Aquifer test

This is often used in geotechnical engineering settings to get a quick estimate (minutes instead of days) of the aquifer properties immediately around the well.

This decline in pressure will show up as drawdown (change in hydraulic head) in an observation well.

Other methods relax one or more of the assumptions the Theis solution is built on, and therefore they get a more flexible (and more complex) result.

Lubin), for two-dimensional radial flow to a point sink in an infinite, homogeneous aquifer.

Typically this equation is used to find the average T and S values near a pumping well, from drawdown data collected during an aquifer test.

These conditions (steady-state flow to a pumping well with no nearby boundaries) never truly occur in nature, but it can often be used as an approximation to actual conditions; the solution is derived by assuming there is a circular constant head boundary (e.g., a lake or river in full contact with the aquifer) surrounding the pumping well at a distance R. Of critical importance in both aquifer and well testing is the accurate recording of data.