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MAY 1982 timing devices for salinity control, although encouraged by SCS, is optional, available to those who may want them but not required for participation in the program. The third solution considered the effect of combining irrigation water management with ditch lining. Sprinkler irrigation systems are included as a feature of irrigation water management because a higher degree of management is more likely to be achieved with sprinklers than by controlling time of set and flow rate used with existing surface systems and methods. Pipelines are needed in all off-farm group ditches leading from the Montezuma Valley Irrigation System to preserve as much gravity pressure as possible for sprinkler operation. Only part of the irrigated land can be served by gravity pressure, therefore, pumped pressure will be needed to operate sprinklers in the remainder of the area. Six alternative plans that satisfy the plan formulation objectives are displayed in Table V-I and are the candidate plans presented for further consideration by the local people and others who share responsibility for selecting the recommended plan. The acreage identified for treatment under each alternative plan depends on the proposed improvement. Classification of irrigated land by type of improvement is shown in Table V-2. The classification, based on local judgement, suggests that some landowners desire to change from present surface systems to sprinkler irrigation expecially where qravity pressure can be developed. Some may choose only to improve their present surface system and some may choose not to improve any of their system. The table also shows that assistance may not be made available to improve some existing surface systems because the land slope is too steep for irrigation without causing erosion. However, these steeper lands may be irrigated safely using properly designed and operated sprinkler systems. V-4 C:1878