The Hydrologic Impacts From the Diversion of Winter Flows of ...

Figure 12.
Theis Solution:
Theissian Conditions
An analytical solution developed by Theis has the underlying
assumptions:
1) The aquifer has a semmingly infinite areal extent
2) The aquifer is homogeneous, isotropic and of uniform
thickness over the area.
3) The piezometric surface are (nearly) horizontal over the
area
4) The aquifer is pumped at Q constant discharge rate
5) The pumped "ell penetrates the entire aquifer on
receives water from the entire thickness of the aquifer
horizontal flow.
6) The aquifer is confined
7) The flow to the well is in unsteady state
thus
by
8) The water removed from storage is discharged instantaneously
"ith the decline in head
9) The diameter of the pumped lIell is very small
10) The well is perfectly efficient
1= (jW{U)
tf-rr (Ao- h )
*, tu{u.)
~d
t5:: Lful{:
N·t
4Tf;
9~ dl%h~1.e
T-:::.
t;;
r ~
radlf/5
h() -h '" 5" d("~dvwY]