|
<br />to 3.5 inches, occurring in about 2 hours, An estimated peai, discharge if 8,700 cubic feet per second
<br />discharged out ot Bayou Gulch, The discharge on Cherry Creek, 3 miles north of Parker, was
<br />estimated to be 17,000 cubic feet per second, Although no damages were experienced in Denv<Jr, this
<br />was considered a major flood for the upstream part of the basin,
<br />
<br />Flood of August 1933, The storm of 2 and 3 August 1933 occurred OVElr a 175 square mile area
<br />upstream from Franktown, Unofficial rainfall amounts varied fl'Om 3 to 9 inches and occurred over a
<br />9-hour period between 6 p,m, on 2 August and 3 a,m, on 3 August The most intense activity of the
<br />storm occurred between 9 p,m, and 10 p,m, Waters, in the then existing Castlewood Darn and
<br />Reservoir, reached the spillway crest at about 11 p,m, The Inflow was estimated at 35,000 cubic feet
<br />per second, Water overtopped the crest of the darn and the structure failed at about midnight. The
<br />sudden release of water caused a flood wave to mOVE) down the valley, The peak discharge is
<br />estimated to have ranged from 126,000 cubic feet per second downstream from the dam to about
<br />16,500 cubic feet per second near the South Platte River, The Cherry Creek Flood Commission
<br />estimated the damages to be about $1,000,000; approximately $200,000 of this total occurrEJd
<br />upstream from Denver. This flood caused addttional economic effects in the Cherry Creek basin, Loss
<br />of the dam cut off water supplies to about 3,000 acres of land, The basin suffered a severe recElssion
<br />and many families moved from the area,
<br />
<br />Flood of August 1945, A large storm mass moved into southeastern Colorado on 5 Augusl1945
<br />and extended over the Cherry Creek basin, Unofficial rainfall amounts varied from 2 to 5 inches,
<br />Severe flooding occurred along Cherry Creek in the Franktown ' Parker area, The gaging station at
<br />Melvin recorded a peak discharge of 10,700 cubic feet per second, Total damages were estimated
<br />to be $200,000,
<br />
<br />Flood of June 1965, On 16 June 1965, a major storm centered over the Plum Creek and Cherry
<br />Creek basins, Rainfall amounts, reported by unofficial SOUI'ces, ranged up to 10 inches, Most of the
<br />rainfall occurred within a 3-hour period, Peak discharges along Cherry Creek were 1,000 cubic feet
<br />per second upstream from Franktown, 39,900 cubic feet per second near Melvin, and 58,000 cubic
<br />feet per second at Cherry Creek dam. An estimated peak flow of 14,100 cubic feet per second
<br />discharged from Piney Creek, a right-bank tributary of Cherry Creek, During the evening and night of
<br />16 June, the Cherry Creek reservoir impounded a flood which had a volume of 16,000 acre-feet Of
<br />the 18 small dams constructed by the Soil Conservation Service in the upper Cherry Creek basin
<br />between Franktown and Parker, 3 were filled, Two of these were subsequently overtopped and
<br />sustained erosion damage, The remaining 15 structures were outside of the area of high intensity
<br />rainfall and received only moderate runoff, The heavy runoff caused major flooding along the main
<br />stem of Cherry Creek from the vicinity of Franktown to the Cherry Creek reservoir, About 2,720 acres
<br />were flooded, Most of the bridges ac'oss Cherry Creek were either damaged or destroyed, one life
<br />was lost during the flood on Cherry Creek, Flood damages tol:ale(1 $1,306,000,
<br />
<br />4,1.6 SAND CREEK BASIN
<br />
<br />Flood History, Available data indicate that major flood events in the Sand Creek basin are caused
<br />by runoff from intense thunderstorm-type rainfall. Nine major floods have occurred in the Sand and
<br />Toll Gate Creek basins since 1896, No flood discharges are available for floods in 1896, 1912, 1917,
<br />
<br />Colorado Flood
<br />llydrology Manual
<br />
<br />4.8
<br />
<br />DRAFT
<br />
|