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! couldmini""zelcssof 111eandm::Jvablepruperty in thB Bventof a major flood. Suchanllrruogernentwouldroquirothet local rlvor and rei efa I I reports be COl'1mun rcated p ;ompt I 'f by res~ons I b Ie loce I officials to tn.. Weather Service ForecaST OHlce for evaluatloo Md analysis. Ifav<lllllble, this data and anal',slswould be used by to!! ~'eather Service to r>Ore accurately forewarn OOrrml,Jn Ity represtln- tativ85 of potential storm and flood conditions. Ft!TUREFLOODS FlOOd Fighting and Emer~ency Evacuation Plans Provisions lor alerting area r\,sidents and coordinating county service agencies in time of emergency are presently document- ed in the "Colorado Springs/EI Paso County Evaluil-tion-Operatlon PI an (January 1967)," Theplan'soonceptofoperatToncallstordissemi- natlonof"heavyrainwarnlngs" during the earliest stages of a flood threat. Subsequent flood fTghtlng, evacuation, and rescue activitlesarecoordina-tedonacountywldebaslsbytheCivil()()- fense Control Center which can request State or Federal assTstance should the county resources prove inadequate. Thlssectioo of the re;>ortdiscusses the Standard Project Flood and the Intermediate Regional Flood on Co~tonwood Cree~ in the viclnitv of Coiorado Springs, and some of the hazardS of great floods. T~e Standard ProJec':" flood represents the rllasonable upper i imits of e>qected flooclng. floods of Intermediate Regional Flood size my be ox~eGted tQ OGcur more olten, but they wi II not be asseverells the infrequent Standard ProJect Flood. Large floodS have occurred in the past on Das;ns of sifflilarcllmate <'lnd physical characreristic5. Conditionscausingtte floods could be repeated in the CQttonwood Creek basin, the refQre , to determine the floodlrg pote~tl a I it was receSS1jry to cons i der storms <'lnO lloods that ~avc Occ'Jr~()c I ~ regions of II ke -:-op<<;raphy, watershed ccver, and P_"vsi- cal characteristics. Discussion of tuture tlOO05 In this repod is Ilmitedtothosethathaveccendesignatedasthelnt€rrncclateRc- gional a~d Stancard Project Floods. The estimates of InterMdiaTe Regio~al ano Standard ?roject FloodS as p~esentec In thi, report are besoed o~ f-Jt-Jre c<:'ff1d i tl onS d5 do~er"i ned ,v I an~ use "'''J5 t~r" i shed by EI Paso Gcunty, Color~do. I ctorr<Jd i,,-t'2...R1og i em" I Fiood The I ~t"r"",cl Gte '<eg,ona I Flood is def I r~)d as l"V- -ng a~ _~verage 1,-~Y"~~~Y of OCCJrre~ce of Qnco In 100 years at ~ d..s I<J..-.ated locati on. J IthcJqh i t ",~v occur in dnV year and pos51~ Iy even i r, s~cce5S i ve vaG rs. The 11t-er...,d i ate ""9 lonG I Flood ~epre5()rts ,j 'I1i:jor flood alt~(),_IC)'1 i~ Is les5_ ~ever.e fr.,)l thfl St"nd~rd Prcjen f'iooa. Tr_e~e ~~e ~_O stredm '.i~nirq stction& in H.e vklr_ity 0" ""a st~d'i Qrea thaT ~epreSB~-r rJn<J"f fro'O I;,b,,~ areas be !rC'lJcncy and lysis. The magni t"Jd<:> of the I nter,,-edi ~te Regl""" I Flood web de~er- "l'rec by ~1ati s-tic-a I 80"I,/s is ot rainld II trequency. Rai nla II va I jElS ;.rom N(),~.A \\'C',)Th-er S",-vi ce "T echn I C~ I Paper 'oJo. 4C" IQr 100, 2~, -and 10 y~"lr frecuoncic5 wen) "sed ~o cO'f1~:'"te flOOdS O' co~re5pordir.g f~e'~uency . i3 ,.,