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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Revenues for LA WMA are variable under this allocative method. In a normal year, <br />revenues are $400,000 from irrigators based on current water pumping rates. In a 2nd dry <br />year, revenues decrease to $351,000. <br /> <br />In sununary, the relative (normal-year) supply method is the simplest and most direct <br />method for LA WMA to adopt for dry years. This method results in an equalization of <br />curtailment across all groups. The method has two limitations: 1) it might not be <br />perceived as fair by supplemental users in that their demand shortfall is high compared to <br />other groups~ and 2) revenues can vary by as much as 14%. The next suggested allocative <br />method directly addresses the fairness issue by basing the allocation of water not on what <br />was done lDlder normal (or historical) conditions but, rather, on how relative needs <br />change from year to year. <br /> <br />Current Organization: Relative (Current- Year) Demand Allocation Method <br />(C2) <br /> <br />Under this allocation method the available water supply in any year is allocated to a user <br />group based on that group's share of the projected total demand in that year. Demands <br />are based on historical use for each year type (e.g., normal vs. dry). The resulting set of <br />water-allocation factors will not be fIXed through all years (as was the case in CI) but, <br />rather, will vary across normal and dry years. A result of the C2 allocation method is that <br />the demand shortfall in any given year is equalized across all user groups. <br /> <br />Table 1 shows that in a dry year total replacement demand equals 24,435 af Of this total, <br />supplemental users desire 14,090 af of replacement water (in order to meet their desired <br />plUTIping level of 74,949 af)~ therefore, supplemental user's replacement demand is <br />57.63% oftotal replacement demand. Replacement demand for sole-source flood and <br />sole-source sprinkler water users is 14.38% and 27.72% respectively of the total dry-year <br />replacement demand. These percentages are the groups' water-allocation factors to be <br />applied to available dry-year water supplies. In a dry year (be it a 1 st or 2nd dry year) <br />each group is allocated a level of replacement water equal to their relative dry-year <br />replacement demand (i.e., their dry-year water-allocation factor) multiplied by the total <br />available replacement supply in that year. <br /> <br />For example, in a 1st dry year Table 4 shows that the available replacement water supply <br />(including water from storage) is 19,111 af Given that supplement user's relative (dry- <br />year) replacement demand is 57.63%, these users are allocated 57.63% of this available <br />supply or 11,020 af. (See the "replacement supplied af7yr, " row under the "dry year" <br />heading in Table 4). By analogous calculations, sole-source flood, sole-source sprinkler <br />and tributary users are allocated 2,749 af, 5,297 and 44 afrespectively. All groups face a <br />demand shortfall in a dry year equal to 21. 79% (demand shortfall is equalized). <br /> <br />In a 2nd dry year the same dry-year water-allocation factors are applied to the (lower) <br />total available replacement supply of 15,000 af Consequently, supplemental users <br />receive 8,650 af of replacement water (again 57.63% of the total) while sole-source flood <br />water users <br /> <br />EnWater Resource Consultants September 5, 1997 Final Report <br /> <br />26 <br />