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<br />0> <br />.) <br />~ <br />\.:J 2 <br />N <br />N 3 <br /> 4 <br /> 5 <br /> 6 <br /> 7 <br /> 8 <br /> 9 <br /> 10 <br /> 11 <br /> 12 <br /> 13 <br /> 14 <br /> 15 <br /> 16 <br /> 17 <br /> 18 <br /> 19 <br /> 20 <br /> 21 <br /> 22 <br /> <br />PLAN FORMULATI ON <br /> <br />Plan formulation was oriented toward the primary objective of reducing <br /> <br />the salt load from the irrigated area by improving irrigation efficiency <br /> <br />and improving watershed condition in the diffuse area. Seepage losses <br /> <br />from unlined farm delivery and tailwater pickup ditches and deep perco- <br /> <br />lation from field irrigation were considered to be the major sources of <br /> <br />water that carries salt to the river. Therefore, providing more effective <br /> <br />and efficient irrigation is the objective of the on-farm improvement <br /> <br />program. To achieve this objective, improvements in the irrigation <br /> <br />system and management practices are needed. System improvements for the <br /> <br />four alternatives are shown in Table 6. <br /> <br />The following preliminary analyses of the potential to improve Irrigation <br /> <br />efficiency are based on an extrapolation of a sample evaluation to the <br /> <br />entire basin. In this section is a discussion of four alternative <br /> <br />improvement levels. Alternative Four is the tentatively recommended plan <br /> <br />subject to discussion with the local people and can be used for evaluation <br /> <br />at this time. A summary of present system improvements for the valley <br /> <br />will be available for the final USDA report when field information has <br /> <br />been evaluated. This draft report does not include a recommended plan <br /> <br />as analysis of basic field ~ata has just been initiated and alternative <br /> <br />improvement levels have not been discussed with the local people so they <br /> <br />can indicate a preference. <br /> <br />23 'Physical irrigation system improvements consist of en ditch lining or <br /> <br /> <br />24 pipel ines to reduce seepage losses, (2) water measuring and control <br /> <br />33 <br /> <br />J <br /> <br />