Looking for a good solution for measuring the volume of overflow from a number of good old duplex lift stations. Each station has a concrete overflow pipe, probably between 8 and 12 inches. There are a lot of ideas kicking around like using the already measured analog wet well level to know when there is an overflow. That's fine but getting an accurate volume from that seems impossible. Another option being discussed is to dig down and install a flowmeter of some sort in (or on) the overflow pipe...but I am concerned that the flow will be too low to measure accurately this way. I have seen information on mounting an ultrasonic level sensor aimed at the water "trapped" behind a weir. I was thinking that this arrangement could be mounted fairly easily in the start of the overflow pipe inside the wet well. The sensor would connect to the existing RTU/SCADA equipment and would continuously monitor the liquid level behind the weir. Levels above the overflow height would be easily calculated into overflow volumes. Has anyone seen anything like this in a lift station, or done anything similar. Any other suggestions on measuring lift station overflows would be greatly appreciated.
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