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to reco9nil0 th~t oither Qf tnose m~jo:: floods c~n occ'~r ir> a"y ye"r. ; lo~dc l"rg~" th~n t~" ~,t~"de~d P~o~"ct f 10001 ~r~ pos~i~le. uuL lI,~ _u"1.i.",~l~u" wr r~d'Cl~ "~'_~~,~lY ,u ~l'udu~~ ~u~h la"~\1 th~ pollution ,nd h~?"rn elf ~(,.i.,j~",,~. ""'",~r"~~" sC~Cti'l'~~ 'w,'ud ~ "li"I,t"r side cf the ne~s" in pid~rirtg cnildre" :ot pby in the ~ua ~rt~ st~nding w~'b, left ~y a receding floo~. U~for,un3tely, ho"'ev~r, t,,~ c{J"h'";~~ti,,'" t~~~~t ~" :b,"'o~tLc w~tn s~;;pl.i.e~ cannot be illustr~tad ~ith oimil~r ease. flo~" would r:oreIy accu~. Ha2aro~ of Lar~e F!oart5 Th~ hBza~d5 ~a life and ~xtent of damage caueed ~y any Eood dep~nd on the topogr~~hy of the ~rell rlood8d. dupth or\d d'~ra- tion of flooding, velocity of flow, ,ate of rise, and developments on the flood plains. Futuro floodo of Intormediate Rcgional Or Standard Projeot Flood magnitude on Fountain Cr~ek would inundate residential, oommercial, ~nd industrial development6 in the ~rea. future flocde of these mognitudes on Jimmy Camp Creek, under existing state of devolopment, would primarily inundate agricultural lands and damag8 public roads and bridges. Velooitioo grootor than ~ feat per ~econd oombinsd with d~pth~ of ~ feet or moru llre g~nur"lly considered h'lZ~rdous to life ~~ well as property. W~tsr flowing in excess of 4 feet per second is capable of transporting sediment end causing severe erosion of streambenks and fill around bridge abutments. Where velooities drop below 2 feet per second, dabris and silt deposits Can build up, extending ths flood da~agas and creating edverse health conditions. The eaturation sffeote of long-duration flooding can weaken bridge abutmente, leveeS, and other embankment works so they feil ae the floodwater~ reoade. Propsrty damage from grs~t floods in d~veloped areos Can be overwhslming. The entire oommunity euffers when strests, bridges, sswers, and other public utilities ore destroyed Or other- ~i5e mode inoperative. Adding to the physical hazarde, a great flood can unleash illness and deadly epidemic disease. Sanitary flooded Ar<'~~ ""0 "lood D?m~o~ sewors become ~reS5ure line5, blowing manhole oovers to spew raw into tie surf~ce floodwaters; sewage treet,"ent plants and Areas vulnerable to flooding by ~n~ Standard P~ojeot and Intcr"'adiate Ragionlll flooO:s along fountain and Ji,"n1Y C~~p Creek" a~e indexed on Plate 2 and Bhown On Pl"t~s 3 through 42. ,j)"u. to Os fine the floode of reoord throughout the study reech were not available. Addition"lly, el~vetion ~eferen~e lines are provided which represent the Intermediate Reg~onal flood'~ water surfec8 contour., gsnerally at 2 foot interval~. By s~btracting ths g~ound elevation from the app~opriate ~levation refer~noa line, the flood depths at any given lOG~tion can be readily dcterminod. Mor~ important, howeve~, thece Blsvation r"ferenc~ line~ r8Present thp mini~um elevation for floodproofing standards. flood profilee ~hown on Plates 43 through 55 Oan al~o ba uead to estimate flo~ depths at any given locetion. Typioal crOsa seotions shown on Plates 56 th~ough 61 wsre eelectsd from approxim~tely ISO sections obtained by fisld survey~ end photogr~~metrio M~ane. Loc~tien Qf all cross sections for both strsams ~re shown on the profile plat~s. Stream oha~acteristics determined f~om topogrephic mops, aerial photographs, b~1dge plana and valley cros~ seotions wc.e computer- ized to define the flood eituation. floodwater elevations dete~~ined in any particular cross ee~tion area ere not al~ay~ indioative of the d~pth~ ~otually at- tain~. Often, floodwaters become. isolat~d and ent~apped in ov~r- b"nk ar~a~ resulting in flooding dopth" 9~eutsr th~n tho5,., ~hown Qn the high w~ter profilee. Thp Jnt~rm~~i~t~ Regional fl~od (JRf) i~ ;cncrnlly o~~_ teined ~ithin the banks of fountain Cr~ek from the mowth of Monu~ent s"w~ge feeder line~ o~n be washed out; and stookyard westea Can add to " "