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Last modified
3/26/2010 3:55:22 PM
Creation date
9/30/2006 10:21:06 PM
Metadata
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Template:
Publications
Year
1997
Title
Report on Ground Water Recharge and Mangement Project Rio Grande Basin, Colorado
CWCB Section
Finance
Author
Davis Engineering Service, Inc.
Description
Data for understanding mechanism of ground water recharge in the San Luis Valley & construct major recharge structure to facilitate ground water storage with winter surface diverersion
Publications - Doc Type
Tech Report
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<br />1 <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 /> <br />One of the primary resources that can be managed to allow better utilization of surface water <br /> <br /> <br />supplies are the underground aquifers in the San Luis Valley. By storage of surface water rights <br /> <br /> <br />in the aquifers, the aquifers can function as under ground water storage reservoirs. The filling of <br /> <br /> <br />the aquifers has historically occurred, but in an unplanned manner that has resulted in overfilling <br /> <br /> <br />in some areas and under-filling in other areas. One of the objectives of this project was to assist <br /> <br /> <br />in developing a better understanding of the dynamics of ground water recharge in the San Luis <br /> <br /> <br />Valley and to convey this information to water users and managers to facilitate maximum water <br /> <br /> <br />utilization and conservation. <br /> <br />Since elimination of the Rio Grande Compact debt, over delivery to the Compact has occurred in <br /> <br /> <br />several individual years. These over deliveries result in credits that may be used to reduce <br /> <br /> <br />Compact deliveries in subsequent years. However, the credits are subject to evaporation losses <br /> <br />in Elephant Butte Reservoir. It may be possible to reduce these over deliveries and efficiently <br /> <br /> <br />store more water in the aquifers ofthe San Luis Valley. This may be accomplished by means of <br /> <br /> <br />better managed irrigation season diversions and maximizing winter ground water recharge. In <br /> <br />many years the potential for Compact over deliveries do not become apparent until October or <br /> <br />November which is near the end of the accounting year for the Compact. It is also near the time <br /> <br />when ditches can be frozen shut by cold weather. During wet years and in the late fall or early <br /> <br /> <br />winter, the aquifers could be partially refilled, thereby supplying the ground water to be <br /> <br />withdrawn by wells during dry years. <br /> <br />Recharge of ground water has been difficult during November and December due to the forming <br /> <br /> <br />of ice in diversion structures and canal laterals. Additionally, changes in irrigation practices <br /> <br /> <br />from flood irrigation to significant numbers of center-pivot sprinkler systems that require less <br /> <br /> <br />volume of water has made it difficult for irrigators to use large wet year flows that can occur in <br /> <br /> <br />the spring. One of the objectives of this project was to construct a significant recharge structure <br /> <br /> <br />specifically designed to overcome much of the icing problems and provide additional capacity to <br /> <br />allow large diversions from the river during flood conditions. <br /> <br />1-2 <br />
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