WSbank leakage(LTCE) = [(LBase x FL) + (LBase x VL x F(LTCEBase))] x CL x EF x DF WSevaporation(LTCE) = EBase x CL x EF x DF The differences between the Phase 4 calculations and the Phase 3 calculations are the addition of the durability factor (DF) and the replacement of the deliveries ratio with F(LTCE). The revision of the Technical Manual for Version 4 has also eliminated the time factor tr from the Phase 4 calculation. The revision of the baseline year in 2011/12 adjusted the baseline year losses for leakage, seepage and evaporation losses. Seepage and evaporation losses are also now to occur over a full year rather than just the irrigation season. GMW applies the calculations on a channel by channel basis which gives a more accurate assessment of Phase 3 estimates than if the time and length factors were applied as an average across the entire irrigation area. Input Data The inputs required to calculate 3 and Phase 4 water savings due to channel rationalisation are summarised Table 62 and Table 63. The first table details the parameters that are fixed or have been previously audited, e.g. the baseline year parameters. The second table details the input data from the current year. Table 62 Fixed Parameters and Baseline Year Parameters for Channel Rationalisation Water Savings Calculation Parameter Description Source SBase Seepage in Baseline Year Baseline Year water balance LBase Leakage in Baseline Year Baseline Year water balance EBase Evaporation in Baseline Year Baseline Year water balance DBase Deliveries in Baseline Year Baseline Year water balance FL Proportion of bank leakage recognised as Technical Manual VL Proportion of bank leakage recognised as variable Technical Manual EF Effectiveness Factor for channel rationalisation Technical Manual DF Durability Factor to account for the durability of water Technical Manual savings F(LTCE) Long Term Cap Equivalent Factor to convert Current Calculated from deliveries and Year volumes to Long Term Cap Equivalent volume base figure advised by Department of Environment, Land, Water and Planning Table 63 Current Year Parameters for Channel Rationalisation Water Savings Calculation Parameter Description Source CL Ratio of GIS and length of direct spur measurement channel length rationalised
WSbank leakage(LTCE) = [(LBase x FL) + (LBase x VL x F(LTCEBase))] x CL x EF x DF WSevaporation(LTCE) = EBase x CL x EF x DF The differences between the Phase 4 calculations and the Phase 3 calculations are the addition of the durability factor (DF) and the replacement of the deliveries ratio with F(LTCE). The revision of the Technical Manual for Version 4 has also eliminated the time factor tr from the Phase 4 calculation. The revision of the baseline year in 2011/12 adjusted the baseline year losses for leakage, seepage and evaporation losses. Seepage and evaporation losses are also now to occur over a full year rather than just the irrigation season. GMW applies the calculations on a channel by channel basis which gives a more accurate assessment of Phase 3 estimates than if the time and length factors were applied as an average across the entire irrigation area. Input Data The inputs required to calculate 3 and Phase 4 water savings due to channel rationalisation are summarised Table 62 and Table 63. The first table details the parameters that are fixed or have been previously audited, e.g. the baseline year parameters. The second table details the input data from the current year. Table 62 Fixed Parameters and Baseline Year Parameters for Channel Rationalisation Water Savings Calculation Parameter Description Source SBase Seepage in Baseline Year Baseline Year water balance LBase Leakage in Baseline Year Baseline Year water balance EBase Evaporation in Baseline Year Baseline Year water balance DBase Deliveries in Baseline Year Baseline Year water balance FL Proportion of bank leakage recognised as Technical Manual VL Proportion of bank leakage recognised as variable Technical Manual EF Effectiveness Factor for channel rationalisation Technical Manual DF Durability Factor to account for the durability of water savings Technical Manual F(LTCE) Long Term Cap Equivalent Factor to convert Current Year volumes to Long Term Cap Equivalent volume Calculated from deliveries and base figure advised by Department of Environment, Land, Water and Planning Table 63 Current Year Parameters for Channel Rationalisation Water Savings Calculation Parameter Description Source CL Ratio of length of spur channel length rationalised GIS and direct measurement
Audit-of-Irrigation-Modernisation-Water-Recovery-2015-16-Irrigation-season-accessible-version.docx