Measurement of groundwater levels

Asked by: Cindy Rogers

Groundwater level measurement is mostly performed by a submersible pressure transmitter. These hydrostatic level transmitters are small in diameter and directly suspended by their cable into the well, borehole, deep bore well or monitoring well.

How is water level measured?

Air lines measure water levels by first measuring the pressure of water above the air line opening. You can then convert the pressure measurement to feet of water above the airline. The gauge on an air line displays readings as either pounds per square inch (psi) or feet of water.

How is groundwater level measured India?

The hydrostatic transmitter is installed in bore-well to measure the water level. The system logs the real-time level of water and displays it locally. It also transmits the logged data to five authorized persons and to a remote indicator in Nagpur through the GSM network.

What are the methods of level measurement?

Generally, you will choose among six methods for measuring and monitoring fluid levels, each with advantages and disadvantages:

• Continuous float level transmitters.
• Differential pressure transmitters.
• Load cells.
• Radar level transmitters.
• Radio Frequency (RF capacitive level transmitters)
• Ultrasonic level transmitter.

What are the methods used for level measurement?

Two methods used to measure level; Direct or Mechanical method, and. Indirect or Inferential methods.

How is groundwater level calculated?

The elevation of the groundwater surface then can be calculated by subtracting the depth to groundwater from the ground surface elevation. Then, comparisons of groundwater elevations can be made between monitoring well locations and the direction and gradient of groundwater flow can be determined.

What is groundwater level?

Groundwater level is a term that is used in a relatively loose way, normally referring to the level, either below ground or above ordnance datum, at which soil or rock is saturated. This is also referred to as the water table and represents the top of the saturated zone. Above the water table lies the unsaturated zone.

How do you find the depth and location of groundwater?

The most reliable method of obtaining the depth to the water table at any given time is to measure the water level in a shallow well with a tape. If no wells are available, surface geophysical methods can sometimes be used, depending on surface accessibility for placing electric or acoustic probes.

What are the two types of level measurement?

Level measurements are classified into two types– direct and indirect level measurements or performed by contact or non-contact transmitters. Direct level measurements are considered ideal for small level changes, which are observed in various industrial tanks.

Which device is used for level measurement?

1. Glass Level Gauge. Available in a variety of designs, both armored and unprotected, glass gauges have been used for over 200 years as a simple method to measure liquid level.

What are the four types of level measuring instruments?

Following are the most common Continuous Level Technology used in the Industry:

• Laser.
• Ultrasonic.
• Magnetostrictive.
• Guided Wave Radar.
• Magnetic Level Gage.
• Differential Pressure.

How do you calculate volume of groundwater?

Volume = area x depth.

What is the name of the device used to measure water table levels?

Sounders. Electric water level meters – referred to as sounders – are frequently used in groundwater to measure level. These instruments are essentially tape measures with a probe on the end.

How is well depth measured?

Measuring Groundwater with Steel Tape

How do I measure the water level in my tank?

Measure the position of a float on the surface of the water. Weigh the water and calculate the volume. Bounce a sonar or radar ping off the surface of the water and measure its echo timing to detemine the height of water. Thump the water tank and measure the frequency at which it rings.

How accurate is a water level?

Percentage of Current in Water Level Measurement



Ultrasonic sensors use sound waves to bounce off the surface of the liquid to tell you how much there is in the tank. These liquid level sensors can have a resolution as high as 0.1 in. (2.5mm) and an accuracy of 0.25% of the detected range (current reading).

What is the instrument used in measuring water?

hydrometer, device for measuring some characteristics of a liquid, such as its density (weight per unit volume) or specific gravity (weight per unit volume compared with water).

What instrument is used to measure the depth of water?

echo sounder

depth finder, also called echo sounder, device used on ships to determine the depth of water by measuring the time it takes a sound (sonic pulse) produced just below the water surface to return, or echo, from the bottom of the body of water.

How do you measure depth?

Quote from video: What these dimensions actually are depth is the distance between the front of the object. And the back of the object.

What is the unit of depth?

Option B, ‘Fathoms’ is a unit of measurement used for measuring the depth of the water. One fathom is equal to six feet or 1.83 metres or 2 yards or 72 inches.