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The drain channel is a concrete channel built to handle the flow of unsafe water to waste. The channel is positioned along the inlet channel side of the plant.

The purpose of this program is to design the dimensions of the drain channel is to handle all of the flow based on the height of the plant water in the event that the entire plant is filled to capacity with water in all components. In this case, if the plant needs to be drained, all the valves in the sedimentation tank and flocculator empty into the drain channel. , length of the plant, and assumptions regarding desired drainage time and basic tank geometry. The Drain Channel is constructed as a separate channel built along the side of the flocculator and the sedimentation tank on the inlet channel side. The channel will have its highest elevation near the bottom of the sedimentation tank extending in the ground. Drain valves will open the flow of water into the channel from flocculation and sedimentation tanks.

The Drain Channel must be built to accommodate the maximum flow through all the drain valves of the flocculation tank and sedimentation tank. This is calculated as:There is a flow rate constraint on the design of the drain channel. The channel must be designed so that it can handle a maximum flow rate equal to the sum of the flow rates out of the drain valves in the sedimentation tanks and the flocculator.

Q_DChannel=ΣQ_SedValves+ΣQ_FlocValves

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