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<br />information on the operation of Chatfield Dam. For that reason, <br />the South Platte River does not match the regional data of the <br />USGS. <br /> <br />The . flood frequency-discharges used in the two independent <br />re-analyses of the South Platte River were taken from the May 1983 <br />hydrologic study developed by Merrick and Company under ~ontract to <br />the UDL"CD (Reference 1). Analyses were carried out to establish <br />the peak elevation-frequency relationships for each flood source <br />studied by detailed methods. Peak-discharge area relationships for <br />the streams studied by detailed methods within Littleton except for <br />SJCD 6100 are shown in Table 1. <br /> <br />Table 1. SUMMARY OF DISCHARGES <br /> <br />'-"'''-~~..' <br />'~~-"""''' . <br /> <br />Flooding Source <br />and Location . <br /> <br />Drainage Area Peak Discharges (cfs) <br />(square miles) .10-Year . 50-Year . 100-Year 500-Year <br /> <br />South Platte River <br />Above Big Dry Creek <br />Just upstream of <br />the confluence" of <br />Dutch Creek, near <br />Fairway Lane <br /> <br />24.7* . <br /> <br />3,300 6,900 <br /> <br />~_1 <br /> <br />1,300 '2,200 <br /> <br />Big Dry Creek <br />At South Platte <br />River <br /> <br />19.6 <br /> <br />3,400 6,800 <br /> <br />Slaughterhouse Gulch <br />At South Platte River <br /> <br />2.0 <br /> <br />1,400 <br /> <br />1,700 <br /> <br />South Tributary to <br />Slaughterhouse Gulch <br />At Slaughterhouse Gulch <br /> <br />0.37 <br /> <br />438 <br /> <br />. 520 <br /> <br />Little's Creek <br />At South Platte aiver <br /> <br />2.3 <br /> <br />1,800. <br /> <br />2,300 <br /> <br />Lee Gulch <br />At South Platte River <br /> <br />2.5 <br /> <br />1,900 <br /> <br />2,500 <br /> <br />SJCD 6200 <br />At a point upstream of <br />Platte Canyon Road <br /> <br />__1 <br /> <br />'. __1 <br /> <br />__1 <br /> <br />1Data Not Available <br />"~Drainage Area Reflects Only Contributing Area Below <br /> <br />8,900 <br /> <br />15,000' <br /> <br />2,700, <br /> <br />4,000' <br /> <br />8,900 <br /> <br />16,020 <br /> <br />REVISED DATA <br /> <br />2,000 <br /> <br />2,900 <br /> <br />550 <br /> <br />720 ' <br /> <br />2,800 <br /> <br />4,200 <br /> <br />2,900 <br /> <br />4,500 <br /> <br />2,440 <br /> <br />__1 <br /> <br />Chatfie1~,]~~P~~DglO <br />c,.: h" ~"~ ' t <br />P,. ,< ~'-l ' <br />~j'di!.,u \tl' ~". <br /> <br />'!','W'f'~, ~""AJr LOMR <br />b.i{ ,?~ ~It ~, If" m <br />~\;g",~ [;<<~"'~ <br /> <br />11 <br /> <br />DATED JUN 2 9 200~ <br />