Two-layer aquifer system
Assumptions:
✓aquifer system consists of isotropic aquifer over- or underlain by aquitard;
✓main aquifer contains the pumping well;
✓adjacent aquifers occur on top (overlying) or bottom (underlying) of the aquifer system, the overlying aquifer being confined or unconfined;
✓boundary: aquifer system is of infinite lateral extent;
✓pumping well is fully penetrating located in the main aquifer;
✓drawdown is calculated at any distance from the pumping well in the main aquifer, and for Moench’s solutions – in aquitards also;
✓crossflow in aquitards is vertical;
✓storage in aquitards is included.
Three geological options are considered:
option 1: aquifer system is over- or underlain by aquifer with constant water levels (a – c);
option 2: aquifer system is over- and underlain by aquicludes (d, e);
option 3: aquitard in the top (or in the bottom) of the aquifer system is of infinite thickness (f).
a 
b 
c 
d 
e 
f 
Conceptual schemes of leaky aquifer system (two-layer aquifer system) with account for storage of the aquitard.
Cross section of a leaky aquifer system (two-layer aquifer system) with account for aquitard storage capacity for Moench’s solutions. All cases of aquifer/aquitard position described above are available.
To be analyzed are:
One well pumped at a constant rate
Pumping
Recovery
One or several wells pumped at a variable rate
Pumping