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<br />This trend indicates a marked reduction from unimproved to the most <br />technically improved system. <br /> <br />I'\) <br />. l",' <br />'-0 <br />C. <br /> <br />Deep percolation reductions shown are 5.1 inches for pipe to gated pipe, <br />11.2 inches for pipe to gated pipe with surge and 13.6 inches for <br />sideroll sprinkler and microspray. <br /> <br />Project goals for reduction in deep percolation are three inches for <br />surface systems and six inches for surge, sprinkler and microspray. <br /> <br />Chart 2. COMPARISON OF ALL TYPES OF IRRIGATION SYSTEMS <br /> <br />This is a comparison of <br />the eleven year period. <br />all sites for that type <br /> <br />all types of irrigation systems monitored during <br />Deep percolation values shown are averages of <br />of system without regard to individual crops. <br /> <br />This comparison shows a general downward trend from the most primitive <br />system monitored (earthen ditch to feeder ditches) to the most <br />technically advanced (surge systems, sideroll sprinklers and microspray <br />systems) . <br /> <br />Also shown are the average irrigation efficiency for each system, for <br />comparison. Irrigation efficiency is the soil moisture needed to be <br />replaced by the gross amount of water applied. <br /> <br />CHART 3. MONITORED CROP ROTATION WITH SYSTEM CHANGES <br /> <br />site #21 is the only site that has been monitored continuously during <br />the eleven year period of data gathering. This site has gone through a <br />crop rotation, three different operators and two system upgrades. <br /> <br />The baseline used for this comparison is the average deep percolation <br />for the period 1985 through 1989, of all sites monitored for five years' <br />or more. <br /> <br />This comparison showed the following results over this period. <br />Rotation <br /> <br />Baseline= 23.9 inches of deep percolation annually <br />site Av.= 16.7 inches ,of deep percolation annually <br /> 7.2 inches of deep percolation annually <br />Improved pipe to gated pipe <br />Baseline= 23.9 inches of deep percolation annually <br />PGP Av. = 21.3 inches of deep percolation annually <br /> 2.6 inches of deep percolation annually <br />Improved to surge system <br /> <br />Baseline = <br />PGS Av. = <br /> <br />23.9 inches of deep percolation annually <br />8.5 inches of deep percolation annually <br />15.4 inches of deep percolation annually <br /> <br />PGP = Pipe to gated pipe <br />PGS = pipe to gated pipe, surge <br /> <br />13 <br />