Wedgeshaped and sloping aquifers
Test conditions for wedgeshaped aquifer:
üaquicludes
underlie and overlie the aquifer;
üwater level not
lower than the aquifer top;
üboth pumping and
observation wells are of full penetration;
üaquifer
thickness changes along the xaxis;
üaquifer
thickness exponentially decreases along the xaxis;
üaquifer is
infinite;
üdrawdown is
calculated at any distance from the pumping well in the direction
of decreasing thickness; in the direction of increasing thickness
there is a limitation for the distance such as: ratio of thickness
decrease to corresponding horizontal distance must be less than 0.2
(aquifer slope ratio less than 0.2).
Typical wedgeshaped aquifer.
Test conditions for sloping aquifer:
üaquifer is
unconfined, isotropic, sloping, underlain by either aquiclude or
aquitard, leaking during the pumping test;
üinitial water
saturated thickness of the aquifer is not variable in space;
üaquiclude and
water shed slopes are equal;
üexisting
solutions presume the aquiclude slope ratio less than 0.2;
üdrawdown in the
pumping well must not exceed one half in the aquifer initial water
saturated thickness;
üfor leaking
aquifer the aquitard storage is neglected;
üaquifer is
infinite.
a
b
Typical sloping aquifer system: a

nonleaking, b

leaking. Position of the pumping and observation wells see in the
figure above.
To be analyzed
are:
One well pumped at a constant
rate
Pumping
Recovery
One or several
wells pumped at a variable rate
Pumping
References
Hantush M.S. Flow of ground
water in sands of nonuniform thickness. Part 3. Flow to wells //
Journal of Geophysical Research. 1962. Vol. 67, N 4.
P. 1527–1534.
Hantush M.S. Hydraulics of
gravity wells in sloping sands // Journal of the Hydraulics
Division. Proceedings of the American Society of Civil Engineers.
1962. Vol. 88, N HY4. P. 1–15.
Hantush M.S. Hydraulics of
wells // Advances in Hydroscience / Edited by
Ven Te Chow. New York; London: Academic Press, 1964.
Vol. 1. P. 281–432.
