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FLOODC00270
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Last modified
1/29/2010 10:12:24 AM
Creation date
9/30/2006 6:54:46 PM
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Template:
Floodplain Documents
County
Jefferson
Arapahoe
Title
Chatfield Reallocation Study: Storage Use Patterns 2/1/2003
Date
2/1/2003
Prepared For
Jefferson County / Arapahoe County
Prepared By
US Army Corps of Engineers/CWCB
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />SECTION 7 <br /> <br />CONCLUSIONS AND RECOMMENDATIONS <br /> <br />Results from this investigation indicate that there is additional storage space available in <br />Chatfield Reservoir, and that there are sufficient water rights and demand to utilize this <br />additional storage. Based on the data and analysis presented in this report, the following detailed <br />conclusions and recommendations are presented: <br /> <br />1. Available water rights to those entities expressing interest in acquiring and <br />utilizing reallocated slOrage space in Chatfield Reservoir are sufficient to allow <br />these entities to make efficient use of at least 20,600 acre-feet of reallocated <br />Chatfield Reservoir storage. <br /> <br />2. If the new HEC-5 modeling runs by the Omaha District, U.S. Army Corps of <br />Engineers for investigating Chatfield Reservoir, Bear Creek Reservoir and Cherry <br />Creek Reservoir system operations indicate potential for reallocating more than <br />20,600 acre-feet of storage in Chatfield Reservoir, the analysis described in this <br />report for determining the effects of reallocating Chatfield Reservoir storage <br />could be repeated for a larger reallocated storage pool. <br /> <br />3. Operation of reallocated storage in Chatfield Reservoir to meet Denver Water's <br />demand schedule produced the greatest average increase in Chatfield Reservoir <br />water surface elevations (approximately 9 feet for the 20,600 acre-feet reallocated <br />storage pool) and operation for the South Metro Water Users resulted in the least <br />average increase in water surface elevations (approximately 3.5 feet for the <br />20,600 acre-feet pool). These average increases of9 feet and 3.5 feet are on top <br />of the fluctuating Denver Water operations pool. <br /> <br />4. It will be necessary for those entities who are concerned with increased reservoir <br />water surface elevations in Chatfield Reservoir resulting from storage reallocation <br />to carefully review the results presented in Figures l-E through l5-E herein to <br />determine the increased frequency of higher reservoir water surface elevations. <br /> <br />5. During the study period, there are drought years in which there was no water <br />available for storage in the reallocated storage pools. During these drought years, <br />consequently, there would be no effect on reservoir water surface elevations from <br />reallocation of storage space. <br /> <br />6. To further explore feasibility for Chatfield storage reallocation, the Corps should <br />perform a detailed hydraulic analysis to determine the effects that storage <br />reaJlocation would have on the flood control function of the reservoir. This <br />analysis should also take into account environmental and recreational impacts <br />from increased pool size. <br /> <br />P:\Data\GEN\CWCB\Chatfield\Report 12.02\RevisedCha lReport 1 03\Report2-03 .doc <br /> <br />19 <br />
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