IRWD Normal Year Projections The following DWR Table 7-2 (A and B) separately presents IRWD’s potable and non-potable supplies and demands for a normal year hydrology. The analysis includes IRWD’s supply capacities that can reasonably be relied upon to meet demands in a normal year hydrology. Due to the nature of IRWD’s water system and demands, DWR Table 7-2 B includes non-potable (untreated) and recycled water demands. IRWD’s supply totals reported in DWR Table 7-2 (A and B) are the same as reported in DWR Table 6-9. IRWD’s demand totals are the same as those reported in DWR Table 4-3.
Table 7 - 2 .A DWR Submittal Table Normal Year Supply and Demand Comparison (Potable)
DWR Table 7-2 Retail: Normal Year Supply and Use Comparison - Potable 2030 2035 2040
2045
Supply totals (autofill from Submittal Table 6-9 R) Use totals (autofill from Submittal Table 4-2 R)
104,863 104,863
104,863
104,863
53,116
53,709
54,201
54,284
Surplus/(shortfall)
51,747
51,154
50,662
50,579
Table 7 - 2.B DWR Submittal Table Normal Year Supply and Demand Comparison (Non- Potable, Includes Recycled Water Demands)
DWR Table 7-2 Retail: Normal Year Supply and Use Comparison - Non-Potable 2030 2035 2040 2045 Supply totals (autofill from Submittal Table 6-9 R) 63,140 63,140 63,140 63,140 Use totals (autofill from Submittal Table 4-2 R) 33,758 33,762 33,812 33,758 Surplus/(shortfall) 29,382 29,378 29,328 29,382 IRWD Single Dry Year Projections For demand projections over single dry and consecutive five-year drought conditions, IRWD conducted a separate assessment to identify trends in IRWD’s customer water use between 2010-2025. These trends and percentage change calculations, based on historic customer data, were used in IRWD’s reliability assessment calculations and the DRA analysis (See section 7.1.B above for the Historic Drought Analysis). IRWD’s water demands as described in Section 4 represent normal year conditions. To account for demand changes in a single dry year, IRWD utilized the results of the historic drought analysis. DWR Table 7-3 (A and B) presents IRWD’s estimated single dry supplies and demands for the 20-year planning horizon. These projections reflect IRWD’s estimated change in demands under the different projected hydrologic conditions. Based on IRWD’s analysis, the DWR Table 7-3 A shows IRWD’s single-dry year demands for potable water are increased by 5%, and the DWR Table 7-3 B shows recycled water demands are increased by 10%.
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IRWD – 2025 Urban Water Management Plan
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