How is the velocity of underground water measured?

Question

Quizplus · Accepted Answer

Injecting and tracking a tracer chemical at different points is the most common method of measuring the velocity of underground water. As the tracer moves through the water, its progress can be traced and the velocity can be calculated. Other methods, such as seismic readouts and tracking a radioactive tracer, may also be used but are less common. A hydrometer is not typically used for measuring velocity of underground water.

How Is the Velocity of Underground Water Measured