Understanding Reverse Flow in Outlets in SWMM 5
In SWMM 5, outlets are designed to manage the flow of water out of the system but can also allow for unique flow dynamics under certain conditions:
- Reverse Flow Capability:
- Outlets can experience reverse flow (1) if there's a situation where the downstream head exceeds the upstream head (2). This means if the water level or pressure downstream is higher than upstream, water can flow back through the outlet in the opposite direction.
- Flap Gate Functionality:
- To control or prevent this reverse flow, SWMM 5 includes the option for a flap gate (3). When a flap gate is installed on an outlet, it will prevent flow reversal (4) by only allowing water to flow in one direction - out of the system.
- Flow Dynamics:
- Without a flap gate, an outlet can handle both positive (outflow) and negative (inflow) flow. This bidirectional capability is useful for scenarios where water levels might fluctuate,
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