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<br />c.:'> <br /> <br />, ' <br />-' <br /> <br />L" <br />C~, per port and gives some flexibility if you wish to adjust the gates. <br />-, <br /> <br />I"~' . <br />-' <br /> <br />The other method is to let the concrete set up for a day, drill out <br />the level of holes, and seal the pipe into the ditch. The final product <br />of this operation looks like the picture No. 2 above. This method seems <br />to hold the most promise because the holes are easier to place on the level <br />and the contractor is not rushed to keep up with the concrete pouring of <br />the ditch. <br /> <br />. <br /> <br />A new divider box and measuring flume was installed on the Thompson <br />Farm. The Bureau of Reclamation has recognized these devices as essential <br />to good water management and they have taken steps to see that they will <br />be included in their lateral design for the valley. <br /> <br />.k-. <br /> <br /> <br />I~' II <br />~ '<~ ,_ _~ /1;, <br />,~ <br /> <br />o ~o'" <br /> <br />The above pictured trash screen with water driven brushes has been <br />installed and highly recommended as a method to prevent clogging of ditch <br />ports. <br /> <br />The pump back system consists of an enlarged holding pond (80,000 Gals.), <br />a 7~ HP tail water pump, and about 2400 ft. of return flO\v pipe. This system <br />was not built to demonstrate its use but rather to dispel1 any doubt about <br />the quality of tail water return flows. About 1/3 of the inflow water leaves <br />the farm as tail water runoff. We have found that this water is relatively <br />the same quality as their inflow water, and that it can and should be put <br />to beneficial use rather than being dumped into the nearest drain to become <br />a source of contamination to the river. The overall plan for the valley will <br />include a collector system that will place these runoff waters back into the <br />supply system for further use or channel them back to the river, <br /> <br />- 17 - <br />