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<br /> <br /> <br />W non automated systems, but offer a larger potential for <br />C) reducing on-farm salinity contributions due to increased <br />~ irrigation efficiencies. Sprinkler and trickle irri- <br />W gation systems are not competitive with head ditch <br />linings whereas automated head ditches can compete and <br />can increase the cost-effectiveness of head ditch <br />linings. Sprinkler and trickle irrigation systems <br />become feasible near the $150/metric ton value. <br /> <br />:,t <br /> <br />5) Irrigation scheduling by itself is not a significant <br />salinity control alternative, but should be part of any <br />strategy for improved water management in order to <br />maximize the effectiveness of physical improvements. <br /> <br />6) Canal linings reduce salt loading at unit costs <br />ranging from $190 to $700 per metric ton of salt <br />removed. <br /> <br />7) Desalting in conj,unction with pump drainage can be <br />expected to become feasible to reduce salt 10ading at <br />approximately $320 per metric ton. <br /> <br />8) Field relief drainage is infeasible at any cited down- <br />stream detriment figure. <br /> <br /> <br />~ <br /> <br />9) Cost-sharing programs are highly effective in attracting <br />irrigators to participate in programs for improving the <br />lateral and on-farm components of the irrigation system, <br />provided adequate technical assistance is provided. <br /> <br />10) Allowing individual irrigators to use their labor to <br />meet all or part of their matching requirements cer- <br />tainly contributed to the ease of accomplishing the <br />goals of this project. <br /> <br />11) In Grand Valley, the jurisdiction of the irrigation <br />companies does not include the laterals in most cases, <br />so there are no formal arrangements for managing the <br />irrigation water supply and settling disputes among <br />water users. <br /> <br />, "' <br /> <br />~_ ~ ~;.'L._ "" ,c"-,, <br /> <br /> <br />l2) The informal organizational arrangements used for the <br />lateral improvement program, although satisfactory on <br />most of the laterals, resulted in numerous problems on <br />a few laterals as far as collecting required matching <br />funds for the project, as well as some difficulties in <br />implementing improved irrigation practices. <br /> <br />13) Individual on-farm improvements should be the result of <br />individual negotiations between the irrigator and tech- <br />nical assistance personnel. <br /> <br />15 <br /> <br />;;.;. <br />