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I I I I I I I I I I I I I I I I I I I Tahle IV.B.6-1 Average Drip Irrigation Conservation Potential Crop lID Area Estimated Potential Saved Water Major Vegetables 90,469 AC 0.91 AF/AC Properly managed drip irrigation often increases yield and crop quality. Therefore, an increase in productivity is expected if this option is chosen. Increased productivity may also mean increased crop water use, and thus the actual water conservation will be less than estimated in this Chapter. In any case, as a result of increased yields and quality, the acreage under drip is likely to continue to slowly increase. IV.B.7 Linear Tracking Irrigation Linear tracking is a system of sprinkler irrigating a field using a linear move sprinkler. The system has a 1/8 or 1/4 mile flow line attached to each side through which the water travels under pressure and is sprayed onto the field near ground level. Three linear tracking sprinkler systems are currently being operated in cooperation with IMU. One is located on the Magnolia Lateral at Delivery 0, one is on Trifolium Lateral 12 at Delivery 227, and a third is under construction. While the operation is proving technically feasible, the full results are not yet known. Before this technology is widely adopted, a few test units would be needed to look at: 1) maintaining leaching, 2) limiting deep percolation on lighter loam and sandy soils, 3) muddying problems with the tires, and 4) increased soil surface evaporation losses. Typical orders for linear tracking systems are 2.5 to 5 cfs and are accommodated within IID's current rules. As with drip, a large increase in linear sprinkler irrigation systems might result in capacity problems for IID's operations. The linear tracking system is assumed to have tail water of one percent. Thus, the conservation savings attributed to irrigating with a linear tracking system is the tailwater resulting from the use Draft: Subject To Revision 1/2/96 48