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Date ________________
Name __________________
Grader. ________________
Grade _________________

GLG 411  Problem Set 8
Image Wells and the Hvorslev Method
Required Materials:
L
Sharp Pencil
L
Calculator
Materials Provided:
L
3 sheets of 4 cycle semilog paper (or EXCEL)
Purpose:
1.0
The purpose of this lab is:
1) to calculate T and S using the Jacob timedrawdown
equation
T = 264Q/
)
h
S = 0.3Tt
o
/r
2
where:
T is in gpd/ft
S is dimentionless
Q is discharge in gpm
)
h is drawdown over 1 log cycle
t is in days
r is in feet
2) to determine distance to an image well and hydraulic
boundary using law of times:
r
i
= r
r
s
t
i
/t
r
where:
r
i
is distance to image well
r
r
is distance to real well
t
i
and t
r
are times of equal drawdown due to
image well and real well, respectively.
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Problem:
2.0
Table 1 contains drawdown data for observation wells OW1
and OW3 which are located 500ft and 750ft, respectively,
from a pumping well designated as PW1 in Meridian
Township.
Well PW1 is open to the Saginaw Formation and
was pumped during an aquifer test at a rate of 200gpm.
The
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 Fall '06
 Larson
 Logarithmic scale, Ri, Aquifer test, drawdown data, Red Cedar alluvium

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