Water metering is the practice of measuring water use. Water meters measure the volume of water used by residential and commercial building units that are supplied with water by a public water supply system. They are also used to determine flow through a particular portion of the system.
In most of the world water meters are calibrated in cubic metres (m3) or litres[1] but in the United States and some other countries water meters are calibrated in cubic feet (ft.3) or US gallons on a mechanical or electronic register. Modern meters typically can display rate-of-flow in addition to total volume.
Several types of water meters are in common use and may be characterized by the flow measurement method the type of end-user the required flow rates and accuracy requirements.
