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I I I I I I I I I I I I I I I I I I I CHAPTER (V PLAN ELEMENTS Section 1: Methods and Assumptions Plan formulation consists of developing a range of alternatives to alleviate identified problems and to meet identified needs. A range of alternatives was developed because there were few, if any, circumstances in which water problems and needs could be dealt with in one way only. In this chapter, the elements used in plan formulation (such as reservoirs and canals) are presented and discussed prior to the formulation of plans in Chapter V. Basic elements include: o Management Measures o Stor age Reservoirs o Transbasin Diversion The previous chapters have shown that scarcity of water for irrigating crops, orchards and pastures is a problem in the Tongue Creek basin, especially in the second half of the crop growing season and particularly for junior water rights. While the scarcity of water is the basic problem, it clearly follows that the fundamental needs, with respect to irrigation in the study area, are more effective use of existing water supplies and increasing the supply of water. Effective use of existing water supplies primarily implies non-structural measures, such as better on-farm water management or more efficient operation of existing storage and distribution systems. However, some minor structural measures, such as rehabilitation and improvement of conveyance channels or repair of water control structures, could result in more effective use. Due to the reconnaissance level of the present study, these potential measures were not analyzed here. However, if further studies are conducted, evaluation of such potential measures should be evaluated. Increasing the supply of water when it is needed implies expanding the total capacity within the basin for water storage. This can be accomplished by enlarging IV-l