The easiest and cheapest way to measure underground water level is by using a simple plunger device, often combined with a tape measure.
Here's a breakdown of the method:
Measuring Groundwater Level with a Plunger
This method involves using a weighted, hollow tube (the plunger) attached to a measuring tape to determine the distance to the water table from the top of the well casing or monitoring pipe.
Steps:
- Locate a Suitable Monitoring Well or Pipe: Access to groundwater is typically gained through a dedicated monitoring well or pipe.
- Determine the Reference Point: Measure and record the height of the top of the well casing (or pipe) relative to the ground surface. This is your reference point.
- Lower the Plunger: Carefully lower the plunger into the well using the attached measuring tape.
- Listen for the "Plop": As the plunger reaches the water table, it will make a distinct "plop" sound as the air inside the tube is displaced by the water.
- Record the Measurement: Note the reading on the measuring tape at the reference point (top of the well casing).
- Calculate the Water Level: Subtract the tape reading from the reference point height to determine the depth to the water table. For example, if the top of the casing is 1 meter above the ground and the tape reads 3 meters at the top of the casing when the plop is heard, the water level is 2 meters below the ground surface.
Advantages of the Plunger Method:
- Low Cost: Simple materials make it a budget-friendly option.
- Ease of Use: Relatively easy to operate with minimal training.
- Portability: The equipment is easily transportable.
Limitations:
- Accuracy: Not as precise as electronic methods.
- Well Condition: Requires a relatively clean and unobstructed well.
While other more sophisticated methods, such as pressure transducers or ultrasonic sensors, exist for continuous or more accurate monitoring, the plunger method offers a practical and affordable solution for basic groundwater level measurement.
