Uploaded October 2025 | Updated September 2026, 2 weeks ago
Trapped air pockets within sewer networks can lead to an array of operational and safety issues. One potential safety concern can occur during rainfall events when heavy manhole lids are displaced due to trapped air venting through the manhole opening (also known as a sewer geyser). In this FLOW-3D HYDRO example, the manhole lid is represented as a moving object with six degrees of freedom. As the air pocket works its way from the pipe to the manhole structure, the force of the air and water mixture causes the manhole lid to pop off the structure. CFD modeling can help you investigate your sewer's trapped air issues and develop mitigation strategies. Learn more at flow3d.com/hydro
Trapped air pockets within sewer networks can lead to an array of operational and safety issues. One potential safety concern can occur during rainfall events when heavy manhole lids are displaced due to trapped air venting through the manhole opening (also known as a sewer geyser). In this FLOW-3D HYDRO example, the manhole lid is represented as a moving object with six degrees of freedom. As the air pocket works its way from the pipe to the manhole structure, the force of the air and water mixture causes the manhole lid to pop off the structure. CFD modeling can help you investigate your sewer's trapped air issues and develop mitigation strategies. Learn more at flow3d.com/hydro
