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I , The total community. Designated floadways may be reserved by esta-. blishlngencrollehment lines thlltclearly defIne the floodwayzone. The utilization of tlood plain lands adjacent to the floodwllY Is limltedonlybythedegreeottlood rIsk deemed 1I110wllble (::ldeter- mlnatlon of local government) and the rt'lquimrmnts of the cIty's normal zoning crIterIa for the are". By general definItion, a tloodwllY Is that section Of the flood plaIn area provIded to convey a design frequency flood so that remaIning sectIons 01 the area can be used more economically. The"deslgnflood"oftenselectedlnconnectlonwlthfloodwaydeter- mlnatlonslsthe IOO_yearfrequencylntermEldlateRegionlll flood. In terms of maintaining a reasonable balance between the advantages of reducing potential flood losses and The dIsadvantages of overly res- trlctlng land use, this flood's heights and areal limIts are consld- eredmostpractlclll for use In gaining the goals sought through se- lectlve zonIng. To maximIze the ::lrea available for eoonomlc devel- oPment, e floodway less wide than that requl~d for the unconfined flood can be designed to convey floodflOW5Wlth an allowllble rIse of not more than I foot above the unconfIned flood's water sur/lice elevation. In such event, davelopments in the fringe area would need to be raIsed on flll,orbeotherwlseprotectedby floodproof- lng, to the design water surface elevatIon of the floodw~y. Cities and countIes within the St~te of Colorado are authorized to enact 1Ind enforce land use controls. Assistance ::lnd guidance on the enactment of resolutIons, ordInances, and regu- lations 1tlat relate to flood plaIn management Is available from the Color~do Water Conservation Board. These regulations provide an effective me",ns ot controlled cons truc- tion an~ preserving floodways In presently undeveloped flood plaIn "'reas. Building Codes In addition to the more conventlon::ll construction stan- dards set forth, t:<ui Idlng codes Should specify proviSions that (lS- sure the structural integrity of buIldings during flood periods. Requiremants to reduce flood damages include elevation control, considerations of strength and deterioration susceptIbility in volv- Ingmaterlals, proper anchorage, andfloodprootingcrlterla. rloodprooflng Floodprooflng measures can be effectIvely applied to hoth exIstIng and proposed structures in relatlvAly low-rl~k hazard areas. These may Include land fillIng 1Indelevation of structures, slteadjustmants,andstructurill design changes that reduce dilrna ge vulnerability. Health Regulations These regulatIons can serve to control the use of flood plaIns forwastedlspos::l1 and the construction of water and sewage treatment facilities that may createhe::llth problems during floods. SubdIvisIon Ra~ulatlons Used by local go~rnments to specify the manner In whIch landrnayhedlvlded,subdlvlslonregulatlonsmayprescrlbe thewidthofstreets,curbandgutterrequlrements,lotslzes,ele- vat Ions of land to avol c! flooding, sIze ot floodways, and other re~ qulrements ~ffectlng the health, welfe~ ~nd ~~fety of the community. ForocastlnQ dnd EvacuatIon Accurate, timely forecasting of floods and critical streamstages,coupledwlthtemporaryevaCU(ltionandctheremorgen- cy actions, can often save lives In addition to reducing property k'sses. In the development of locl:'\! corrtnJnity pll:'\nning, provisions Should be mado for alerting area residents and coordinating opera. tlons of cl ty-co~nty pub lie 5erv i ce agenc IC5 throughout the f lo.od flgh-ting, evacuatIon, and rescoo activities which maybe require d during a flood emergency. Devlllopme.ntPollcies '~h i I.. al I rft~u Illtory controls a~e val Ul:'\b 18 tools ; n 27 ze