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Last modified
1/29/2010 10:12:08 AM
Creation date
2/27/2007 8:16:41 AM
Metadata
Fields
Template:
Floodplain Documents
County
Arapahoe
Jefferson
Stream Name
South Platte River
Basin
South Platte
Title
Chatfield Reallocation Study Storage Use Patterns
Date
2/1/2003
Prepared For
CWCB
Prepared By
Brown and Caldwell
Floodplain - Doc Type
Project
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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 />Table ES-1. <br /> <br />Frequency Entity Met its Target Release for 1946-1990 <br />Scenario 20,600 AF Pool 7,700 AF Pool <br />88.6% 84.9% <br />78.0% 50.2% <br />90.8% 85.9% <br /> <br />2,900 AF Pool <br />83.4% <br />32.3% <br />83.2% <br />99.7% <br /> <br />1. Denver <br /> <br />2. Central <br /> <br />3. Greenway and Littleton <br /> <br />4. South Metro. <br />5. Mixed Use: Central and <br />Greenway/Littleton 55.1 % 40.5% 26.5% <br />*Frequency of meeting target release is very high because the targets provided by South Metro were based on <br />modeled storage results which indicated these targets could be met 100 percent of the time. <br /> <br />99.3% <br /> <br />99.5% <br /> <br />Tables ES-2 and ES-3 below compare: (1) the average daily increase in Chatfield Reservoir <br />water surface elevation (in feet) that resulted from the reallocated storage space with (2) the <br />present situation in which there is no reallocated storage space. <br /> <br />Table ES-2. Average Daily Increase in Chatfield Reservoir Water Surface Elevation <br />With Storage Reallocation for 1946-1990 (feet) <br /> <br /> Greenway and Central and <br />Pool Size (AF) Denver Water Central Littleton South Metro Greenway/Littleton <br />~0,600 8.97 6.28 6.22 3.48 4.69 <br />7,700 3.80 1.63 2.08 2.36 1.34 <br />12,900 1.53 0.40 0.69 1.42 0.34 <br /> <br />Table ES-3. Average Daily Increase in Chatfield Reservoir Water Surface Elevation With <br />Storage Reallocation for Memorial Day to Labor Day for 1946-1990 (feet) <br /> <br /> Greenway and Central and <br />Pool Size (AF) Denver Water Central Littleton South Metro Greenway/Littleton <br />20,600 9.38 6.84 6.90 5.24 5.40 <br />7,700 3.88 2.07 2.43 2.84 1.80 <br />2,900 1.57 0.73 0.93 1.16 0.68 <br /> <br />In conclusion, results from this investigation indicate that there is additional storage space <br />available in Chatfield Reservoir, and that there are sufficient water rights and demand to utilize <br />this additional storage. Based on the data, analysis and findings from this investigation, the <br />following detailed conclusions and recommendations are presented: <br /> <br />I. Available water rights to those entities expressing interest in acquiring and <br />utilizing reallocated storage 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. Ifthe new HEC-5 runs by the Omaha District, U.S. Army Corps of Engineers for <br />investigating Chatfield Reservoir, Bear Creek Reservoir and Cherry Creek <br />Reservoir system operations indicate potential for reallocating more than 20,600 <br />acre-feet of storage in Chatfield Reservoir, the analysis described in this report for <br />determining the effects of reallocating Chatfield Reservoir storage could be <br />repeated for a larger reallocated storage pool. <br /> <br />P:\Data \GEN\CWCB\Chatfield\Report 12.02\RevisedChatReportl 03\Report2-03 .doc <br /> <br />4 <br />
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