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<br />", <br /> <br />. <br /> <br />~ <br /> <br />exceeding 2,000 cubic feet per second per square mile. The peak dis- <br />charge in the vicinity of Morrison was 9,200 c.f.s. which reduced to <br />2,800 c.f.s. at the mouth. The flood took six lives and caused property <br />damages totaling $648,000 at 1938 price levels. <br /> <br />c. Flood of 9 May 1957. The flood of 9 May 1957 resulted from a <br />series of storms over the lower Bear Creek basin. The greatest concen- <br />tration of rainfall was 2 inches over a 6 hour period. Discharges at <br />the mouth during the period 9 May to 1 June ranged from 600 to 1,200 <br />cubic feet per second. Although these discharges stayed within banks <br />at Sheridan urban area, the sustained flows caused severe bank erosion <br />and endangered many homes near the stream. Sandbagging operations, super- <br />vised by the Corps of Engineers, prevented considerable erosion. The <br />flood also caused considerable damage to a bridge under construction at <br />Wadsworth Avenue. The urban damages from this flood were estimated to <br />total $20,000. <br /> <br />d. Flood of 23-26 July 1965. On 23 and 24 July 1965, heavy rains <br />over headwaters areas of Bear Creek caused minor flooding throughout <br />the length of the stream. At Evergreen, the stream ran bankfull, <br />threatening the commercial sector of the town. Private residential <br />property in the vicinity of Evergreen suffered damage principally to <br />the landscaped grounds and private bridges. Nearer the mouth, in <br />metropolitan Denver, 25 families were evacuated, 15 basements and a <br />trailer court were flooded, and several bridges suffered minor damage. <br />The peak discharges recorded were 1,030 cubic feet per second at <br />Morrison and 2,900 cubic feet per second at Sheridan. <br /> <br />13 . STANDARD PROJECT FLOOD <br /> <br />The standard project flood for Bear Creek was developed by <br />procedures described in ~ppendix III. The standard project flood <br />hydrograph has a peak discharge of 73,000 cubic feet per second in <br />5-3/4 hours, after beginning of runoff, and a total volume of 25,000 <br />acre-feet within 14 hours. <br /> <br />14. PROBABLE MAXIMUM FLOOD <br /> <br />The basis of derivation of the probable maximum flood is presented <br />in appendix III. This flood would have a peak discharge of 260,000 <br />cubic feet per second in 6-3/4 hours after the beginning of runoff, and <br />a total volume of 109,000 acre-feet within 15 hours. <br /> <br />IV. FLOOD DAMAGES <br /> <br />15. EXTENT AND CHARACTER OF FLOODED AREAS <br /> <br />a. General. The flood plains of the Bear Creek valley reflect <br />the distinctive characteristics of the topography through which the <br />stream passes, In the mountainous portions, which comprise 90 percent <br />of the basin, the narrow valleys are confined by sharply rising canyon <br />terrain. Downstream ,'rom Morrison, the valley broadens into the plains <br />area of metropolitan Denver. <br /> <br />37 <br />