Expected Outcomes for IRWD Self-Reliance Near-term (2030) – Normal water year regional self-reliance is expected to increase by 163,987 AF from the 2010 baseline; this represents an increase of about 44 percent of 2030 normal water year retail demands (See Table B-2 ). Long-term (2045) – Normal water year regional self-reliance is expected to increase by nearly 164,634 AF from the 2010 baseline, this represents an increase of about 43 percent of 2045 normal water year retail demands (See Table B-2 ).
Water Use Efficiency
The water use efficiency information shown in Table B-2 is taken directly from Table B-1 above as per DWR Guidance and provided table formulas.
Water Recycling
The water recycling values shown in Table B-2 reflects the total recycled water production in service area as described in Section 4 of the UWMP.
Advanced Water Technologies
Currently, DWR Guidance and WR P1 leave the definition of advanced water technologies to the discretion of water suppliers. IRWD considers four potable water sources to be advanced water technologies contributing to reduced reliance on the Delta. These include its Deep Aquifer Treatment System (DATS), Wells 21 and 22 Desalter, Irvine Desalter Potable Treatment Plant (PTP), and the Baker Water Treatment Plant (Baker WTP). The DATS, Wells 21 and 22 Desalter, and Irvine Desalter PTP are all groundwater treatment facilities, which remove color tint, salts and nitrates. These facilities allow IRWD to produce additional potable water from an otherwise non-potable groundwater source. Baker WTP is an advanced surface water treatment plant that was constructed as a joint regional project that provides treated water to IRWD and four other water agencies. Baker WTP treats local surface water runoff from Irvine Lake and also raw imported water from the Colorado River system through Metropolitan. Baker WTP receives imported untreated supplies from Metropolitan’s Lake Matthews reservoir. Lake Matthews is the terminus for Metropolitan’s Colorado River Aqueduct and is only supplied with Colorado River. Therefore, no Delta water supplies are supplied to the Baker WTP. Table B-2A shows the annual estimates used in Table B-2 . The Well 21 and 22 Desalter came online after 2010 and was excluded from the baseline values in Table B-2 . Similarly, Baker was fully operational after 2015 and was excluded from both the 2010 baselines and 2015 values accordingly. All values shown in Table B-2A are based on available treatment capacities.
Appendix B - 10
IRWD – 2025 Urban Water Management Plan – Reduced Delta Reliance
Powered by FlippingBook