SLIDE 1 Summary of IRWD Basics
- Operating since 1961, serving ~370,000
- Current sources (next slide)
- State water reduction assignment = 16%
- GW use (65%) but could go higher to reduce imports
- Imported water (~35%) via MWDSC from State
Water Project and Colorado River Aqueduct
- Currently 100% (~24 mgd) of Michelson Water
Recycling Plant (wastewater) goes to non-potable use; capac. now at 28 mgd, planned for 33 mgd
- Residential per capita use fallen by 25% from 1991 to
2014
SLIDE 2
1990 2013 IRWD’s Changing Source Focus
SLIDE 3
Groundwater 48% Imported 27% Wastewater Reuse 21% Rainfall and Runoff Capture 4%
2014 - All Potable and Non-Potable Sources
SLIDE 4
Groundwater 65% Imported Surface Water 35%
2014 - Potable Sources Only
SLIDE 5 Summary of IRWD Basics
- Operating since 1961, serving ~370,000
- Current sources (next slide)
- State water reduction assignment = 16%
- GW use (65%) but could go higher to reduce imports
- Imported water (~35%) via MWDSC from State
Water Project and Colorado River Aqueduct
- Currently 100% (~24 mgd) of Michelson Water
Recycling Plant (wastewater) goes to non-potable use; capac. now at 28 mgd, planned for 33 mgd
- Residential per capita use fallen by 25% from 1991 to
2014
SLIDE 6
Focus #1 – Shift More Toward GW Source: Reliability
SLIDE 7
Focus #1 – Shift More Toward GW Source: Cost
SLIDE 8
SLIDE 9
SLIDE 10
Recommendation: Work with OCWD basin managers on shift to more GW use
SLIDE 11 Recommendation: Seek recharge
OCWD credits
SLIDE 12
Recommendation: Continue to expand treated non-potable water to meet need Focus #2 – Wastewater to Non- Potable Uses
SLIDE 13
Recommendation: Continue education effort and enforce wise use practices
SLIDE 14
Focus #3 – Potable Uses
Residential use reduction from 115 gpcd in 1990 to 86 gpcd in 2013
SLIDE 15 Recommendation:
education and incentive efforts
- Monitor results
- Use adaptive
management when needed
SLIDE 16
$$??
Recommendation: Review “allocation based conservation rate” structure
Photo from LA Times, 4/21/15
SLIDE 17
