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<br />to recognize th~t either of these ~ajor flood~ can occur in any <br />yeor. floods larger tha" tho Ste,~d"rd Project flood ~re possible, <br />but ehe co~bin'eion of factors neCBooary to produ~e such lergG <br />flows ~o~ld rarely Occur. <br /> <br />~ezerds of Laroe Floods <br />The hazards to life ~nd extent of damage caused by any <br />flood depend on the topography of the area flooded, depth end dura_ <br />tion of flooding, velocity of flow, rate of risa, and developments <br />on the floodplains. Future f100ds of Intermediate Regional or <br />Standard Project FLood magnitude on Fountain Cre~k WQuld inundate <br />residential, com~erciel, end industrial davelop~ente in the area. <br />Fut~re floods of theca ~agnitudes on Jimmy Camp Creek, under existing <br />etete of development, would primarily inundate agricultural l~nds and <br />d~m~ge public roads end bridges. <br />Velocities greater than 3 feat par aecond combined ~ith <br />depths cf 3 feet or more ere gen8r~11y conaidered hezerdous tc lif~ <br />~s well as property. Water flowing i~ p.xcess of 4 feet per secnnd <br />is ce~eblc of tren3porting ~"dim8nt end causing severe erosion of <br />8 tr~e"b"nks e"d f ill "round br idge ~bwtm8nt~. Whete vflloci tiB8 <br />drop below 2 foet por cocond, debrio and silt deposite Can build up, <br />ext~nding the flood damages ~nd creating adverse health oondition.. <br />The saturation effects of long-duration flooding can we~ken bridge <br />ebutnents. levees, and othe, embenknent works so they fail as tho <br />floodwatere recede. <br />Property d~md9~ from 9r8at floodb in d~valop~u areas <br />~"n be overwhelming. Tho onti,s co~;munity 5c.ffers when streets. <br />bridge~. ~aw~rs, end olh~r public wtiliti~~ era da~t,oyad or other- <br />wise made inoperative. Adding to the physical hazarda, a gre~t <br />flood C8n wn18o~h illne~s ~nd deaoly opidemic dieee~e. Sanit~ry <br /> <br />, <br />, <br />, <br />I <br />I <br />, <br />I <br />, <br />, <br />, <br /> <br />the pollution ~nd hazard of epide~ic. N~w~pap~rs som~times repor~ <br />a "lighter side of the ne~s" in picturing children at pley in the <br />lOud ~nd sta"dins water left by a rec<Jding flood. Unfortun~tdy, <br />howe~er, ~he contamin~tiun thre~t to domostic ~~tsr e~pplics c~nnot <br />be ill~etr~ted with ~imi18r ease. <br /> <br />_flooded Ar<!AR ~"I:I ~F~~~d Damaoe <br /> <br />"ewers <br /> <br />becOt'e pressure lines, tllowing ",enhole oovere to "pe~ rew <br />into the ~u~f8~e flcoo.."ters; ~e~~ge trEl~t",..nt. r1'lnt.s ~n.-j <br />line~ Can be wa~hed out: and ~tockyard ~~stes Cen ad~ to <br /> <br />Areas vulnerable to flooding ~y the Stand~rd Preject end <br />Intermediate Regionel floods alOng Fountain ~nd Jimmy C~"p Creeks <br />are indexed on Plate 2 and ~hown on Pl~tes 3 throUgh 42. D~t.. to <br />defins the floods of record throwghout the st'~dy ro"ch were not <br />available. Addition~lly, elev~t1on reference linco are provided <br />~fiich represent tha Intermedi"ta Regi.onal flood's weter surface <br />contour~, generally at 2 foot intervels. By subtracting the ground <br />elevation fron the appropri~te elevation rsference lins, the flood <br />depths at ~ny given location Can be readily determined. more <br />i~portant, ho~'''v~r, those "ievation roferenco lines represent tll<l <br />minimum elevetion for floodproofing standards. Flood profiles <br />shown on Pl~t"s 43 through SS can also b~ woad to esUooate flo~ <br />dapths ~t any givsn location. Typic~l cross sections shown on <br />Pl~tes 56 through 61 WBre eele~ted fro~ approximately ISO ~6ctions <br />obtained by field surveys and photogr~m~etric ~eane. location ~f <br />all crOes sections for both streame ars shown on the profile pl~tes. <br />Strs~m characteristics determined from topogrophio maps, asri~l <br />photographs, uridge pl~ns and valley cross sections were computer_ <br />ized to define the flood situation. <br />floodwater elevstions determined in any particular crose <br />aection aUe ere net always indicativs of elledepth" "'r:tually at- <br />teined. Often, floodwaters becorr.e isolated ~nd entrapped in over_ <br />bank are~8 resulting in flooding depths graater than th03s ~hcwn on <br />the high water profiles. <br />The Intermediate Region~l Flood (JRf) is generally con_ <br />tainsd within tha banks of fountain Creek from th~ ~outh of ~onu~cnt <br /> <br />s.,~'age <br />feode, <br /> <br />" <br /> <br />30 <br />