What should be done if the flow rate exceeds sanitary piping capacity during storm events?

Implementing a temporary storage solution is the most appropriate action to take when the flow rate exceeds the capacity of sanitary piping during storm events. This approach allows for the management of excess water by temporarily holding it until the storm conditions subside, or until it can be safely conveyed through the sanitary system without overloading it. This helps prevent potential sewer backups, minimize the risk of sewer overflow, and protect both the infrastructure and the environment from adverse effects of flooding and contamination.

Temporary storage can involve various systems, such as retention basins, tanks, or other methods designed to hold stormwater. This strategy aligns with best management practices for stormwater management, focusing on controlling the flow of water and reducing peak discharge rates into existing sewer systems.

Choosing to increase the size of the sanitary pipes may seem like a long-term solution, but it often requires significant investment and infrastructure changes. Additionally, it may not be feasible in already developed areas where space and existing conditions impose constraints. Rerouting excess flow to ground drains or diverting water back to the site could also pose environmental and regulatory challenges and potentially lead to more harm than good. Therefore, implementing a temporary storage solution is a practical and immediate response tailored to manage unexpected stormwater surges efficiently.