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<br />Colorado Flood Hazard Mitigation Plan - 1999 <br /> <br />boundary to over 70 in the mountains along the Froot <br />Range, The thunderstorm flood season in Colorado is <br />from the middle d July through October, <br /> <br />Big Thompson Flood (1976) - The widely publicized <br />Big Thompson Canyon flood disaster of July 31, 1976, <br />was a resu~ of an intense thunderstorm cell that <br />dropped up to 10 inches d rain in a few hours CNer the <br />basin, <br /> <br />1993 Floods - On May 15-16, 1993, a thunderstorm- <br />induced flood event occurred at Rifle on R~le and GeN- <br />emment creeks. As is usually the case, the highest <br />flows in the shortest period of time occurred when an <br />estimated 125-year flood discharge impacted Rifle, <br />Structures and vehides in harm's way suffered dam- <br />ages in excess of $200,000. <br /> <br />On June 17. 1993, a flash flood occurred on Shooks <br />Run in Colorado Springs, Damages were confined to a <br />mobile home park on the creek's edge with losses esti- <br />mated at $1 Million, <br /> <br />In July 1993, the Town d Otis and the unincorporated <br />area d Cope in Washington County and the City of <br />Yuma in Yuma County experienced a weekend flood <br />event as a resu~ of three consecutive days of thunder- <br />storms, Several homes suffered damages and road- <br />ways were inundated with loss in excess of $650,000. <br />In Otis, a flood control and storm dra;nage project pr<>- <br />tecting the northern half of town worked. <br /> <br />On August 10. 1993, flash floods occurred on several <br />creeks in Delta County. Two roads were washed out <br />and a flood fight was conducted with sandbags on R<>- <br />bideaux Creek near the Department d Corrections <br />Detention Facility. <br /> <br />On August 26-29. 1993, general rainstorms caused <br />flooding in Archuleta and La Plata counties. A subdivi- <br />sion in Archuleta County was threatened and roads <br />damaged as the Rio Blanco overflowed ~s banks south <br /> <br />of pagosa Springs, In Durango, the Fire Department <br />had their emergency operations plan in effect and <br />came very close to evacuating residents d a mobile <br />home park on the Animas River. <br /> <br />1995 Floods - In the spring and early summer of 1995, <br />the lower South Platte, the lower Ar1<ansas and the <br />Roaring Fork Rivers were impacted by signifICant <br />flooding, Most damages were experienced by agricul- <br />tura; landowners, <br /> <br />1997 Floods - On July 24-28. 1997. the City d Fort <br />Collins and most d eastern Coiorado received soaking <br />and/or drenching rains, adding to soil moisture in some <br />locations, As the cold front arrived in the late afternoon <br />of July 27th, strong thunderstorms developed just <br />north and west of Fort Collins, Later that nigh~ steady <br />rains developed along the eastern base of the foothills <br />in Larimer County and corrtinued until about noon on <br />July 28th, Several inches of new rain were reported <br />just west and northwest of Fort Collins totally saturat- <br />ing the ground, producing major flooding in Laporte, <br />and setting the stage for the evening flood event. <br /> <br />On the evening d July 28, 1997. intense rains began <br />around 8:30 p.m, in the foothills west d Fort Collins, <br />Winds from the east and southeast continued to pump <br />moisture into the storm system throughout the eve- <br />ning, The core of the storm was very small but re- <br />mained nearty stationary over the headwaters of <br />Spring Creek, the Fairbrooke Channel. Clearview <br />Channel. the CSU Drainage Basin, and the West Vine <br />Drainage Basin. Rainfall intensity increased and <br />reached a maximum between 8,30 p,m. and 10:00 p, <br />m, before ending abruptly, A subsequent analysis of <br />rainfall conducted by CSU showed a maximum d 10,2 <br />inches of rainfall in less than five hours near the inter- <br />section d Drake Rd, and Overland Trail. <br /> <br />On July 29, 1997, slow-moving thunderstorms dumped <br />large amounts of ra;nfall over the Pawnee Creek Basin <br /> <br />Colorado Flood Facts I <br /> <br />CountleslCltlesfT owns with Flood Prone Areas <br /> <br />268 <br /> <br />250,000 <br /> <br />Population of 100-Year Floodplain <br />Homes In 100-Year Floodplain <br /> <br />85,000 <br /> <br />15,000 <br />$11 Billion <br />$ 4.4 Billion <br /> <br />Total Value of Property In 100-Year Floodplain <br /> <br />CommerclalllndustrlallBuslneases In 100-year Floodplain <br /> <br />Cumulative Flood Losses from Turn of Century to 1999 <br /> <br />Source: CWCS <br /> <br />Figure 2.3 <br /> <br />Chapter 2 - 4 <br /> <br />1I1AXlS::30PM <br /> <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br />