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Recharge boundary

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Recharge boundary

Semi-infinite aquifer with recharge boundary

 

Assumptions:

general assumptions for semi-infinite aquifer;

image well is single with the rate equal in value but opposite in sign to that of the pumping well;

drawdown develops in three stages: unsteady-state, transitional (initial influence of the boundary) and steady-state.

 

Confined aquifer with one lateral recharge boundary.

a – cross-section; b – plan view.

 

Fundamental equation:

Laplace transform solution:

 

This solution is applicable in the following cases:

One well pumped at a constant rate

Pumping

Recovery test

 drawdown is measured from the beginning of the pumping test

 drawdown is measured from the beginning of the recovery test

The whole test period including pumping /injection/ and recovery stages is analyzed

Several wells pumped at a constant rate

Pumping

One well pumped at a variable rate

Pumping

Several wells with time-variable pumping rates

Pumping