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SUPPLEMENT: (3) Regulation of flood plain usea may be difficult to aehieve in II~eBa AU'I'HORlZATION where extenaive eoeroaChmellt has prev10ualy occurred. This report is one of a series prepared in reaponse to an app11cat1011 Although the choice a~ong alternatives 1, often complex, it ia obvious -oytha InterMCountyRegioMl Planning C0IIlllI1n1onof Denver, Colorado, for that adequate and continuing public information On flooding potentials and information on the flood potentiale and flood hazard aress of the atreama flood hazard areaa can be a potent force for prevention of flood damages, in the metropolitan region of Denver, Colorado. '!he City of Aurora, Thi6 6ervea to caution the uninformed againat encroachment into '-'IlrecogM Colorado joined in the application for atudies on Sand aod TOll Gate Creeka. nized haZllrd sresa. However, informstion alone may be 8 fickle g~rdian The Colorado WaterConservatlonBoard, in its capae1tyas atatecoordinating of cOllllllunity veltere Ulllesa eoo:munity plallllers adopt measures to prevent agency, has endorsed these applicationa. unwise encroachment into flood hazard llreaa. However, without community This report VAS prepared under the authority of Section 206 of the 1960 Flood Control Act (Public Le" 86M645, 14 July 1960), Wllich reads in support, flood prevention measures can be only pertially effective. The pri~ary re8ponaibllity for prudent use of the flood plain rests part as follows: plllinuse,oraacOOlm1ttingtheFeder"lGovernmenttoinvestigllt1ng, "That, in recogo1tion of the incre"sing lIse and development of flood plaina of the rivers of the United Statea and of the need for information on flood hazards to serve aa a g"ide to allch development, and sa a basis for IIvoiding future hazards by reg"latioo of use by states and Municipalities, the Secretary of the Army, through the Chief of Engioeera, Department of the Army, is hereby lI"thori~ed to compile And disseminate information on floods anClt'looddstllages, including identification of area a sLlbJect to inW"ldation by floods of variOU6 magnitudes and freq"enciea, and general criteria for r;("idanco in the use of flood plain orella; and to provide engineering advice to local interests for their "6e in plonn1nr;( to mnel10rate the flood hazards; prOvided, that the necessary a"rveys and studies vill be ~ade and a"cn informationaad adv1cew1l1 beprevided for 6pec1fio l.ocaUtiea only "pon the requeat6 of a State or a responsible looal Governmentsl IIgency and "pon apprevalbytheChiefofEngineers," with the local community, Thua "bile this report i8 published to define the flood hazards, it should not he construed aa inferring sny intent to extend any Federal a"thority over zoning or other regulation of flood planning, de6igning, constTucting, operating or maintaining afiY facilities disc"6SGd, except to the extent that they may he IIuthorized by Congress. TECHNICAL I~FORYATION A more extensive presentation of the flood plain information s~~arized inthh report, including related technicald"t9, is available in "Volume II, FloodPlain InfOI'lfllltionReport for the Metropolitsn Region of Denver, Colorado, Sand,TollGatcnndLowerCherryCreel<a." A limLted nurnber of copies of th1a f~l report are available for distribution, " "