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I I I I I I I I I I I I I I I I I I I 5.3 Estimated Plan Year and Post Plan Year Replacement Requirements for Individual Wells The portion of the total wellhead depletion accruing during the 1997 plan year was estimated for each individual well by determining a lagged stream depletion function for irrigation and municipal use patterns (see Table 4) for each ditch user group or SDF value. Lagging patterns were determined by modeling hypothetical wellhead depletions and accumulating the first twelve monthly lagged stream depletions into the plan year depletion factor. The post plan year depletion factor is equal to one minus the plan year depletion factor. Table 8a shows the distribution of replacement requirements between plan year and post plan year for each use pattern (irrigation or municipal) and for each user group (Gray Area ditch assignment). Table 8b shows the same information for each use pattern and for each SDF value assigned to wells in the Blue and White Areas. Estimated annual plan year and post plan year replacement requirements for each individual well in the plan are shown in the last two columns of Appendix B. Using the factors shown in Table 8 and the total depletions shown in Appendix B, AGUA's estimated individual well post plan year replacement requirements total 2,932 acre-feet. This compares to 3,249 acre-feet of post plan year replacement requirements determined using the stream depletion models as described in Section 5.2. The estimated plan year and post plan year replacement requirements described in this section are used only for the purpose of estimated the plan year/post plan year split for each individual well. G:\3ln _OO3\REPORTS\AGUA97 _1.RPT 15 PrintedFebruary27,I997