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<br />GUlDELINEsrORrLOQOPLA!NMANAG(M(t.iT <br /> <br />~an has been bvildi~9 on and oc~vpying the flood p~ains <br />of rivers a~d sm~ller streams since the arrivei of the pionee. set- <br />tle.s. The st.eams first provided t~anaportatioo aod ~ater supply <br />and, late~, thei~ usually gentla v~lley g~~das aocou~~ged the con_ <br />st~uction of highw~ys and .ail.oads. Today, the continuing g.o~th <br />of citiss .esults in eve~ incrsasing enc~~~chment on the flood plains. <br />Th.ough bitte~ oxpecience, m~n has lea~ned th~t floods <br />pe.iadic~lly inund~te rartions of tha flood plain, d~maging pro~e~ty <br />~nd oHeo causing io;s af life. V"st noney "nd material .eSQutces <br />have been expended for structural flood control projects--dams ~nd <br />reservoir.. levees, chao~el improvements, and similar protectivs <br />works__designed to secu~e man's habitat against the force of ~atwre's <br />floods. U~fortuoately, however, e~c.oachment on the flood plaios <br />has t~ken place faster than control st~uoturS$ CaO ba built and <br />costly flom! damages hAve cooti~u"d to i"creas~ across the nation. <br />This inoro~se h~5 led to e ne~ approach for reducing flood da~~gos. <br />C"lLed ~flood ?l~in ",a~~ge,"ent,~ this ~"" app.osch consists ef ap- <br />plying controls ove~ the use of the flood p.o~e l~nd ~hich lies <br />aJj~"~,,i,. lu I,.I,~ ,"aL~""uUl~~~. <br />Guidance on va~ious flood plain management tach~iques <br />that CeO bB ~dopt"d in a ""'alistic flood d"'""g" r..duction program <br />is preseot8d in th.. following t$xt. Spacifio recommand~tions fo~ <br />imolementi~g Bny pnrtioulo. t~choiqus are not provided, ho~ovor, <br />"s such option g""er"Uy remains the re.ponsibility of loc~l com- <br />munity, county, o~ State gov..rniog aga~ci.,s. <br /> <br />, <br /> <br />InterDret~tion of Dat~ <br />flooded a.ea "'1P~, profiles, e~d selected crOS5 seC- <br />tio~5 a... provided in the report to ~efir.o the li~it3 of flooding <br />that ~ould ocCu, duri~g ~n Inter~Bdiate Regional flood or Sta~d~~d <br /> <br />" <br /> <br />Project rlood. Hypothetic~l examplae of these preeantation~. de- <br />picting the ~real limits and elevation6 of the ~8spective futu~a <br />floads at ~n imagin~ry location, are show~ on the oppasite page. <br />Th" later~l limits of floodiog from the Inter~~di~te <br />Regional flood (IRr) are shown by the blue-~haded area, ~hiie the <br />solid blue ~rea iodicates the additional area that ~OUld ba ioun- <br />dated by theStsndard Project Flood (SPf). The flood profile shows <br />the tel~tive depth of floouwate~s aloog the ceoterline of the <br />stream. The cro~s ~ectioo exa~ple indicata~ the depth aod lateral <br />extent of flooding th~t would occut ~t the specified cross ;ectiDo~ <br />athe~ info~matiDo on floadflow depths et the loc~tioo of the crass <br />section is tabulated below. Similar data can be developed for any <br />flood plaio location in the study reach coneidered in this report. <br /> <br />, <br />\ <br />j <br />, <br />I <br />, <br /> <br />Locatioo <br /> <br />Dist..~ce f,~ Depth of Floodwater <br />Stream Cante~~ioe .!!lL '" <br />feet feet feet <br />" 3.' $.1 <br />'" U 3.' <br />bO '.0 <br /> <br />Paint A <br /> <br />Point 8 <br /> <br />PointC <br /> <br />8y using information as illu$t~ated abov", together with <br />other data such as f~equency of occurreoce. velocit~ ot t.ow, aod <br />duration of flooding, coocc~ned individuals ca~ mako knowledgaabl9 <br />decisioos relative to tho us.., developme~t. aod m8~og"m"nt of area~ <br /> <br />~ubjQ~t to i~~~dQtio~. <br /> <br />Zu"i.-.~ <br /> <br />Con~tituting ~ leg~l tool that CBO be used ta implemeot <br />and enforcR the detailed ple~~ r95ulting f.om e land woe pl~nning <br />progr~, aelectiv~ zoning ensures the most beneficial use of fiood <br /> <br />" <br />