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<br />. <br /> <br />"-, t\.... I: <br />l::..J'-'" <br /> <br />44 <br /> <br />undermined ~o~d be settled deeper and deeper into the <br /> <br />river bed. <br /> <br />This process would be repeated in such manner as to <br /> <br />secure the largest possible action of the water in scouring <br /> <br />out the foundation and settling the large rock fro:n the <br /> <br />cliffs as low as possible into the fou.~Qation. This proceed- <br /> <br />ing from upstream to downstream woula. pave the foundation <br /> <br />progressively with large rock as ddeply embedded as pOS3ible. <br /> <br />T!le process rof blocflng rock from ,the cliffs above by means <br /> <br />of tunnels parallel to the r:i.ver pac~"ed with black powder <br /> <br />would be repeated at such points that the re~uired rock fill <br /> <br />. <br /> <br />would be built as nearly as pradticable to the height desired <br /> <br />on the re~uired slopes, the river being used to the maximum <br /> <br />extent in s~ttling the rock into the foundation and all sur- <br /> <br />plus waters drawn off through the tunnels. It is obvious <br /> <br />that masses of granite could be secured in this way very much <br /> <br />larger than could be feasibly moved by ordinary mech~llsm. <br /> <br />During th3 early stages of construction when the "~ss is <br /> <br />of moderate hei~~t it would be necessary to take the flood <br /> <br />waters of the river over the structure, and this action <br /> <br />would be used to the greatest possible extent in thoroughly <br /> <br />paving the foundation with the hSdvieat rock obtainable. <br /> <br />As the structure increased in height the sto~age above <br /> <br />, <br /> <br />it would increase ia volume rapidly, and at moderate heights <br /> <br />. <br /> <br />the storags capacity and the tunnel capacity COmbined vrould <br />