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<br />d. Runoff forecast. Table 21 gives forecasts of April- <br />September runoff _de by the Nati<:>nal Weather Service at three <br />selected locations in the South Platte River basin. These <br />forecasts are based primarily on lllountain snow measurements. <br />Similar forecasts were made by the Soil Conservation Service <br />and the Corps of Engineers. <br /> <br />Table 21 <br />SOUTH PLATTE RIVER BASIN <br />FORECASTS OF APRIL-SEPTEMBER 1973 RUNOFF, VOWME <br />(in percent Of average) <br /> <br />Forecast South Platte River Bear Creek Clear Creek <br />Date at South Platte at Morrison at Golden <br />1 Feb 120 135 112 <br />1 Mar 106 122 106 <br />1 Apr 98 126 97 <br />1 May 135 170 12'7 <br />Average Volume, <br />Acre-Feet 155,000 23,000 120,000 <br /> <br />e. Reservoir reKUlation. Plate 27 illustrates the April <br />through July 1973 Cherry Creek Reservoir operation. Table 22 <br />summarizes the reservoir regulation orders issued for that <br />project. These orders were iSSU<ld by the Reservoir Regulation <br />Section, Hydrologic Engineering Eranch, Engineering Division, <br />Omaha District, Corps of EngineeI's. These were the only regu- <br />lation orders issued for that pr<:lject during 1973. Runoff in <br />March and April caused the pool 1:.0 rise into the flood zone on <br />19 April. Releases were initiat<ld on 30 April to evacuate the <br />accumulated floOd-<:ontrol storag<l volume of 1,320 a,cre-feet. <br />With the pool level still in the flood zone, releases were <br />discontinued on 6 May, because h<lavy runoff from ra.in occurred <br />in the area and caused flood discharges on the South Platte <br />River. As a result of this runOff and of subsequent lesser <br />rainstorm runoff, the Cherry Creek pool rose to a record level <br />of elevation 5565.8 feet m.s.l. <:>n 4 June. Twenty..,one percent <br />of the flood pool, or 17,200 acre-feet of '79,960 acre-feet, <br />was occupied. <br /> <br />f. Cherry Creek Reservoir t<eleases were again initiated <br />on 4 June, gradually reaching a !leak of 375 cubic feet per <br />second on 8 June. Releases were temporarily reduced during <br />14 June to 18 June when additioIllil rain and storm runoff <br />occurred on the South Platte RiVer. Cherry Creek Reservoir <br /> <br />44 <br />