Table 8 - 3. IRWD Shortage Level and Supply Augmentation Action – Water Banking Usage
Anticipated Water Bank Usage (AFY)
IRWD WSCP Shortage Level
Access may be limited
No Shortage Identified
Level One
Shortage Warning (up to 10%)
300 to 3,000
Level Two
7,300 to 11,500
Significant Shortage (up to 20%)
Level Three
14,800 to 18,100
Severe Shortage (up to 30%)
Level Four
Severe Shortage (up to 40%) Level Five Crisis Shortage (up to 50%) Level Six Crisis Shortage (exceeding 50%)
18,100+
Table 8 - 4. IRWD Reliability and Shortage Level in Relation to Metropolitan
Regional Shortage Percentage
Retail Impact Adjustment Maximum
MWD Regional Shortage Level
IRWD Reliability
IRWD Shortage Level
Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Level 8 Level 9 Level 10
5%
2.5% 5.0% 7.5%
100%
Level 1 Level 1 Level 1 Level 1 Level 1 Level 1 Level 1 Level 1 Level 1 Level 1
10% 15% 20% 25% 30% 35% 40% 45% 50%
99% 98% 97% 96% 95% 94% 93% 92% 90%
10.0% 12.5% 15.0% 17.5% 20.0% 22.5% 25.0%
The 2025 WSCP also includes a Seismic Risk Assessment and Mitigation Plan with information on seismic risk assessments and the recommended mitigation actions for IRWD facilities. See the Seismic Risk Assessment and Mitigation Plan section in the WSCP - Appendix E for additional information.
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IRWD – 2025 Urban Water Management Plan
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