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<br />. <br /> <br />U-IQr~~ <br />QV...., <br /> <br />ALTERNATIVE RECHARGE PLANS FOR THE TOTAL STUDY AREA <br /> <br />. <br /> <br />Three schemes to convey water to the recharge areas have been <br /> <br /> <br />considered. Each s~heme requires a series of shallow infiltration <br /> <br /> <br />ponds.' All infiltration ponds are considered as 'new facilities. Originally, <br /> <br /> <br />the existing conveyance facilities were assumed to be diverting at <br /> <br /> <br />capacity during the irrigation season. This led to the development of <br /> <br /> <br />the first alternative which consists of an entirely new system of <br /> <br /> <br />diversion structures, canals, and recharge ponds. This scheme mini- <br /> <br /> <br />mizes drain-out losses and river diversion requirements by recharging <br /> <br /> <br />as far away from the river as possible. After review of diversion data, <br /> <br /> <br />it became evident that the existing conveyance facilities were not <br /> <br /> <br />diverting to capacity during the entire irrigation season. Therefore, <br /> <br /> <br />the possibility of using the existing conveyance system to get the water <br /> <br /> <br />to the recharge areas was considered. Further study indicated that <br /> <br /> <br />excesS canal capacity in some of the existing canals did not exist <br /> <br /> <br />when the water supply was available. This led to the formulation of a <br /> <br /> <br />third alternative consisting of a combination of new and existing <br /> <br /> <br />conveyance facilities. <br /> <br />d <br /> <br />The combination system uses existing conveyance facilities in test <br /> <br /> <br />areas I, II, and III, and uses new canals for the remainder of the study <br /> <br /> <br />area. These areas were selected because they lie at sufficient distances <br /> <br /> <br />from the river so that drain-out from year to year is anticipated to be <br /> <br /> <br />low and carryover storage is expected. It appears that existing canals <br /> <br /> <br />in these areas do have sufficient unused capacity during the early part of <br /> <br /> <br />the irrigation season to be used in this manner. Therefore, the combina- <br /> <br /> <br />tion system of new and existing conveyance facilities forms the basis of <br /> <br /> <br />the economic evaluation. <br /> <br />. <br />