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ItlF-:ODIJCTION Technical assistance to federal, State, and local agencies In the Interpretation and use of the Intormation contained In this report ~ill, upon request, be provided by the Omaha District, Corps of Engineers. However, loning or other regulation of flood plain use isa local responsibility. To assist in the effective use of the floodplaln,theU. S. Army Carps of Engineers' pamphlet, "Guideli nes for Re<:Iucing Flood Damages," is available upon request. Alsaavail- able/oruse, In considering methods tor preventing fiood damage to buildings and other physical property, is tne publication "Introduction to flood Proofing" prepared by the University ot Chicago, Center for Urban Studies, with the linancial assistance of the Corps of Engineers and the Tennessee Valley Authority. The Intormatlon given In this report does not imply any Federal Interest or authority to zone or regulateuseot the tlood plains, nor Should it be construed as obligating the Government to Investigate, construct or maintain any taciilty discussed herein. The flood profiles and tlooded area data presented are based on existing stream and valley conditions at the time the report was preparod, and <lrereJsonablc, rather than precise, indications of probable occur- rences. Tha \Jse to which flood pJaln intormatlonwlll be put is the responslbJlltyof local authorities. The Omaha District of the Corps ofEnglneerswlil,uponrequast,provideasslsfdnCe in the inte rpre- tatlo~ o~ tho~e dJt~. This report defines the fiOOd ch~racteristlcs of Left- HandCreeklocdted In80ulderCounty, Colorado. It isthefirstot three flOOd plain Information volumes covering streams in Boulder Counfy and was preparod In response to an application made by the Denver Regional Council of Governments through the Colorado Water Con- servation Board. The purpose of this re~orT Is TO identify the flood halard areas in order to assist local officials and others In making prudentuseofthestre<lmv<llley. The basin and stre<lm characteristics, flood histories and probable effects of floods greater than any of record are presented sequentially In this report. Two potential floods, Intermediate Regional and Standard Project, were used to represent those greater than any of record but which may occur in the future. Thesetwo floods are fully defined In tneGlossary and shOuld beglvenappropri- ate consideration in deveioplng controls and planning for flood plain construction. The flood hazard areas defined by the t~o potential floods are shown on the plates at the end of this report. The flooded area maps show the approximafe areas that would be inundated, the prOfiles show thealevations of the water surface across thevallfiY perpe n- dicular to the STream, ~nd the CrOSS ~oCTion.. Indi~te the depths of flooding across the flood plain. These daTa provide the bases for pla~ning and appliCation of control meaSureS by local officials. This report does not prooose improvoments to control floods. It isprovldadto local officials for their g\Jldanca inplen- nlng tho use and regulation of the flood plain and as public Infor- mation regarding the flood halards. Avoidance of flood problems might be accomplished through zoning i1nd subdiviSion regulation s,con- struction ot flood protection works, or a combination of the two approachos. Ii