Which option lists water metering devices used for flow testing?

• A. Calibrated pitot tube
• B. Venturi meter
• C. Orifice
• D. All of the above

Answer: (D)

Flow testing relies on converting either velocity or a pressure drop into a flow rate, and all three devices do that in different ways. A calibrated pitot tube measures the flow velocity by comparing stagnation and static pressures in the water stream, which you can then convert to flow rate. A Venturi meter uses a constricted section to create a differential pressure; with the geometry known, you can calculate the flow accurately from that pressure drop. An orifice plate creates a fixed pressure drop across a small hole, and that drop is proportional to the flow rate, providing a simple, cost-effective measurement method. Since each of these tools is standard for assessing water flow during testing and calibration, the option that includes all of them is the best choice.