SD1 began implementing projects recommended in the original Watershed Plan in 2005. Since then, SD1 has eliminated approximately 357 million gallons of typical-year CSO discharges and approximately 127 million gallons of typical-year SSO volume to date.
SD1 now begins the first phase of its Clean H2O40 sewer overflow mitigation program under the Amended Consent Decree. We must eliminate at least 20 percent of baseline typical-year SSOs and recapture at least 67 percent of typical-year CSOs by July 1, 2023.
High-impact early projects include river-water intrusion mitigation and surface stormwater detention basins to slowly release flow back into the system during heavy rainfalls, followed by state-of-the-art coordinated control schemes that cost-effectively maximize the performance of existing and future infrastructure.
Improvements are sequenced to meet the Amended Consent Decree 2023, 2029, 2034 and 2040 milestone requirements.