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<br />00005"" <br />1r-=------- <br />!I <br />I, <br />[I <br />c' II <br />I, <br />II <br />.-; 'I <br /> <br /> , <br /> I <br /> :1 <br /> !I <br /> I[ <br /> II <br /> , <br /> il <br /> II <br /> :j <br /> I, <br /> , <br />'~ ,I <br />- 'I <br /> I <br />, i <br /> ii <br /> il <br /> " <br /> \1 <br /> :1 <br /> <br />-.' <br /> <br />" <br /> <br />. <br />" <br /> <br />- - >---- -. <br /> <br />-2'1- <br /> <br />We have not attempted to evaluate the costs 01 the various <br /> <br />cutoff possibilities nor th~,benefits, but believe the benefits <br />'. <br /> <br />might very well exceed the costs. <br /> <br />03srnVATIONS AND RECOMMENDATIONS <br /> <br />As a result of our investigation and study of the lower Weld <br /> <br />County site and comparing it to the engineering and geologic <br /> <br />" <br /> <br />conditions at the Narrows site, we have made certain observations <br /> <br />and prep.u'ed recommendations which are given below. These obser- <br /> <br />vations are entirely confined to geological and engineering <br /> <br />aspects and do not deal with or consider other project evaluation <br /> <br />matters such as land evaluations, water distribution and use, <br /> <br />highway and railroad relocations, etc. <br /> <br />Probably the most important factor in evaluating the geo- <br /> <br />logical conditions at the two alternate sites is the location of <br /> <br />the ancient steep channel of the South Platte River relative to <br /> <br />the location of the two axes. At Narrows the old channel is 10- <br /> <br />eated away from the proposed dam and because of this "bypass" <br /> <br />effect there is no way to control the deep underflow of the river. <br /> <br />Consequently, this amoLlnt of water is automatically lost to the <br /> <br />project. At the Weld County site the deep channel is present be- <br /> <br />neath the proposed dam and although considerable expense would be <br /> <br />involved, it is definitely possible to control the underflow to <br /> <br />an essentially complete cutoff. <br /> <br />, <br />" <br /> <br />A second significant factor revealed by this investigation <br /> <br />is that the estimated reservoir seepage at the lower weld County <br /> <br />site is much less than had been expected. This is undoubtedly <br /> <br />due to the blanketing effect of the upper flood plain sediments <br /> <br />lying between the reservoir and the highly pervious deep channel <br /> <br />I' <br /> <br />,', <br /> <br />r- ....".~. - '. .",. -.~\~' .', .'.. -If';" - "-_ <br /> <br />-- .--- - - <br />---"-- - <br />