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  2. Multilevel groundwater monitoring systems - Wikipedia

    en.wikipedia.org/wiki/Multilevel_groundwater...

    MLS systems facilitate 1) ongoing measurement and monitoring of depth-discrete water pressures (hydraulic heads) and 2) repeated collection of depth-discrete groundwater samples for chemical testing. Commercial MLS systems are available with as few as three ports (CMT System) to more than 20 ports (MP Westbay and Solinst Waterloo Systems).

  3. Level sensor - Wikipedia

    en.wikipedia.org/wiki/Level_sensor

    At sea level, this is about 1013 mbar - which would correspond to the pressure exerted by a water column ten meters high. In addition, a variable air pressure would affect the measurement result. Typical air pressure fluctuations of about +/- 20 mbar, corresponding to +/- 20 cmWs (water column).

  4. Water level (device) - Wikipedia

    en.wikipedia.org/wiki/Water_level_(device)

    A water level device showing both ends at the same height. A water level (Greek: Aλφαδολάστιχο or (υδροστάθμη) [Alfadolasticho]) is a siphon utilizing two or more parts of the liquid water surface to establish a local horizontal line or plane of reference.

  5. Water metering - Wikipedia

    en.wikipedia.org/wiki/Water_metering

    A typical residential water meter. 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.

  6. Stream gauge - Wikipedia

    en.wikipedia.org/wiki/Stream_gauge

    The first routine measurements of river flow in England began on the Thames and Lea in the 1880s, [2] and in Scotland on the River Garry in 1913. [3] The national gauging station network was established in its current form by the early 1970s and consists of approximately 1500 flow measurement stations supplemented by a variable number of temporary monitoring sites. [2]

  7. Sight glass - Wikipedia

    en.wikipedia.org/wiki/Sight_glass

    Water gauge on a steam locomotive. Here the water is at the “top nut”, the maximum working level. Note the patterned backplate to help reading and toughened glass shroud. A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within.

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