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Last modified
1/26/2010 2:54:15 PM
Creation date
10/12/2006 3:41:27 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8056
Description
Drought Preparedness
State
CO
Basin
Statewide
Date
8/1/1996
Author
Colo Climate Center
Title
Colorado Climate - August 1996 through June 1999 - Volume 19 Number 6
Water Supply Pro - Doc Type
Publication
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<br />" <br /> <br />1'\11:1 Q?? <br />. . '-'... .' -. .~ <br />flooding in California and the Pacific Northwest is rarely <br />a problem in Colorado. However, some significant <br />contribution from snowmelt may have been present in this <br />storm. The 1999 floods were classic ''volume floods," <br />with flows on the Arkllnsas River, the Poudre and the <br />South Platte far exceeding the high flows typically associ- <br />ated with snowmelt floods. Rains diminshed late in the <br />day on the 30th in northern Colorado but continued in <br />southern Colorado ending on May I. The mountains and <br />Western Slope received beneficial moisture and mountain <br />snows. Those areas were not afl'ected by flooding. <br /> <br />The following map shows total rainfall for the period <br />April 28 through May 3, 1999 for National Weather <br />Service official cooperative observing sites in Colorado. <br />The majority of this rainfall accumulated between late <br />evening on the 28th and midday May I. The maximum <br />. rainfall was concentrated near the eastern base of the <br />mountains and on the higher ground north and south of <br />the Arkllnsas River. Tlie Denver-Boulder area received <br />moderate'rains, but with southeasterly flow was partially <br />shielded by the higher terrain of Monument Hill to the <br />south. The maximum rainfall at any official National <br />Weather Service sllltions was measured at Rye in the Wet <br />Mountains southwest ofPucblo with nearly 8 inches of <br />precipitation. This was just two inches less than fell <br /> <br />during a two-day intense rain back in mid May of 1955; <br />the highest documented rainfall of record for tl1at area. <br />Rainfall also exceeded seven inches immediately west and <br />north of Colorado Springs with six-inch totals ~xtenaed <br />eastward into southern Elbert County. Local sourceS <br />showed as much as 14 inches may have fallen over north- <br />west portions of the city. A secondaJy rainfall maximum <br />exceeding six inches occurred in the Llirimer COnny . <br />foothills possibly extending into northwest Weld County. <br />Local areas in the. lower foothills west of Fort Collins.tnay <br />have received eight inches or mOre. Portions of Las <br />Animas and Baca Counties also received very heavy rains. <br /> <br />" <br />" -."*: <br /> <br /> <br />Reports detailing the magnitudes, nature and extent of <br />flooding in Colorado from this storm will be prepared in <br />the coming months by the Colorado Water Conservation <br />Board, Division of Water Resources, Colorado Depart- <br />ment of Natural Resources. Overall, peak flows' on the <br />Arkllnsas River at La Junta may have been comparable to <br />the 1965 floods. Downstream, flooding was not'assevere <br />as the June 1965 extreme events, butwas sufficient to put , <br />huge volumes in storage at John Martin Reservoir. . Flood <br />dalilage on Fountain Creek, the ArkllnsasRiver,and the <br />Poudre River as wen as other tributaries were sulJicient to <br />produce a federa1 disaster declaration. This appears to be <br />the greatest rainfall. and flooding event to.occur In April. <br /> <br />COLORADO <br /> <br /> <br />1 ,~ <br /> <br />, .,. " <br /> <br /> <br />l <br />j} <br />j <br />i] <br /> <br />, <br /> <br />. <br />" <br /> <br />Precipitation amounts (inches) for April 28 through May 3, 1999 Storm. <br /> <br />77 <br /> <br /> <br />-,- <br />
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