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2. Acoustic Doppler current profiler - Wikipedia

   en.wikipedia.org/wiki/Acoustic_Doppler_Current...

   This feature is referred to as bottom-track. The process has two parts; first identify the position of the bottom from the acoustic echo, then calculating the velocity from a window centered around the bottom position. When an ADCP is mounted on a moving ship, the bottom track velocity may be subtracted from the measured water velocity.

3. Water metering - Wikipedia

   en.wikipedia.org/wiki/Water_metering

   A velocity water meter Internal structure of a velocity water meter. A velocity-type meter measures the velocity of flow through a meter of known internal capacity. The speed of the flow can then be converted into a volume of flow to determine the usage. There are several types of meters that measure water flow velocity, including jet meters ...

4. Current meter - Wikipedia

   en.wikipedia.org/wiki/Current_meter

   Travel time instruments determine water velocity by at least two acoustic signals, one up stream and one down stream. By precisely measuring the time to travel from the emitter to the receiver, in both directions, the average water speed can be determined between the two points.

5. Flow measurement - Wikipedia

   en.wikipedia.org/wiki/Flow_measurement

   Because they are used for domestic water measurement, piston meters, also known as rotary piston or semi-positive displacement meters, are the most common flow measurement devices in the UK and are used for almost all meter sizes up to and including 40 mm (1 + 1 ⁄ 2 in). The piston meter operates on the principle of a piston rotating within a ...

6. Amazon says these are the top 100 Cyber Monday deals ... - AOL

   www.aol.com/lifestyle/amazon-says-these-are-the...

   It's on sale for $130 and provides a reading experience similar to paperback books. When it comes to Cyber Monday deals under $100, Amazon's got the market covered there, too.

7. Rotor current meter - Wikipedia

   en.wikipedia.org/wiki/Rotor_current_meter

   Rotor current meter RCM 8 with red vane and Savonius-rotor. A rotor current meter (RCM) is a mechanical current meter , an oceanographic device deployed within an oceanographic mooring measuring the flow within the world oceans to learn more about ocean currents .