Service area demands, excluding non-potable demands, are divided by the service area population to get per capita water use in the service area in gallons per capita per day (GPCD) for each five-year period. The change in per capita water use from the baseline is the comparative GPCD from that five-year period compared to the 2010 baseline. Changes in per capita water use over time are then applied back to the IRWD service area population to calculate the estimated WUE Supply. This estimated WUE Supply is considered an additional supply that may be used to show reduced reliance on Delta water supplies. The estimated WUE Supply significantly increases from 2025 to 2030 due to a projected decrease in service area demands and projected increase in population.
The demand and WUE data shown in Table B-1 were collected from the following sources:
Year and Values
Data Sources
IRWD 2005 UWMP: Table 4 Table 2
Baseline 2010 values
IRWD 2010 UWMP: Table 11 (only water deliveries) Table 16 (Recycled Water Only- Produced for Demands) IRWD 2015 UWMP: DWR Table 3-1 (population actuals)
2015 values
IRWD 2015 UWMP: DWR Table 4-3 DWR Table 7-2 IRWD 2020 UWMP DWR Table 3-1 (population actuals) IRWD 2020 UWMP DWR Table 4-3B DWR Table 7-2 IRWD 2025 UWMP DWR Table 3-1 (population actuals)
2020 values
2025 values
IRWD 2025 UWMP DWR Table 4-2 DWR Table 3-1 (projections)
2030-2045 values
** Note 2015 population values come from the 2015 UWMP actuals, the values found in the UWMP were used. The 2015 actuals contain a slight error for City of Tustin serviced population values that has since been corrected by CDR in the 2020 actuals and all future forecasted projections.
Appendix B - 8
IRWD – 2025 Urban Water Management Plan – Reduced Delta Reliance
Powered by FlippingBook