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Last modified
1/25/2010 7:08:02 PM
Creation date
10/5/2006 2:01:58 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Proposal for Evaluating Extreme Precipitation for the Mountainous Areas of Colorado
Date
2/20/1996
Prepared For
State of Colorado
Prepared By
Extreme Precipitation Committee
Floodplain - Doc Type
Flood Mitigation/Flood Warning/Watershed Restoration
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<br />At this point, no special category has been used to distinguish stonns of tropical <br />origin. However, there are several stonns on the list that originated as huricanes or <br />tropical storms. At some future point it may be necessary to establish a new category, but <br />for now these stonns have been categorized as G or GLC. <br /> <br />LatlLong: Approximated latitude and longitude coordinates have been assigned near the <br />point of heaviest rainfall for the purpose of general mapping. Geographic Information <br />Systems users should be aware that no special effort was made at determining these <br />coordinates precisely. <br /> <br />Maximum Precipitation: Most stonns are assigned a maximum precipitation in inches and <br />hundredths. Where possible, these values are based on actual observed rainfall for the <br />specified time period that could range from one hour to several days. Rainfall amounts <br />may come from a variety of sources such as 1) official National Weather Service <br />precipitation gages, 2) other precipitation gages, 3) published storm reports in the NOAA <br />"Storm Data" publication, 4) bucket survey values and 5) other sources. In some cases, <br />the amount may be recorded as unknown or may appear as a very small number if no <br />official gages near the point of the storm report received heavy precipitation. Due to the <br />variety of information sources that have been utilized, it is difficult to find firm evidence to <br />document all maximum reported values. Similarly, some of the values from official <br />published data sources appear questionable due to any of a variety of potential <br />observational problems. A separate list of storms is appended that include some of the <br />more questionable heavy precipitation values that have been encountered while preparing <br />ihe stonn iisi. <br /> <br />Remarks: Brief supporting information accompanies most storm entries including <br />supplemental precipitation reports, flood information, etc. <br /> <br />USBR Storm File: An "X" in this column signifies that a hard copy information file exists <br />for this storm at the U.S. Bureau of Reclamation Flood Section at the Denver Federal <br />Center. <br /> <br />USBR Depth Area Duration Study: An "X" in this column indicates that a storm study <br />was conducted for this storm by the U.S. Bureau of Reclamation or a cooperating agency <br />that included a precipitation isohyetal analysis and the computation of storm depth-area- <br />duration curves. This information is on file at the U.S. Bureau of Reclamation Flood <br />Section at the Denver Federal Center. <br />
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