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Last modified
8/11/2009 11:41:47 AM
Creation date
9/30/2006 10:16:33 PM
Metadata
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Publications
Year
1998
Title
Denver Basin and South Platte River Basin Technical Study: Technical Addendum 1 and 2
Author
Special Water Committee
Description
Technical addendums for the report
Publications - Doc Type
Tech Report
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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 />Chapter 1: South Platte Basin Inventory <br /> <br />March 21,1998 <br />Page 1-17 <br /> <br />compared to the total use estimate, The data shows that municipal production from the <br />Denver Basin aquifers is 42.6 percent of the total use, irrigation is 21.5 percent, <br />commercial and industrial use is 1 0.1 percent, domestic and livestock is 24,6 percent, <br />and household use only is 1.1 percent of the total. <br /> <br />With an average accuracy of plus or minus 30 percent on the commercial- <br />industrial, irrigation, domestic use, and household use only production estimates, total <br />production from the Denver Basin aquifers is estimated to range from 48,406 to 68,542 <br />acre-feet in 1996. On a continuous annual production basis these volumes convert to <br />66.9 and 94.7 cfs, respectively, <br /> <br />1.3 SURFACE WATER RETURN FLOW AND REUSE ESTIMATES FROM THE <br />DENVER BASIN AQUIFERS <br /> <br />A portion of the groundwater pumped from the Denver Basin aquifers for each <br />beneficial use is returned to the surface water system, Return flow percentages are <br />high, (90 percent), for household use only and commercial and industrial uses, and low, . <br />(20 percent), for irrigation use. The municipal and domestic and livestock return flow <br />percentage, 50 percent, reflects a combination of in-house and irrigation use and is <br />based on monthly use patterns typical of Douglas County municipal water users, For <br />Douglas County municipal users, in-house use was assumed to be 5% consumptive <br />and irrigation use was assumed to be 84% consumptive, The estimated 1996 <br />production, return flow percentages, and gross return flow volumes are shown on Table <br />1-21. From the estimated 1996 production from the Denver Basin aquifers of 58,474 <br />acre-feet, 28,522 acre-feet is estimated to return to the surface water system, This <br />volume of production and gross return flow represents a gross return flow percentage of <br />49 percent (28,522 af/58,474 af). <br /> <br />Return flows generated from municipal use of Denver basin groundwater are <br />legally reusable. Some groundwater suppliers are currently reusing a portion of their <br />groundwater return flows for augmenting alluvial well pumping and for direct irrigation <br />purposes. Estimates of current levels of reuse of groundwater return flows were <br />obtained from groundwater suppliers in Douglas and Arapahoe Counties, <br />Approximately 2,400 acre-feet per year of Denver Basin groundwater return flows are <br />currently being consumed through augmentation and direct use, <br /> <br />Hydrosphere Resource Consultants. 1002 Walnut Surte 200. Soulder. CO 80302 <br />
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