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<br />which the Ora inage b"s i n is loca.ed, excl~d i ng cxt~e"'ely rarc COlO- <br />bi nat ions. Poak dlschar~e5 lor 10ase floods are g<)ne~all y about 40 <br />po rcu r. t to 60 percent of the PrOP<l b I e ~f"lX i ",um Flood s / or the 5",oe <br />:"s i n,. S~cn f 10005. as usOd bv tr,e :::O~ps 01 L.oS i noors. are intend,," <br />as ~racticable exnressions of thQ degree 01 prOTection tn<lt ,hould <br />besoughT in t_1ed<)-sign 01 /lcodcontrDI...orks,the/<lilureO'..hich <br />~i~ht be disastrous. <br /> <br />AUT~ORITY. ACKNOWLEDGEMENTS AND INTERPRETATIO~ OF OATA <br /> <br />This reporf has boon prepared in accordance with the <br />authority granted by S~ctjon 206 of the Flood Control ^ct 0/ 1960 <br />I PUb I ic Law 86-64~) as amended. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Underclearance <br />The under side 0/ a bridOe or othor structure over or <br />across a river. stream or water COurse thaT limits the opening through <br />wniCh water flows. This is referred toa, "low steel" in sonerogions. <br />For culvorts or arched structures - through which water flows _ the <br />cro~'n or top of arch Is ca lied "vnderc learar"lCe" in thi s publ ication. <br /> <br />Assist3nce and cooper~rion of toe Denver Regional Council <br />0/ Govornments and the U.5. weather Bureau in s~pplylng use/ul data <br />are appreciated. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />This roport presents the local flood situation along <br />portions of boulder and South Boulder Creeks near Boulder, Colorado. <br />The Omaha District 0/ the Corps of [nglneers wi I I provide inter- <br />pretationand Ilmitedtochnical assistance lnapplicatlonofdota <br />presented hereIn. <br /> <br />" <br /> <br />1O <br />