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<br />: "I~ :i1~ lCelS used :0 calcCJiate the PMF was 12,8 h, which agrees with the reported floodwave <br />"3\'8 :,e18S ThE \'3Iue 0' C was assumed to be 1,3, This was based on previous flood studies <br />0' tn" arca The pattern of lhe 1965 storm built on at least 4 days of rainfall, which left the ground <br />falr'v saturated Assuming similar conditions for this study, no initial loss and a constant loss rate <br />of 0,2 In/r! were used, This IS consistent with previous PMF studies for this area, <br /> <br />The PMP for this study was developed from the criteria in HMR 55 [2], which covers the region <br />from the 103d meridian to the Continental Divide, The PMP for this basin totaled 20,11 inches in <br />72 h Tnls includes a baSin averaged 4-h maximum of 10 in, which compares favorably with a <br />pOint ralnfali of 14 Inches In 4 h recorded in a nearby basin [42J, Plate 23 shows a comparison <br />of the PMF hydrograph peak and the historic flood peak for this b.asin, <br /> <br />800 ~ <br /> <br />7130 <br /> <br />PMF PEAK - 730100 CFS <br />72 HOUR VOLUME -871274 ACRE FEET <br /> <br />600 <br /> <br />" <br /><,- <br />u <br /> <br />BUREAU OF RECLAMATION <br />PHF COMPARISON STUDY <br />EIJOU ERSIN NERR WIGGINS CO <br />PMP ERSED ON HMR 55 <br />LRG ~ 12.8 HOURS CHERRY CREEK DUH <br /> <br />is) <br />is) <br />is) <br /> <br />500 <br /> <br />hiSTORIC PE!.K = <br />l.66000 CFS", <br /> <br />, <br />El.~ CJr Dt.,j, PE.cv, f <br />I <br />! <br />, <br />I <br />I <br />, <br /> <br />w <br />" <br />~ <br />u <br />co <br />H <br />OJ <br />L- <br />a <br />w <br />>-- <br />G: <br />IX <br /> <br />'" I <br /> <br /> <br />302 r <br /> <br /> <br />\ <br />\ <br /> <br />HISTORIC fLOOD JUNE lB 1965 PEAK - ~66B0e Cf5 <br />RC 5/19/8'1 <br /> <br />i <br />I <br />200 L <br /> <br />I <br />I <br /> <br /> <br />100 <br /> <br />o <br /> <br />o <br /> <br />6 <br /> <br />! 2 1 B 24 313 36 42 48 54 613 <br />TIME FROM BEGINNING OF RRINFRLL (hrs) <br /> <br />84 <br /> <br />66 <br /> <br />72 <br /> <br />78 <br /> <br />Plate 23. - Computed PMF hydrograph and historic flood peak for Bijou Creek near Wiggins, CO. <br /> <br />21. Tributary to Little Pinto Creek near Old lrontown, Utah <br /> <br />In August 1964, several floods were caused by intense thunderstorms and cloudbursts in south- <br />western and central Utah, The storms covered small areas and were apparently short duration- <br />high rainfall events, The entire month of August produced scattered rain throughout this region, <br />The floods were abrupt peaks of short duration in the isolated canyons of southwestern Utah, <br /> <br />- <br /> <br />49 <br /> <br />