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The first step is to determine the flow rate through one sedimentation tank. The total plant flow rate (Q.Plant) is split evenly through all sedimentation tanks. The number of sedimentation tanks to be constructed is determined by the user.

After determining the flow rate of one sedimentation tank. The first step is to determine the necessary height of the port introducing water to the sedimentation tank. This port has to be designed to not breakup the flocs created in the flocculator, thus the energy dissipation of the port has to be less than that of the end of the flocculator. Determining this B.SedPort value requires an iterative process because of an interdependence between the width of the inlet slope and width of the space between ports, which is assumed to be the same as the height of the port, are interdependent.
The equations for the width of the trapezoidal inlet and the height of the port are as follows.