Peak flow reduction (demand management) – implementing one or more methods of limiting stormwater flow into the sewer system

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Disconnecting roof drains, foundations drains and street runoff from the combined sewer; repairing leaks in the system; and installing rain gardens and bioswales can eliminate or delay peak flows into the combined system.

Key considerations

• Low-tech, “green” solutions to CSOs
• Reducing storm water flow gets at the root of the CSO problem
• Peak flows into the combined system during storms are reduced, minimizing the need for other capital improvements
• Storm water must be managed in other ways, such as bioswales
• Extensive property owner participation is essential
• Confirming sources and locations of storm water connections can be difficult
• Numerous agreements with government agencies and private property owners are required