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<br />embankment to a height of 10 feet above the bottom <br />grade, but it is not intended to deepen it. as this would <br />involve a change in the siphon. Below' this siphon, how- <br />ever, it is intended to make the canal 3 feet deeper and <br />sufficiently wider to give the same capacity as in the <br />upper section. Additional siphon tubes would have to <br />be built at each of the three crossings, and aH the bridges <br />would have to be increased in length. The headgates <br />would also have to be doubled in width. These various <br />items involved in the enlargement are estimated to cost <br />$170,929.00. <br /> <br />WATER SUPPLY. <br /> <br />The watershed area of the Arkansas river and tributar- <br />ies above the head of the Supply Canal is, as already <br />noted, approximately 11,000 square miles, while an <br />additional 1200 SQuare miles of Horse Creek water- <br />I <br />shed may be intercepted above the crossing of the Stor- <br />age Canal by building another diverting dam and en- <br />larging the canal for about 4 miles, to a point where the <br />water thus diverted can be turned into the Horse Creek <br />Reservoir. The water supply available for storage and <br />direct irrigation under this canal is not susceptible of <br />very exact computation. as it is dependent upon the <br />variable seasons and the appropriations of other ca- <br />nals with senior rights. It can only be approximately <br />estimated from the recorDS of the past. I have had the <br />benefit of such records Kept in the office of the Superin- <br />tendent of the river, the Irrigation Division Engineer, for <br />the year 1904, 1906. 1907, 1908 and 1909. and these <br />show that during the usual irrigation seasor. from May <br />1 s:, to October 1 s:, the flow at various points ,-vas as fol- <br /> <br />41 <br />