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<br />.' <br /> <br />DRAFT 5/9/77 <br /> <br />'0051 <br /> <br />NARROWS UNIT <br /> <br />1. Analysis of a Ground-Water Recharge System Alternative <br /> <br />Nondevelopment and ground-water supplies were both considered as <br /> <br />alternatives to the authorized Narrows Unit. Nondevelopment would <br /> <br />not meet the needs of the area. Additional ground-water pumping with- <br /> <br />out augmentation is not now allowed by the State and would probably cause <br /> <br />violation of the interstate compact. However, a general description and <br /> <br />possible impacts of a ground-wateJ:' plan.are described below. <br /> <br />The additional lands irrigated within this alternative would amount to <br /> <br />about 37,000 acres which is the new lands equivalent to the authorized <br /> <br />Narrows Unit. These lands would be provided a supply of water by the <br /> <br />installation of wells and pumping from the ground-water reservoir. <br /> <br />The estimated crop irrigation requirement for the 37,000 acres is about <br /> <br />47,000 acre-feet.. Assuming an irrigation efficiency of 70 percent, if <br /> <br />center pivot sprinkler systems are used, about 67,000 acre-feet of water <br /> <br />would be pumped annually with about 20,000 acre-feet returning to the <br /> <br />ground-water system. <br /> <br />It was found that if the water table were allowed. to rise to a maximum <br /> <br />of 20 feet. above existing levels beneath potential recharge ponds, it <br /> <br />would be necessary to have a total recharge area'approaching 12,000 <br /> <br />acres. The real constraint is the volume of water that can be physically <br /> <br />stored in the aquifer in the vicinity of the recharge site at any given point <br /> <br />in time. <br /> <br />~ ;........ <br /> <br />-. <br /> <br />"-'--- <br /> <br />L....X:....:.: <br /> <br />- <br /> <br />_. <br /> <br />- <br /> <br />t <br />--- <br /> <br />....... <br /> <br />. <br />- <br />