An easy method is proposed to determine the necessary volume of a vortex separator in comparison to that of a first-flush CSO tank. The method is based on a simplified hydrological approach as well as on steady-flow efficiency data of the vortex separator which are derived from model tests. Transfer to prototype scale is done using efficiency measurements at a real separator. The method works with a balance of spilled COD loads and yields typically separator volumes of 50-70% of that of a conventional CSO tank.

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