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<br /> <br />. <br /> <br />c..J <br />N <br /><:::> <br />o <br /> <br />E.s~ <br /> <br />22. <br /> <br />A modern concrete-lined irrigation <br />gates which can be closed in order <br />of water into the desired channel. <br />alfalfa. Installation is near Red <br /> <br />canal. Note control <br />to regulate the flow <br />The crop is <br />Bluff, California. <br /> <br />87 <br /> <br />23. Steel mainline (42 inch penstock) capable of delivering <br />50 cubic feet per second of irrigation water to 3000 <br />acres of cropland. Near Payette, Idaho. 88 <br /> <br />24. Irrigation pi~e being delivered by helicopter to site <br />in mQuntainous terrain. This 30 inch flume will <br />deliver snow-melt runoff water directly to an open <br />diversion ditch. Near Gypsum, Colorado. <br /> <br />89 <br /> <br />25. Earthen irrigation storage reservoir being lined with <br />grout or "gunnit€" reinforced with wire mesh. Sealing <br />the walls and floor of the structure virtually <br />eliminates seepage. San Diego County, California. 91 <br /> <br />26. Polyethylene lining being placed in large irrigation <br />reservoir to render the water~holding facility <br />impervious to leakage. Riverside County, California. 92 <br /> <br />27. On-farm irrigation tailwater return pit. Intercepted <br />water is recycled by pumping through a plastic pipeline <br />to a concrete-lined ditch for reuse. Near Pecos, <br />Texas. 106 <br /> <br />Ela~~ <br /> <br />I <br /> <br />Significant Irrigation Areas in the Seventeen Western <br />Conterminous states. <br /> <br />37 <br /> <br />vii <br /> <br />-~;. <br /> <br />'-:~ <br /> <br />