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I ~,TROO~CT I ON Technica I a~sistarlCe to FOdera I, State, and 10;;3 I a'lenc ies in the interpretation and use of the information contained in this roport...ill,uponrequest, beprovidod by theiftaha District, Corps of E~ingers. However, zoning or other regulation of flood plain use isa local responsibility. To assist in tho effective u5(l of the flOOd plain, the U. S. Army Corps ot Engineers' pamphlet, "Guidelines fOr Reducing Flood Damages," is available l1pOn request. Al50ayail- able for use, in consldsoring mathods for preventing flood d"mageto buildlngsandotherphysicalproporty, Is the publication "Introduction to FlOOd Proofing" prep(lred by the University of Chicago, Center for Urban Studies, with the financial assistance of tma Corps of Engineers <lndthoTennesseeValleyAuthorlty. The Information given in this report does not Imply any Federal interest or <luthorlty to zOne or regulate use of the flood plains, nor should It be construed as obligating the Government to investigate, construct or maintain (Iny facility discussed here In. The flood profiles (Ind flooded area data presented are based On existing stre~m and valley co~ditions at the tl~e the roport wa~ prepared, ~nd arereason<lble, rather than precise, indications of probable occur- renc",s. Theusetowhlchfloodplaininformlltionwill bllpyt is the responsibility of Io;;alauthorities. TheCl1l<:lhaOistrictof the Ccrps of E~gln~ars will, upon request, p~oyida ~sslstan~1l in the Int~rpre- t~t;on of these data. This report defines the flood characteristics of Left. Hand Creek located in Boulder::O\Jnty, Colorado. It is the flrst of throe flood plain information volumes cayerlng streams in Boulder Coonty ano was prepared in response to an apollcationmade by the Dan~er Regional Counci I of Go~er~ments through the COlorado "~ter Con- servationBoard. The purpose of this report Istoidentifytheflood hazard <lreas In order to assist local officials and others In making prudent use of thostraamvalloy. The basin and stream characteristics, flood histories and probable effects of floods greater than any of record are presented sequentiallyinthlsreport. Two potential floods, Intermediate Regional and Standard Project, were used to represent those greater than any of record but which may occur in the futyre. Thesetwo floods are fully defined in the Glossary and shoyld be given appropri- ate conslderatio~ in deyaloping controls and planning for flood plaIn constryctlon. The flood hazard areas defined by the two potential floods ara Shown on tM plates at the end of thisroport. The flooded area maps Show the cpproxlmateareas that would be Inundated,theproflles ,;how the elevations of the water surf<lc!lacross thevalleyporpo n- dlCl1l~r To the stre~m, ~nd the cros~ sec~[ons Indic~tc the dcpth~ of flooding across the flood plain. These aata provide the bases for planning and application of control measures by local offlci<lls. This report does not prooose Improvements to control floods. It is provided to local otfici<lls for theirguidanca in plan- Ilin!) the "5" and regulation of th<,floOJ plaillilnd as public infor - matlon regarding the flood hazards. Ayoidance of flood problems ,"i~llt t;." d':;;:;OOP' is.,,,J tll(<>,,~h l<>n;.~ dnJ ~"bdi..,.:s:on r"9yi<lt:'m~, con- struction of flood protection works, or a combination 01 the two ilPprooches. ii