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<br />smllller tMm eltt'lflr tt'le IOO-ye<lr or 500-yaar floods are much more <br />comnon. Lerge floods, t'lowever, een t'leppen; this WIlS cleerly demon- <br />streted by thaOenver erell flocdsof 1965,the611lekHIlls, South <br />DtIkotll eree floods of June 1972, end the July 1976 floods In the <br />Big Thompson Cenyon neer Lovelend, ColoredO_ <br /> <br />tiezerds of Lllrqe Floods <br />The extent of dllmege cllused by llny flood depends on the <br />topogrephy of the ereo flocded, depth and durlltlon of flooding, <br />velocity of flow, rate of rise, developmenfs on the flood plain, <br />llmoUn+ of debris In the floodweter, end lee conditions, If lee Is <br />e prob'~ In thet pertlculer llree. ^ 100-yeer flood or e 500- <br />year flood on the South Piette River In thflstudy r8llchwould <br />result In the lnundetlon of end subsequent demeg" to prlmerlly <br />egrlculturel properties end essocleted developments eS welt as <br />public utilities !lnd public rOlldWllYS. Deep floodweter flowing at <br />high velocity end cllrrylng floetlng debris would creet" conditions <br />hllzer<:lous to persons "nd vehicles attempting to cross flooded <br />er_s. In gflnerel, floodwete!" 3 or ITIOre feet deep end flowing et <br />II velocity of 3 or more feet per saoond could ellslly sweep en <br />&Oult person off his feet, thus creetlng definite dllnger of Injury <br />or drowning. Repldly rising end swIftly flowing tloodwllter mllY <br />trll~ ~orsons In homes thet lire ultlmlltely destroyed or In vehicles <br />thetareultlmetelysubmergedorflollted_ Iso'"tlonofllr9<!lsby <br />floodwaterscouldc,.""t..hiltardslntermsof:nodlClll,flre,tH""''' <br />enforcement eMergencies. <br /> <br />o <br />" <br />. <br />" <br />o <br />.8 <br />. . <br />~~ <br />" <br />. , <br />18 <br />. <br />"" <br />. .- <br />.. <br />!!.&~ <br />. , <br />. < <br />e_" <br />.. <br />-> <br /><- <br />~ <br />" <br />8: <br />-+ <br />.. <br /> <br />Study Results <br />The results ot ThIs sTudy lire presented In ttle fOnll of flooded <br />anees, pletes 3 through 22; water surface profiles, plates 23 <br />through 30; elevlltlon-dlscharg9 curves, pllltes 31 throug~ 35; and <br />flood plein reference datil, te~le 9. ~llter SUrfllC8 elevation data <br />....s COOIIputfld through the use of the Corps of Engineers CQIIIIluter <br /> <br />" <br /> <br /><" <br />" " <br />'" ._<n <br />. .' <br />'; '5\ ~,.- <br />C~1n . <br />o-_+- <br />"'''-'''''"- <br /> <br />"" <br />, " <br />. -" <br />. .' <br />';"8 ~,.- <br />8-.!+= <br />_,,"-UJ""- <br /> <br /><" <br />, ' <br />, -" <br />. .' <br />~"5l: ~,.- <br />,15.. . <br />o__+- <br />"'...."'''- <br /> <br />"~ <br />0' <br />" -~ <br />~"O~::f <br />>;8t, <br /><:>--+- <br />-"-"'''- <br /> <br />< <br />< <br />+ <br />, <br />~ <br /> <br />. <br />o <br />" <br />. <br />+ + <br />"01 <br />Q-. <br /> <br />Ie <br />"- . <br />... <br />'.1< <br />" . <br />u z <br /> <br /><:> ~ ~ ~ ~ ro '" ~ ~ ~ ~ ~ ~ ~ '" ~ ~ <br />, , <br />~ ~ ~ ~ ~ ~ ~ ~ N ~ ~ ~ ~ ~ ~ w" '" ~ <br />"'~"""" "'~"'''''''<o<o~~~~o",,,,,,,, <br />'" ~ '" '" '" ~ '" '" '" '" '" '" w '" '" '" '" ~ ~ ~ <br />~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ <br />'" '" '" '" '" '" <I> '" <br />........ .... .... .... ~ ........ <br />::l Cl :J " ::l ~ ::l" <br /> <br />'" ~ ~ " '" ~ ~ "" .., N N '" ~ ~ ~ 0 '" ~ '" ~ <br />. . ... <br />"""'NNW"'''' ~",,,,,,,,"'~O'.ON~ <br />'" "" ~ "" '" '" '" '" '" '" <0 ~ ~ '" ~ ~ ~ w "" <br />~ '" '" '" ~ '" w '" .., <0 W <0 W <0 <0 W ~ ~ ~ ~ <br />~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ <br />'" <I> VI VI '" '" !/l '" <br />';;d" :;d" :; d" ';; d" <br /> <br />" .., '" '" "" "" "" '" NNW '" "" ~ ~ " 0 '" ~ <br />N N . 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