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FLOOD09982
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Last modified
1/26/2010 10:11:22 AM
Creation date
10/5/2006 4:47:20 AM
Metadata
Fields
Template:
Floodplain Documents
County
Garfield
Community
Battlement Mesa
Stream Name
Colorado River
Basin
Colorado Mainstem
Title
Battlement Mesa Storm Drainage and Floodplain Study
Date
3/1/1975
Prepared For
CWCB
Prepared By
Frasier & Gingery, Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br /> <br />Page Four <br />Battlement Mesa Development Storm Drainage and Flood Plain Study <br /> <br />detailed studies for short duration-high intensity storms which <br />are normally critical for urban drainage design. Certain <br />extrapolations and extension of available data, based upon <br />engineering judgement and knowledge of the region, have been <br />necessary to develop the design rainfall curves contained in <br />this report. <br /> <br />I <br /> <br />The basic precipitation data has been taken from the <br />"Precipitation Frequency Maps for Colorado," published in <br />October, 1967. These maps are by far the most detailed isohyetal <br />maps for Colorado. The maps present depth of rainfall for the <br />two-year, five-year, ten-year, 25-year, 50-year, and 100-year <br />storm occurrenC'2 for a six-hour and 24-hour duration. However, no <br />procedures are recommended for extending the rainfall depth- <br />frequency relationships to shorter duration storms than the <br />six-hour period. <br /> <br />I <br />I <br />I <br /> <br />Technical Paper No. 28, "Rainfall Intensities for Local <br />Drainage Design in Western united States," includes rainfall <br />depth for storm~; of a one-hour, six-hour, and 24-hour duration <br />for a two-year return frequency. A graph is also included <br />for extending this data to storms with as short a duration as <br />20 minutes. ThE' difficulty with this paper is that it is not <br />nearly as detailed as the Precipitation Frequency Maps for <br />Colorado. <br /> <br />I <br /> <br />Technical Paper 40 includes a rainfall depth-duration <br />diagram for extending durations to periods other than the 2-hour <br />and 24-hour storms shown on the maps. However, the maps cover <br />the entire United States, and do not accurately reflect local <br />variations, such as may be encountered in the Battlement Mesa <br />area. <br /> <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />The Denver area Urban Storm Drainage Criteria Manual con- <br />tains graphs for reducina rainfall depth data to storm durations <br />as short as fiVE' minutes. However, the rainfall data contained <br />in the manual are applicable only in the Denver Metropolitan <br />area. <br /> <br /> <br />Information deriveo from each of the sources was plotted <br />and analyzed. The relative accuracy and applicability of each <br />publication was evaluated. Based on the analysis and evaluation <br />the following procedure was adopted: <br /> <br />I <br />I <br />I <br /> <br />1. Use the basic 6-hour and 24-honr precipitation <br />values obtained from the Precipitation - Frequency <br />Maps for Colorado, dated October, 1967. <br />
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