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<br />co <br />r-- <br />N <br />o <br /> <br />CHAPTER IV <br /> <br />STAGE ONE DEVELOPMENT AND MONITORING <br /> <br />'""" <br /> <br />The laterals were not fully installed for the 1982 irrigation season; <br /> <br />however, the expected lateral seepage of 2,940 acre-feet was from the <br /> <br />unconstructed laterals. The salt loading from laterals has been reduced <br /> <br />by 6,710 tons. <br /> <br />The first full irrigation season in which monitoring with all <br /> <br />the Stage One systems improvements installed can occur will be in 1983. <br /> <br />Data gathering will continue in 1983 with the collection of drain and <br /> <br />canal flow measurements, water table elevations, photographs, and water <br /> <br />quality data. The flow and quality data are being analyzed to quantify <br /> <br />the salt loading in the system. The other data provide empirical evi- <br /> <br />dence of effects. <br /> <br />Monitoring results to date provide a good check on <br /> <br />Stage One planning assumptions and are summarized in Table 3. <br /> <br />Table 3 <br />Seepage and salt loading reductions <br />resulting from Stage One improvements <br />Salt <br />loading <br />reduction <br />(tons) <br /> <br />Seepage <br />reduction <br />(acre-feet) <br /> <br />Mg/L <br />effect at <br />Imperial <br />Dam <br /> <br />1981 <br />CanatV <br />Lateralsl/ <br />Total <br /> <br />1,370 <br /> <br />5,420 <br /> <br />0.55 <br /> <br />1,370 <br /> <br />5,420 <br /> <br />.55 <br /> <br />1982 <br />Canal <br />Lateralsl/ <br />Total <br />Long-term projected <br />Canal l, 290 5.290 <br />Laterals 4,930 19,270 <br />Total 6,220 24,560 <br />1/ Canal lining completed in March 1981. <br />2/ No laterals were lined until October 1981. <br />3/ A portion of the lateral lining was completed <br />the 1982 irrigation season. <br /> <br />1,310 <br />1,960 <br />3,270 <br /> <br />5,000 <br />6,710 <br />11,710 <br /> <br />.51 <br />.68 <br />1.19 <br /> <br />.53 <br />1. 95 <br />2.48 <br /> <br />prior to <br /> <br />25 <br />