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<br />, <br /> <br />CHART 4. DEEP PERCOLATION COMPARISON BY CROP <br /> <br />l\) <br />t.,) This comparison shows the comparison of the average, deep percolation of <br />~? unimproved and improved systems by individual crops. Also a baseline <br />~ using the average deep percolation of all unimproved systems and all <br />crops. <br /> <br />The trend here shows a reduction in the deep percolation for all crops <br />except for beans which remained the same. <br /> <br />Salinity Trends: Each fall, for eleven years (1984-1994), quantitative <br />salt determinations have been made at depths of 6, 18, and 30 inches for <br />each monitoring site. It shows no changes in salinity levels over this <br />time period and for this reason the study was discontinued. <br /> <br />Conclusion w/Future M&E Plans <br /> <br />7CFR Part 702.1e states that the Secretary is authorized to monitor and <br />evaluate changes in salt contributions to the Colorado River. The data <br />collected, at a cost of approximately $705,000, over the eleven year <br />period is a comprehensive analysis of the effects of the project on salt <br />contributions to the river. Definite trends have been quantified. <br />Based on the data collected and deep percolation reduction trends, <br />greater than project expectations, it is proposed to: <br /> <br />. Continue full site monitoring on three sites (including continuation <br />of site #21 to maintain longevity site and monitor complete crop <br />rotation under improved system). <br /> <br />14 <br />