Nonsteady state
equation (Hantush's solution) depending on time and geological
option.
Time

Option

Equation

For early
times:

1, 2


For late
times:

1


For late
times:

2


For the entire
time period

3


where
In addition,
Moench’s solutions for drawdown in the main aquifer and aquitard
are included in the program. The solutions take into account
position of the observation well within the semipervious layer
(aquitard), storage capacity of the pumping well and skin effect.
Moench’s solutions describe the entire diagnostic graph.
DP_LAQ code is
used for calculation (Moench, 1990). See:
Moench A.F.
Transient flow to a
largediameter well in an aquifer with storative semiconfining
layers // Water Resources Research. 1985. Vol. 21, N 8.
P. 1121–1131.
Methods of analysis and parameters being estimated
Plot

Method

Parameters

Comments


matching




matching




matching




matching




matching




matching




matching




matching




matching



For option 3
estimated parameters are the following:
For Moench’s
solutions it may be needed to specify such parameters as casing
radius of the pumping well, skin hydraulic conductivity and
thickness.
