What are the approaches being considered to control CSOs at each Puget Sound beach project location?

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1. Conveyance/treatment – Sending flows from the basin to an existing treatment plant.
2. Storage – Retaining flows during large storms to prevent CSOs. Following the storm event, flows are sent for treatment. 
3. On-site treatment – Providing primary treatment for flows exceeding system capacity during large storms.
4. Peak flow reduction (demand management) – Implementing one or more methods of limiting stormwater flow into the sewer system.
5. Combination of approaches – These options can be used alone or in combination, depending on local conditions at each project location.