Match releases to demand with daily adjustments. Account for deliveries to nearest cfs and to nearest minute. Eliminate use of all or parts of regulating reservoirs; drain at end of season. Eliminate spills, better scheduling, grouping deliveries. O&M activity: repair leaky gates, reshape canals, improve measuring devices. 5,000 ft. dike; large savings considering canal losses (5' evap., 1.8' seepage). Use for Lahontan spill capture only; restore 200 ft. of E-Canal; A-Canal is OK. 12,000 12. Line 20 miles of Truckee Canal 5 20,000 16. Ditch rider training each year 17. Canal automation 18. Community rotation system 19. Reclamation Reform Act water conservation ?? 24. Acquire parcels with inefficient delivery® 1,065 22,280 Incurs administrative costs to implement. For District personnel and/or water users. At the end of each irrigation season. Acquire and retire water rights from irrigated acreage with particularly inefficient delivery. Lesser 1The first seven measures were considered in developing the water budget in Table 1 for the 1988 OCAP. Additional measures could be implemented by the District to help achieve effi- 2 Water savings have been updated in accordance with Bureau of Reclamation's Report to Congress on Newlands Project Efficiency, April 1994. 3 ++ indicates a positive number for savings but not quantifiable at this time. 4?? indicates uncertainty as to savings. 5 This measure was included in the 1988 OCAP and effects overall Project efficiency; it is recognized that savings from this measure are not accounted for in the OCAP. * Identified in the 1994 BOR Efficiency Study: 31 Corporation, below Sagouspe Dam, and N Canal. (5) The measures in paragraph (c)(4) of this section are discretionary choices for the District. The range of measures available to the District provides a level of assurance that the target efficiency is reasonably achievable. The resultant efficiency targets were also compared to the range of efficiencies actually experienced by other irrigation systems that were considered comparable in order to provide a further check on "reasonable." Most of the delivery losses are relatively constant regardless of the amount of deliveries. The efficiency will necessarily vary with the amount of headgate deliveries. (6) The target efficiency for any annual valid headgate delivery can be derived from the table in Appendix A to this part. § 418.13 Maximum allowable limits. (a) Maximum allowable diversions. (1) A provisional water budget in the Newlands Project Water Budget table must be recalculated for each irrigation season to reflect anticipated water-righted acres to be irrigated. At the start of the irrigation season, the maximum allowable diversion (MAD) for each year must be determined by revising the first 10 lines of the Newlands Project Water Budget table based on acres of eligible land anticipated to actually be irrigated in that year (§418.9(a)) and the water duties for those lands (§ 418.10 ). At the end of the irrigation season, the required target efficiency must be recalculated for the irrigation season based on the actual irrigated acres and percent use headgate entitlements. of 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. All values are in acre-feet except where noted. The first 3 columns of numbers come from the 1988 OCAP, Table 1. In deriving the 1988 OCAP water budget, it was recognized that the District had reduced losses by 7,400 acre-feet prior Maximum Headgate Entitlement (line 2) plus Total Losses (line 8). Maximum Headgate Entitlement (line 2) divided by Maximum Allowable Diversion (line 9) multiplied by 100. Unused Water (line 11) plus a proportional share of Operational Loss (line 7). Maximum Allowable Diversion (line 9) minus Diversion Reduction (line 12). Maximum Headgate Entitlement (line 2) minus Unused Water (line 11) divided by Expected Irrigation Diversion (line Expected efficiency at 93.4 percent use of headgate entitlement; other entries based on 90 percent. (2) The MAD will be calculated annually to ensure an adequate water supply for all water right holders whose water use complies with their decreed entitlement and this part. The MAD is the maximum amount of water permitted to be diverted for irrigation use on the Project in that year. It is calculated to ensure full entitlements can be provided, but is expected to significantly exceed Project requirements. The MAD will be established by the Bureau at least 2 weeks before the start of each irrigation season. All releases of water from Lahontan Reservoir and di versions from the Truckee Canal (including any diversions from the Truckee Canal to Rock Dam Ditch) must be charged to the MAD except as provided in §§ 418.23 and 418.35 of this part. (3) On the basis of the methodology adopted in this part (i.e., actual irrigated acres multiplied by appropriate water duties divided by established project efficiency) an example of the MAD calculated for the projected irrigated acreage as shown in the Newlands Project Water Budget table would be 308,319 acre-feet for the 1995 Example. The sample MAD corresponds 179-171 0—98——18 to a system efficiency for full deliveries at 66.9 percent for 1995 actual acres. Target efficiencies must be based on the percentage of maximum headgate entitlement delivered and not on the percent of water supply available. (4) The table Expected Project Distribution System Efficiency shows the target efficiencies which will be used over the range of irrigated acreage and percent use of entitlement expected in the future. At the beginning of the irrigation season, the target efficiencies from the Expected Project Distribution System Efficiency table used to calculate the MAD will be based on the expected irrigated acreage and expected percent use of entitlement. At the end of the irrigation season, the actual acreage irrigated and actual percent use of entitlement will be used to determine the required efficiency from the Expected Project Distribution System Efficiency. The target efficiencies are read directly from the table if the acreage and use of entitlement values are shown, otherwise the target efficiency must be extrapolated from the table or calculated using the Efficiency Equation. Appendix A of this part shows the calculations used to derive the Efficiency Equation and the efficiency targets. |