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<br /> -------- <br />L~ <br />C-, <br />M <br />0 <br />'~> ; TABLE 5 <br />.~ <br />-' <br /> GRAND VALLEY SALINITY PROJECT <br /> COMPARISON OF CONVENTIONAL AND SURGE IRRIGATION, 1991 <br /> site No. of Field Irr. Inflowl OutfloW2 Infilt.3 Deep4 Appl. 5 <br /> No. Irrq. Size hrs/ Perc. Eff. <br /> lac.l acre lin.l lin.l lin.l lin.l I%l <br /> 11 cony. 6/ 6 4.3 53 57.9 4.1 53.8 16.0 65.3 <br /> 39 surge 6 7.5 49 54.9 12.4 42.5 6.1 66.3 <br /> Difference 4 3.0 -8.3 11.3 9.9 +1.0 <br /> 15 cony. 6 18.9 42 69.5 24.1 45.4 23.1 32.1 <br /> 41 surge 6 16.6 27 50.2 14,8 35.4 14.5 41.6 <br /> Difference 15 19.3 9.3 10.0 8.6 +9.5 <br /> 43 cony. 77/ 2.4 97 96.9 39.5 57.4 29.0 29.3 <br /> 44 surge 7 4.8 77 81.4 25.6 55.8 28.3 33.8 <br /> Difference 20 15.5 13.9 1.6 0.7 +4.5 <br /> 26 cony. 6 19.0 30 32.5 16.3 16.2 4.1 37.1 <br /> 51 surge 6 9.6 22 22.2 9.8 12.4 2.1 46.3 <br /> Difference 12 10.3 6.5 3.8 2.0 +9.2 <br /> 49 cony. 4 8.8 37 52.6 7.1 45.5 30.9 27.8 <br /> 50 surge 4 8.8 39 55.0 9.6 45.4 30.4 27.2 <br /> Difference 2 -2.4 -2.5 0.1 0.5 -0.6 <br /> Cony. Average 52 61.9 18.2 43.7 20.6 38.3 <br /> Surge Average 43 52.7 14.4 38.3 16.3 43.0 <br /> Difference 9 9.2 3.8 5.4 4.3 +4.7 <br /> % savinqs 8/ 17 14.9 20.9 12.4 20.9 <br /> <br />11 The amount of water applied to the field in acre inches per acre. <br />21 Run-off values in acre inches per acre. A negative value indicates runoff from surge sites greater than from <br />conventional sites. <br />31 Infiltration in acre inches per acre. <br />41 Average deep percolation in acre inches per acre. <br />51 A positive value indicates surge application efficiency to be greater than conventional sites. <br />61 CompariSon sites (surge and conventional) established in the same field but different locations. <br />71 Data from five irrigations used for comparison. Conventional site had five and surge had six irrigations during <br />the season. <br />81 Percent reduction or savings in hours, water application, runoff, deep percolation etc. with use of surge <br />irrigation system compared to conventional irrigation. <br /> <br />21 <br />