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. FLOOD OF APRIL-MAY 1942 The flood of April-May 1942 on the South Platte River and tributary streams was the result of snowmelt runoff being augmented by heavy precipitation during the last half of April and the first part of May. The mountain area above Chatfield Dam produced most of the volume that passed the Denver gage and, although peak values during this flood were not high in comparison to other floods, the volume of runoff was excessive, with a 30-day runoff of 265,000 acre-feet flowing past the Denver gage and a 60-day runoff of 395,000 acre-feet. Four separate flood crests occurred at the Denver gage with the maximum peak of 10,200 cubic feet per second recorded on 25 April. Peak flows in excess of 8,500 cubic feet per second were, however, recorded on 19, 23 and 30 April. The minimum flow at Denver during the 24-day period from 19 April to 13 May was about 4,500 cubic feet per second. FLOOD OF 16-17 JUNE 1965 The flood of June 1965 is without question the most disastrous flood event in terms of dollar damage that has ever occurred in the South Platte basin. In the Denver area the flood was the result of runoff from heavy intense rainfall occurring on the evening of 16 June, centered over the high plains area of the Plum Creek and Cherry Creek basins. Runoff from the Cherry Creek area was con- trolled by Cherry Creek Dam as the entire hydrograph from that area (estimated peak 58,000 cubic feet per second) was stored in the Cherry Creek reservoir with zero release. Runoff from the uncontrolled Plum Creek area, however, produced a major disaster not only along the tributary itself, but also along the South Platte River through Denver, beginning at the point where Plum 24 .