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WSPC00539
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WSPC00539
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Last modified
1/26/2010 10:50:28 AM
Creation date
10/9/2006 2:14:58 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8530.300
Description
Rio Grande Basin-Water User Groups and Conservancy Districts-Rio Grande Water Conservation District
State
CO
Basin
Rio Grande
Water Division
3
Date
7/20/1970
Title
WCD-Rio Grande Water Conservation District-Corres Reports etc-1967-82-Preliminary Engineering Report for the Rio Grande Water Conservation District
Water Supply Pro - Doc Type
Report/Study
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<br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br /> <br />7 <br /> <br />80 that the water developed would meet the quality standards specified in the Com- <br />pact. As explained previously many farmers, and also domestic users, depend <br />largely on an adequate ground water supply which could easily be jeopardized by <br />extensive use in conjunction with the drainage projects. <br /> <br />It is recognized that the amount of vater lost annually to evapotranspiration <br />in the potential drainage area varies from year to year. The Rock Creek report <br />estimates that approximately 0.75 acre feet of water per acre is lost annually by <br />evaporation and plant consumption. The estimate is supported by the 1964 <br />Reconnaissancc Report published by the Bureau of Reclamation. It is this water <br />which is lost through nonbeneficial USes that should be the prime target of <br />drainage projecta. <br /> <br />The installation of wells increases initial coat as well as operation and <br />maintenance costs. <br /> <br />It is felt that much more information is needed before the proper decisions <br />can be made relative to the merits of the use of wells in conjunction with <br />drainage projects. A few questions are included for consideration. Is <br />enough known about the ground vater that future development and use will not <br />be jeopardized by the wells? IVhen the Hio Grande Compact was drawn up, supposedly <br />enough was known about the surface water that present and future uses were being <br />protected. ffistory has proven that this was not the caae. Could the same effect <br />result in the case of ground water? Are wells a must to provide quality and <br />quantity of water to sstisfy the Compact? Will adequste drainage remove salts <br />from drainage areas and result in reduction of salt concentrations over a period <br />of time? CaD open or closed drains provide sufficient lowering of the water <br />table to eliminate or reduce evapotranspiration losses and also provide adequate <br />means for control and administration? Must more water be salvaged than is being <br />lost through nonbeneficial use? <br /> <br />The preliminary cnnclusions as a result of this study to this time would in- <br />dicate that properl~ constructed drains would provide sufficient lowering of the <br />water table to salvage substantial quantities of water. <br /> <br />While we are unable to accurately predict, at this point, the quality of the <br />water initially salvaged from any particular project, we feel at least on a <br />preliminary basis, that any concentration of salt would be reduced as the drains <br />are utilizsd so that over a period of time the quality of water developed would <br />be improved. <br /> <br />If further study and experience prove these preliminary conclusions to be correct <br />then it would seem to be unnecessary to expose the water users of the San Luis <br />Valley to the riak that salvage by the use of wells would adversely affect their <br />ground water supply. <br /> <br />It is recommended that appropriste gaging stations be established in conjunc- <br />tion with all drainage and channelization projects in order to facilitate <br />operation, evaluation and administration of such projects. In addition, it is <br />anticipated that any project proposed and implemented will meet with Some <br />opposition from those who feel that they are being damaged. Therefore, <br /> <br />0554 <br />
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