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001367 -:1 -3- in pipe frhctio~~~~~ both pumps on a lift are operating at full load, it is felt that th~J~ctual output of the two pumps would be increased if one pump were not, as is obviously the case, boosting the other. It is rarely possible ~d;2i1 the present condition to secure from both pumps of either lift the nominaJ:/j:'-l.iiiip capa- city, although either pump alone will deliver more than its rated output. A study of thea friction in the pipe connecting the pumps to the delivery pipes and at the junctions of these pipes might result in changes that would materially increase pump deliveries at times of maximum demand. The inventory contains proposals for the lining of about one-third the length of the distribution canals. This would reduce canal loss on what are believed to be the sections where most of such loss occurs. With a steady increase in lined laterals the canal lining would serve to reduce distribution losses to a minimum. It is realized that when the reduction of such losses has been carried to a certain point increased application of ir 'igation water will become necessary in order to main- tain grouud water at proper depth, but reduction of main canal losses will make morA water available up to that point and permit a closer control of ground water. There are many miles of canal in the Grand Valley just aicout the size of the Orchard Mesa dis:ribution canals. Most of such canal need lining, for one ~.~th- er reason. In view of this it is desirable to work out a system of lining ~ all can use. In so far as this results in common methods, equipment that can be used by all, and work, because of good equipment and familiarity with the method, the whole vall ey will be the gainer. The form of lining heretofore tried on the Yuma projec~hould be investigated to determine if it can be utilized in the Grand Valley. This lining consists of a concrete bottom run in place on a tr~ed subgrade which has been covered with 4 or 6 inches of clean gravel, and of sides, plant made, four feet by six feet in dimen- sion, laid to rather steep side slopes, with the six foot sides longitudinal. On the Yuma project no attempt was made to seal these sides to each other or to the bottom (probably because of sandt soil) , but it is felt that such a seal is desir- able and could be made by inse~ng in the bottom and on the ends and bottoms of the slabs, prepared felt wedges that would effectively seal these ijoints. The ad- vantage of this form of lining is that it results in the minimum of fine grading, and divides the two sorts of concrete work so that each is perfElElmed it), the best manner. Running the bottom in place is the most economical, especially if transit mix concrete is available, as will soon be the case in the Grand Valley. The side slabs, very difficult to run on the ground,can be made on sturdy forms in the shop with a much better quality and the hadnwork on the ground will consist only of backfill and tamping to form a steep sided trapezoidal section. Incident to such lining it is proposed that much crooked alignment be elim- inated. This consists of sharp bends where the canals contour up draws or around small points. The earth moving equipment listed in the inventory is intended to be used for such wor~s well as for cleaning drain ditches and improving roadway on ditch banks as an incidental to the principal purpose. Besides the reduction in ditch to be lined such badly aligned canal is nearly always the place where loss is greatest. It has not been possible during the war to do any except emergency mainten- ance work on the drainage system. All drains are badly in need of cleaning and the old spoil banks will therefore needed to be levelled. If the equipment shown in