encroachment so that the 100-year <br />can be carried without substantial increases in flood <br />_.. linimum...Eederal standards limit such increases in flood <br />: Co, 1.0_ foot, prove ed ehat hazardous velocities are not <br />,d, <br />^~_ <br />F . <br />%.r <br />,,~ <br />~. <br />°~; <br />.5.0 <br /> <br />'~I,_po~ways -for ail streams studied by detailed methods were <br />_~com'puted -on the basis; of equal conveyance reduction from each side <br />'- q~,,,xha. f1o`odpLaiii,,,,_ The results of these computations are tabulated <br />>'at.,,selecfed cross sections for each stream segment far which a <br />~~- floodway is.'computed (Table 2). <br />{ . <br />.€ <br />A £laodway is not shown 'for U.S. Highway 34 Levee Overflow Channel <br />because-.£-+L•ooding in _this area is controlled by. the South P1atEe <br />'~7 ~;~; _ <br />Noy flaod'~zay was~'compuLed for the detailed study reach 'of the Big <br />nj ..k~Thbmpson ~Rrver~ '- ~ ~~ <br />s, - .~ , <br />.... ._. <br />'r_ ,..,_ <br />7[sc shoes " n `'rhe °'E7 ood. Boundary and Floodway Map, the floodway <br />_~(ioundarie-s:_,_wez_e• ,;determined. at cross sections; between crass <br />~x ~'sectionsr~;,the,,boundaries were interpolated. In cases where the <br />flood'way;;aiui-;1'00-year flood boundaries are close together, only the <br />floodway.bgundary has been shown. <br />-_, ___, <br />The zrea between the floodway and the boundary of the 100-year <br />flood is, termed the floodway fringe. The floodway fringe thus <br />encompasses the. portion of the floodplain that could be completely <br />obstrncted -*aithout increasing the water-surface elevation of the <br />I'00-year ` f-Lood•-more than 1.0 foot at any paint. ~ Typical <br />relationships :between the floodway and the floodway fringe and <br />their°sgnficance:.ta.:floodplain development are shown in Figure 5. <br />INSURANCE APELICATION <br />In order to establish actuarial insurance rates, the FEMA has developed <br />a process to transform the data from the engineering study into flood <br />insurance criteria. This process includes the determination of reaches, <br />Flood Hazard Factors (FHFs), and flood insurance zone designations for <br />each flooding.. source studied in detail affecting the unincorporated <br />areas of Weld Cnanty. <br />17 <br />ri <br />«.~»,.» <br />