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Thanks LittleInch. It's a 2.5km long 3.4m diameter tunnel with two 1.5m risers, 6m diameter barrels and nozzle caps on each barrel. Each barrel has five 0.5m diameter nozzles to produce >5m/s velocity for diffusion. A gravity shaft drives the flow through the system. The higher the tide and...

Hi all. We operate an undersea outfall that has a 1.5m diameter riser pipe discharging by gravity vertically into a 6.0m diameter barrel with a diffuser cap on top, discharging to the ocean. The outfall capacity needs to be doubled and I have suggested installing bellmouths on top of the...