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<br />_ O()30 5_l :__~-'-u -_-=----"- <br /> <br />--------- - "--+-- <br />------- --------- - - -. <br /> <br />I"----=-=-:.:= <br />,I <br />,I <br /> <br />!I <br /> <br />" <br />" <br />, <br />:,[' <br /> <br />r' <br />'I <br />'I <br />'I <br />:! <br /> <br />" <br /> <br />,- <br /> <br />-19 <br /> <br />and precipitation downstream re-enters the alluvium. <br /> <br />With a partial cutoff the groundwatCl' levels below the darn <br /> <br />will be raised and the recharge effect of the reservoir will tend <br /> <br />to keep water levels high. This can be of benefit to those down- <br /> <br />stream irrigators who have access to the SUbSllrface flood plain <br /> <br />I: of the river for installation of wells. However, it does not <br />,I <br />I affect a very large area. <br />,I <br /> <br />ii <br />, <br />,I <br />II <br />" <br />Ii <br />,I <br />;1 <br /> <br />" <br /> <br />. <br />f.. ,i <br />, <br /> <br />-'- <br /> <br />" <br /> <br />In the Narrows area, the land south of the proposed dam and <br /> <br />reservoir area is currently irrigated by large irrigation wells <br /> <br />which arc drilled into the sand and gravel of the old river chan- <br /> <br />nel. At present the water table in this area is higher in eleva- <br /> <br />tion than the South Platte River and is inclined toward and is <br /> <br />tributary to the river. The filling of a reservoir at Narrows <br /> <br />would raise the north end of this water table, callsing it to <br /> <br />flatten, or even to change direction of gradient. Such a condi- <br /> <br />tion would not only enhance the recharge condition of the aquifer, <br /> <br />" but would maintain a higher pumping level for irrigation wells. <br />ii <br />It is our opinion that a large irrigation area would receive bene- <br /> <br />! <br /> <br />~ <br /> <br />-, <br /> <br />. <br /> <br />fit froD! this situation. The legal significance of this type of <br /> <br />diversion of water from the reservoir is not within the preroga- <br /> <br />tive of this report. <br /> <br />CONTROL OF SEEPAGE <br /> <br />Narrows Axis <br /> <br />It is Ollr opinion that the seepage studies for the Narrows <br /> <br />A~is made by the U. S. Bureau of Reclamation were done by accepted <br /> <br />methods using reasonable asslunptions. As far as leakage from the <br /> <br />reservoir is concerned, we have used the U. S. Bureau of <br /> <br />Reclamation electric analogy study results for comparison with our <br />