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<br />! <br /> <br />cou Id ml ni..i zo less of life and ,""vat I~ property in the; event of (I <br />major/load. Suchaollrrungernentwouldroqulrothet local rlvor <br />and rei nfa I I reports be COl'1rnun !catod prompt 1'( by res~ons I b Ie loca I <br />officials to th.. Weathe~ ServIce ForecaST Office for evaluatloo Md <br />analysis. Ifav3Illlble, this date and anal.,.slswould be used by <br />tha ~'ellther Service to r>Qre accurately forewllrn oorrmun Ity represtln- <br />tativ8S of potential storm 1Ind fiood conditions. <br /> <br />F1JTUREFLOODS <br /> <br />Flood Fighting and Emer~ency EVllculltlon Plans <br />Provisions lor alerting area rl,sidents and coordinatIng <br />county service agencies In tIme of emergency are presently document- <br />ed in the "Colorado Sprlngs/EI Peso County Evalu(ltion-Opel'"atlon PI an <br />(January 1967)." Thepllln'soonceptofoperatloncallstordlssemi- <br />natlonof"heavyralnwarnlngs" during the earliest sti)ges of a <br />flood threat. Subsequent flood fIghting, evacuation, and rescue <br />edlvitles are coordinated on a county wide basis by the Civil ()()- <br />fens€! Control Center which can reque~t State or Federal a~sI5tance <br />should the county resources prove inadequ::lte. <br /> <br />This sectioo of the ra;>ort discusses the 5tMdard <br />Project Flood Ilnd the Intermediate Regional Flood on Cottonwood Cree~ <br />in the vicinity of Colorado Springs, and some of the hazardS of <br />great floods. The Standard ProJec':" flood represents the r"asonable <br />upper limits 01 e>qected flooalng. Floods of Intennediate Regional <br />Flood size my be ox~eGted tQ QGcur more often, but they wi II not be <br />asseverells the infrequent Standard ProJect Flood. Large floodS <br />have occurned in the past on basins of sirnll"r climate ",nd physical <br />charaCreri5tj C5. Gandi tlon~ causi ng He I I oods coul d be re~eated <br />in the Cottonwood Creek basin, the refQre , to determine the flooding <br />pote~tl a I it was neceSS1jry to cons i oer storms ",nO t loods that ~avc <br />oGc'Jr~()c I ~ regions of I I ke -:-op<<;raphy, w1Itershed Gcver, and P."Y$;- <br />cal characteristics. Discussion of tuture tloo05 Ir.'thls repod is <br />Ilmitedtothosethathaveccendesignatedasthelnt€rrncdlateRc- <br />glonal a~d Standard Project Floods. The estlmJtes of InterMdiaTe <br />Reg;o~al a~d Sta~dard ?roject FloodS as p~esented In thi, report ~re <br />besoed o~ t.Jt.Jr~ c<:'ff1dltlcns dS do~eplin"J ,v la"'~ use "."J5 t~r"ished <br />by EI Paso ::;cu~ty, Color~do. <br /> <br />Ictorc<Jdi,,-t'2.....R1ogicm1;l1 Flood <br />The I ~ter"",cl Gte '<eg,ona I Flood i 5 (Jef i r~)d as ,"V- <br />-ng a~ .~verage f,.~y"~~~Y of OCCJrre~ce Gf Qnco in 100 years ~t ~ <br />d..s I""",ted locati on. J IthcJqh i t "~v occur in ~r.y year and pos51~ Iy <br />even I r, Scccoss i ve yeers. The 11fer""""dl ate ""glonGI Flood ~epre5()nts <br />.j '1"':jor flood ",lt~(),_IC)'1 i~ Is les5. sever.e 11'.,)1 the St,]nd~rd Prcjen <br /> <br />f'iooa. <br /> <br />Tr.e~e ~~e ~.o stredm '.i~nirq stction& :n tr.e vlcir.lty <br />0" ""0 stcdy Jrea thaT ~epresB~t rJn<J"t fro," I;,b,,~ areas be !rc'lJcccy <br />~nd lysis. The magni t"Jd<:> of the I nte~..-edl ~te Reglo",' I Flood web deTer- <br />"l'rec by ~tatl s.ti<;.a I ao,ll'ls Is of rainfa II frequency. Rai nfa II va I jElS <br />;.rom N(),~.A \\'C',)Th.er S",.vi v, "T ech~ I c~ I Paper "0. 4C" for 100, 2~, .and <br />10 y~"lr frocuencle5 werO "sod ~o co-npute t loodS O' co~re5p"rdi r.g <br />f~e'~uency . <br /> <br />13 <br /> <br />,., <br />