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<br />POTENTIAL FLOODS <br /> <br /> <br />This section discusses the Intermediate Regional and <br />Standard ProJect floods 3"d tholroffects. ThelntermodiatsRegional <br />flood represents 3 flOOd with an average frequency of occurrence 01 <br />a bou t once I n I 00 y&a r 5 and i s I ncr 8d,., I "9 I Y be I ng accepted by t~la <br />public as a minimum limit for application of I oe" I regulatIon,.,. The <br />Standard Project Flood Isof gre3ter magnitude and represents a <br />reasonable upper 11"11' of expected fl=dlng. However, It Is oot the <br />largest flood1"hat Is possible. 11" Is emphasized here that floods <br />..hichllresrnallerthantheln"termedlateReglonal flood are much rnore <br />likely to occur. Although these lesser floods Inundate s"",ller areas <br />they wo~ld also cause damage, hardship and Inconvenience. <br /> <br />Highway 8 <br />Above: <br />Below: <br /> <br />bridge over Mount Veroon Croek at Morrison. <br />Rocentphoto. <br />Shortly after flood of September 1938. <br /> <br />Intermediate Req iona I Flood <br />The Intermediate Ragional Flood d;scharge for ElearCreok <br />atMorrison..asdeveloped fro-na statistical an<llyslsof the strOll m <br />gaga records at ~orrlson and on three other typical Front Ranqe <br />streams. The method used c~blnes the effects on peak flows 01 run_ <br />off frOll "thunderstorms and snowmelt. The Inter."ed;ate Regional FlOOd <br />diSCharge for Mount Vernon Creek at ~~rr;son waS obtained ~y an <br />a!lalysls of slm; lar foothills trib<Jtarles. Table I, page 17, shows <br />InTermediate Regional Flood dl$Ch~rges tor bOTh Rear and Mount Vernon <br />Creeks. <br /> <br /> <br />St~ndard ProJoct Flood <br />The Standard Project Flood, ",., presented In this reoort, <br />represents a practical upper Ilmltof flooding. Stor",sthat..ould <br />oreduce this flood are uncommon and have not been recorded in most <br />dralMlgebasins. It Is difficult to assign fraquenclesof occurrence <br />for these floods ..Ith any reasonable degreo of accuracy. However. <br />floods of this size do occur. During 1965, floods i"theO..nver <br />metropolltan"reilapproachad StJndard ProJect FloOd maqnltudean <br /> <br />" <br /> <br />'6 <br />