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Last modified
11/23/2009 1:21:38 PM
Creation date
10/4/2006 9:23:56 PM
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Template:
Floodplain Documents
County
Larimer
Community
Fort Collins
Title
An Analysis of Rainfall for the July 28, 1997 Flood in Fort Collins
Date
2/1/1998
Prepared For
State of Colorado
Prepared By
CSU
Floodplain - Doc Type
Flood Documentation Report
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<br />May 12-13, 1982 <br /> <br />3.17 inches in one day, 3.99 inches in two days <br /> <br />Steady, pouring cold rains began on the 12th and were heaviest overnight into the early <br />morning on the 13th. Hourly rainfall rates, however, were not extreme. This was mostly <br />a good soaking spring rain. No infonnation was obtained regarding rainfall totals <br />elsewhere near Fort Collins, but heavy rains were widespread. <br /> <br />March 6-7, 1990 <br /> <br />3.48 inches in one day, 3.83 inches in two days <br /> <br />Evening rain and thunder March 5th turned to wet snow and snow pellets which continued <br />into the evening of March 7th with a total of 17 inches of dense snow reported. The <br />heaviest precipitation fell during the day on March 6. Traffic came to a near standstill, and <br />some roofs bent or collapsed under the load. This storm produced the greatest water <br />content ever observed in Fort Collins in one day in the form of snow. The three-day total <br />for this storm was 4,17 inches. Extremely heavy snowfall amounts in excess of 50 inches <br />were measured in the foothil1s immediately west and northwest of Fort Collins causing <br />considerable tree damage in some areas. Water contents in the foothills were about the <br />same as in Fort Collins, but the snow was less dense at higher elevations. <br /> <br />June 24-25, 1992 2.49 inches in one day, 3.03 inches in two days <br /> <br />A ferocious but brief storm accompanied by heavy rains, frequent lightning, hail and <br />strong winds lasted less then 90 minutes mid afternoon on June 24th. 2.49" was recorded <br />on campus, but precipitation was likely more as some windblown hail bounced out of the <br />gauge. Rainfall was heavier one to three miles northwest of campus. In the vicinity of <br />Taft Hill Road and Vme Drive, 3.5 inches of precipitation was reported. Local flooding <br />occurred and would have become severe had the rains continued. Rainfall totals <br />diminished greatly south from campus, Another moderate shower fell on the afternoon of <br />June 25th. <br /> <br />July 28-29, 1997 4.63 inches in one day, 6.17 inches in two days <br /> <br />Rains began July 27th early evening with light rain in town but with significant rainfall of2 <br />to 9 inches near the foothills overnight through midday July 28th southwest through <br />northwest of Fort Collins. Very intense rains fell during the evening of July 28 over <br />western and central Fort Collins causing severe flash flooding and five fatalities. As much <br />as 10 inches fell in less than five hours 3-4 miles southwest of campus. The maximum <br />observed rainfa1l was 14.5 inches in approximately 30 hours 3-4 miles southwest of <br />campus. Ten inch storm totals were common near the base of the foothills. <br /> <br />55 <br />
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