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<br />gaging station at Melvin recorded ai peak discharge of 10,700 cfs. <br />Total damages were estimated at $200\000. <br /> <br />; <br /> <br />, , <br />A severe s,torm centered over the Baiou Gulch basin, a tributary to <br />Cherry Creek, during the afternoop of July 28, 1922. Heavy <br />rainfall was reported in the area bO\.lnded by lines 3 miles north of <br />Parker, approximately 4 miles west of Cherry Creek, 1 mile south of <br />Franktown, and by the Douglas County limits on the east. <br />Unofficial rainfall amounts varied from 1 to 3.5 inches and <br />occurred in approximately 2 hours. An estimatred peak discharge of <br />B,700 cfs flowed out of Bayou Gullch. The discharge on Cherry <br />Creek, 3 miles north of Parker, w~s estimated to be 17,000 cfs. <br />Althollgh no damage occurred in Denv~r, this was considered a major <br />flood for the upstream part of the basin. <br /> <br />Peak discharges along Cherry Creek' were 1,000 cfs upstream from <br />Franktown; 39,900 cfs near Melvin; 'and 58,000 cfs at Cherry Creek <br />Dam. An estimated peak discharge df 14,100 cf s flowed from Piney <br />Creek, a right-bank tributary of Ch~rry Creek. During the evening <br />and night of June 16, the Cherry Cr~ek reservoir impounded a flood <br />that had a volume of 16 ,000 acre-fe~t. Three of the 18 small dams <br />constructed by, the SCS in the up~er Cherry Creek basin between <br />Franktown and Parker were filled. 'Two of these were subsequently <br />overtopped and sustained eros,ion da",age. The remaining structures <br />were outside the area of high-inten~ity rainfall and received only <br />moderate runoff. The heavy runoff caused major flooding along the <br />main stem of Cherry Creek from the vicinity of Franktown to the <br />Cherry Creek reservoir. Approxima~ely 2,720 acreas were flooded. <br />Most of the bridges across Cherry! Creek were either damaged or <br />destroyed. One life was lost during the flood on Cherry Creek. <br />Flood damages totaled approximately 1$1. 3 mi 11 ion. <br /> <br />No floods of consequence have occurred since 1965. <br /> <br />2.4 Flood Protection Measures <br /> <br />The possibility of future flood dal'1age in the upper Cherry Creek <br />areas has been somewhat reduced byi the construction of 32 flood- <br />water-retarding structures. The iSCS compLeted construction of <br />these structures in 1965 .s part o~ an overall plan (Reference 4). <br />These structures were designed for' an agricultural community with <br />design floods having a 25~year recutrence interval. <br /> <br />3.0 ENGINEERING METHODS <br /> <br />I <br />I <br />For the flooding sources studied in detail in the community, standard <br />hydrologic and hydraulic study methods ~ere used to determine the flood <br />hazard data required for this study. Flbod events of a magnitude which <br />are expected to be equaled or exceeded! once on the average during any <br />10-, 50-, 100-, or 500-year period (recurrence interval) have been <br />selected as having special significanc~ for floodplain management and <br />for flood insurance rates. These events!, commonly termed the 10-, 50-, <br />100-, and 50 a-year floods, have a 10-,[2-, 1- and 0.2-percent chance, <br /> <br />6 <br />