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Sometimes it is necessary to shut off the flow of water into the sedimentation tank in order to clean it, make repairs or alterations, or to close it off if the plant is producing an excess of treated water. For this purpose, the inlet weir tank is needed to funnel the excess water to the waste system. The functionality of the tank allows for the sedimentation tank to be shut off, while leaving the rest of the components of the plant unaffected. The weir in front of the tank controls the height of the water in the tank. The inlet tank contains one vertical pipe which sends water to the waste channel.
The Exit Weir Tank
The exit weir tank acts as a passage to either the waste line or the distribution tank. Depending on the quality of the treated water and the functionality of the plant, one of the two passage ways is plugged to prevent the water from traveling down that pipe. The weir tank attaches to the end of the exit channel and controls works with the exit weir to control the flow to the storage tank and control the overall water level throughout the entire plant.
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The waste and distribution system consists of one pipe stemming from the inlet weir tank to a tee and two pipes coming out of the exit weir tank that each connect to elbows that oppose directionin opposite directions. The inner pipe in the exit weir tank connects to an elbow that faces the inlet weir tank. There is a pipe that connects the elbow facing the inlet weir tank to the inlet tee. This part of the system accounts for the waste passage and outputs to the drainage channel on the inlet channel side of the sedimentation tank. The outer pipe in the exit weir tank leads to an elbow that connects to the distribution tank.
The Drainage Channel
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 elbow connected to the inlet channel tank pipe.