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| How can I measure the effluent from my plant, which flows by gravity to a lagoon through a pipe that is not full? |
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| There are two ways to measure gravity flows in partially full pipe. The most common is with an Open-Channel Flowmeter (OCF). This meter requires a primary measuring device such as a flume or weir. The OCF is essentially a level device that calculates flows based on the characteristics of a particular flume or weir configuration. If you already have a standard flume or weir on your pipeline the OCF is the best choice, otherwise you will have to consider the cost of installing such a primary device. |
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| The other option is the Area Velocity Meter or AVM that is newer technology and gaining popularity. The AVM has a sensor unit that installs in the pipeline (6" or larger) and calculates flow by determining the depth and the velocity of the water in the pipe along with the area of the pipe cross-section. The advantage of the AVM is that no primary device, flume or weir, is required. |
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| There are other pros and cons to each type of flowmeter, so evaluate your system and ask questions before purchasing. |
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