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The drainage channel will run along the sedimentation tank on the side of the inlet channel. The channel will allow waste water from both inlet and exit channel tanks to run out to waste. It will be fed from and an elbow connected to the inlet channel tank tee. The elbow will be rotated at 45 degrees from the base of the drain channel to minimize splashing and must allow for the exiting waste water to flow in the direction of the all drained waste water.