24 Hour pumping test of production well 905-120P Page: 8 of 21
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conducted and the aquifer conditions, transmissivity and storage
properties are calculated.
Aquifer Unit IA, in which both the pumping well and the
observation wells are screened, is considered a leaky artesian
aquifer with no storage in the confining layer. For the analysis of
semiconfined conditions, GWAP utilizes leaky aquifer type curves
taken from Hantush (1956).
The equations used to generate the solution for transmissivity and
storage coefficient are as follows:
T = QW(u.r/B)
4ns
S = 4uTt
r2
where:
r Distance from pumped well to observation well
(584')
Q Pumping rate (755.6 gpm)
t Time since pumping began
T Transmissivity
S Storage coefficient
W(u,r/B) Leaky well function
B Leakage factor
b' Thickness of semiconfining layer (50')
K' Vertical hydraulic conductivity of leaky layer4
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Bledsoe, H. W. 24 Hour pumping test of production well 905-120P, report, December 1, 1990; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1311402/m1/8/?rotate=90: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.