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To aid in the establishment of flood <br />elevations, Larimer County has established permanent bcnch~arks in the <br /> <br />field. Table 1 lists these benchmarks and related information. <br /> <br />Theloca- <br /> <br />tions of the benchmarks are appropriately labeled On Plates 2 through 10. <br /> <br />1'100<l"ays <br /> <br />" <br />, <br />, <br />. <br />- <br />" <br />, <br />, <br />, <br />, <br />8 <br />" <br />. <br />, <br />. <br /> <br />, <br /> <br />Encroachment on flood plains, such as artificial fill, reduces the <br />flood-carrying capacity and increases flood heights, thus increasing flood <br />hazards in areaS beyond the encroachment itself. One aspect of flood-plain <br />management involves balancing the economic gain from flood-plain develop- <br />ment against the resulting increase in flood hazard. For purposes of the <br />National Flood Insurance Program, the concept of a flaod~ay is used as a <br />tool to assist local cowaunities in this aspect of flood-plain manaKement. <br />Under this concept, the area of the 100-year flood is divided into s <br />flood~ay end a floodway fringe. The floodway is the channel of a stream, <br />plus anv adja~ent flood-plain areas, that must be kept free of encroach~ent <br />in order that the lOO-year flood be carried without substantial increases <br />in flood heiehts. A~ minimum standards, the Federal Insurance Ad~inistra- <br />tion limits such increases in flood heights to 1.0 foot, provided that <br /> <br />I <br />! <br />r <br />, <br />I <br /> <br />o <br />'0 <br />'0 <br />, . <br />"" <br />.- <br />. <br />'" <br />'" <br />" . <br />o <br />'" <br />" <br />"' <br />~ <br />.. <br />. <br />.. <br />" . <br />"' <br />" , <br />, <br />"0 <br />'0 <br />.- <br />" <br />" . <br />o <br />"" <br />. <br />.0 <br />o <br />oN <br />" . <br />0_ <br />, <br />..;: ~ <br />. <br />. , <br />" <br />., <br />N , <br />. <br />"" <br />.. <br />.. <br />" <br />, <br />, <br />, " <br />. , <br />.. <br /> <br />hazardo,," velocities are not produced. <br /> <br />Larimer County has an ordinance <br /> <br />~hich limits the increase in flood heights to 0,5 foot above the pre- <br />floadway elevation for the plains portion of the county; therefore, a <br />floodway hsving nO mor~ th~n ~ O.~-f~ot ~~rcharg~ has be~n ~elineat~d in <br />this study. <br /> <br />The floodway in this study was computed on the basis of equal convey- <br />ance reduction for each side of the flood plain. The results of these <br />computations are tabulated at selected cross sections for each stream <br />segment for "hich a floodway is computed (Table 6). <br /> <br />The area between the flood~ay and the boundary of the loo-year flood <br />is tcrmed thc flood'..aj' fringc. Thc flood~ay frin!;e thus enCOlnpasses the <br />portion of the flood plain that could be completely obstructed without <br />increa~ing the water-surface elevation of the lOO-year flood more than O.S <br />fcot at any point. Typical relationships b.,twccn the. floodway and th~ <br />floodway fringe and their significance to flood-plain development are sho~~ <br />in Fig. 1. <br /> <br />" . <br />. . <br />" , <br />. <br />, <br />" . <br />" . <br /> . <br />" " <br />, , <br />. c <br />. . <br />. . <br />< 0 <br />- <br />-, <br /> <br />20 <br /> <br />RE:\OURCE: CON\UlT~NT\ INC <br />