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<br />extreme height. This is to be chiefly done by means of <br />the silt brought by the Storage Supply Canal from the <br />river. A dike parallel to the dam will be put up at a dis- <br />tance of say 200 feet from the dam, high enough to act <br />as a guide to the canal water, which would then be forced <br />to enter the reservoir through the spillway at the far end <br />of the dam. During its progress through this broad chan- <br />nel, v/ithout grade, the silt would be forced to drop, and <br />in this way a wide embankment can be speedily built <br />up, reinforcing the present dam very effectually. While <br />it may take two or three years to build a dike sufficiently <br />wide to give a safe beach slope to avoid the necessity <br />of using rip-rap, the material thus deposited wiil be su- <br />perior in quality to that of the local soil, and more sub- <br />stantially consolidated. An example of this simple <br />method of strengthening an earth dam is to be seen at <br />the Henry Reservoir, near Sugar City, where this identi- <br />cal method is being successfully employed. The method <br />of building is certainly economical and most commend- <br />able from every point of view. The great Gatun Dam, at <br />Panama, is being built on very much the same prin- <br />ciple. <br /> <br />WATER SUPPLY. <br /> <br />Horse Creek, as a source of supply to feed this reser- <br />voir, sometimes carries much grea:er volume of water <br />than the capacity of the present Canal. It has a \vater- <br />shed area of about 1 ,228 square miles. from which it is <br />not unreasonable to expect a flood run-off of 20 sec- <br />ond-feet per square mile. or say 25,000 cubic feet per <br />second. For this reason it may be advisable to prepare <br />to divert water from this Creek into the Storage Canal <br /> <br />46 <br />