Wet weather tools

Storm channels at treatment plants are activated during wet weather events to split excess flows and prevent flooding of biological or advanced treatment units. Photo: Pam Broviak

Typical sewage treatment system This diagram illustrates a typical treatment process at a wastewater plant. Blending takes place when flows are intercepted after primary treatment and conveyed directly to disinfection—bypassing secondary treatment. Source: U.S. EPA

Top: Some cities have constructed storage basins to collect CSO discharges. Primary treatment and disinfection are provided for these overflow volumes and when storm events pass, the water can be conveyed to the POTW for further treatment. Bottom: This tank normally provides aeration for plant effluent. During wet weather events, automated controls empty this tank and redirect final effluent flows to another tank. Storm flows are then conveyed to this tank for primary treatment and disinfection during the storm. Photos: Pam Broviak

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