5.1 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.A community is installing a new well in a
regionally confined aquifer with a transmissivity of 1589 ft
2/day
and a storativity of 0.0005. The planned pumping rate is 325 gal/min.
There are several nearby wells tapping the same aquifer, and the project
manager needs to know if the new well will cause significant
interference with these wells. Compute the theoretical drawdown caused
by the new well after 30 days of continuous pumping at the following
distances: 50, 150, 250, 500, 1000, 3000, 6000, and 10,000 ft. (This
problem and the following problem can readily be solved using Excel with
the algorithm that is suggested in Analysis K. The repetitive nature of
the calculations is especially suited to a spreadsheet solution.)
Get solution 5.2 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.A well that is screened in a confined aquifer is
to be pumped at a rate of 165,000 ft
3/d for 30
d. If the aquifer transmissivity is 5320 ft
2/day, and the storativity is 0.0007, what is the drawdown at distances of 50, 150, 250, 500, 1000, 3000, 5000, and 10,000 ft?
Get solution 5.3 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although
this process is laborious. Type curves have been published for a number
of aquifer tests on confined aquifers. The curves were derived by,
among others, the Theis method, the two methods for leaky artesian
aquifers given in this chapter, and the Cooper-Bredehoeft- Papadopulos
method. (J. E. Reed, “Type Curves for Selected Problems of Flow to Wells
in Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.Plot the distance-drawdown data from Problem 1 on
semilog paper (or on Excel).
Get solution 5.4 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology from their Prentice-Hall representative. Type curves for these problems are contained therein.If
the pumping well from Problem 1 has a radius of 1 ft, and the observed
drawdown in the pumping well is 87 ft, what is the efficiency of the
well?
Get solution 5.5 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.Plot the distance-drawdown data from Problem 2 on
semilog paper (or on Excel).
Get solution 5.6 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology from their Prentice-Hall representative. Type curves for these problems are contained therein.If
the pumping well has a radius of 1 ft, and the observed drawdown in the
pumping well is 64 ft, what is the efficiency of the well?
Get solution 5.7 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology from their Prentice-Hall representative. Type curves for these problems are contained therein.If
the aquifer in Problem 1 is not fully confined, but is overlain by a
13.7-ft-thick confining layer with a vertical hydraulic conductivity of
0.13 ft/d and no storativity, what would be the drawdown values after 30
days of pumping at 325 gal/min at the indicated distances?
Get solution 5.8 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology from their Prentice-Hall representative. Type curves for these problems are contained therein.If
the aquifer described in Problem 2 is not fully confined, but is
overlain by a 8.0-ft-thick leaky, confining layer with a vertical
hydraulic conductivity of 0.034 ft/d, what would be the drawdown values
after 30 days of pumping at 165,000 ft
3/d at the indicated distances?
Get solution 5.9 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology from their Prentice-Hall representative. Type curves for these problems are contained therein.With
reference to the well and aquifer system in Problem 1, compute the
drawdown at a distance of 250 ft at the following times: 1, 2, 5, 10,
15, 30, and 60 min; 2, 5, and 12 h; and 1, 5, 10, 20, and 30 d.
Get solution 5.10 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although
this process is laborious. Type curves have been published for a number
of aquifer tests on confined aquifers. The curves were derived by,
among others, the Theis method, the two methods for leaky artesian
aquifers given in this chapter, and the Cooper-Bredehoeft- Papadopulos
method. (J. E. Reed, “Type Curves for Selected Problems of Flow to Wells
in Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology from their Prentice-Hall representative. Type curves for these problems are contained therein.With
reference to the well and aquifer system in Problem 8, compute the
drawdown at a distance of 100 ft from the well at the following times:
1, 2, 5,10, 15, 30, and 60 min; 2, 5, and 12 h; and 1, 5, 10, 20, and 30
d.
Get solution 5.11 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.Plot the time-drawdown data from Problem 9 on
semilog paper.
Get solution 5.12 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.Plot the time-drawdown data from Problem 10 on
semilog paper. How is this plot different from that of Problem 11?
Get solution 5.13 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.A well that pumps at a constant rate of 78,000 ft
3/d
has achieved equilibrium so that there is no change in the drawdown
with time. (The cone of depression has expanded to include a recharge
zone equal to the amount of water being pumped.) The well taps a
confined aquifer that is 18 ft thick. An observation well 125 ft away
has a head of 277 ft above sea level; another observation well 385 ft
away has a head of 291 ft. Compute the value of aquifer transmissivity
using the Thiem equation.
Get solution 5.14 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.A well that pumps at a constant rate of 78,000 ft
3/d
has achieved equilibrium so that there is no change in the drawdown
with time. (The cone of depression has expanded to include a recharge
zone equal to the amount of water being pumped.) The well taps an
unconfined aquifer that consists of sand overlying impermeable bedrock
at an elevation of 260 ft above sea level. An observation well 125 ft
away has a head of 277 ft above sea level; another observation well 385
ft away has a head of 291 ft. Compute the value of hydraulic
conductivity using the Thiem equation.
Get solution 5.15 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology from their Prentice-Hall representative. Type curves for these problems are contained therein.A
slug test was performed on a monitoring well with a radius of 2 in. and
a sand pack radius of 5 in. The aquifer thickness was 8 ft and the
initial height of the water column in the casing above the top of the
screen was 51 ft. The following data showing the change in the elevation
of the water in the casing with time were collected following the
lowering of a solid slug into the water. Find the aquifer transmissivity
of you assume a storativity of 0.001....
Get solution 5.16 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.The
following data are from a pumping test where a well was pumped at a
rate of 200 gal per minute. Drawdown as shown was measured in an
observation well 250 ft away from the pumped well. The geologist’s log
of the well is as follows:......A steel well casing was cemented to a
depth of 182 ft and the well was extended as an open boring past that
point.
(A)
Plot the time-drawdown data on 3 × 5 cycle logarithmic paper. Use the
Theis type curve to find the aquifer transmissivity and storativity.
Compute the average hydraulic conductivity.(B) Replot the data on
four-cycle semilogarithmic paper. Use the Cooper-Jacob straight-line
method to find the aquifer transmissivity and storativity.
Get solution 5.17 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.A test well was drilled to a total depth of 117
ft with the following geologist’s log:...The
depth to water was 55 ft. The test well was screened from 82 to 117 ft.
It was pumped at a rate of 560 gal/min. Drawdown was measured in an
observation well that was also screened from 82 to 117 ft and was
located 82 ft away from the pumping well. The following time-drawdown
data were obtained:...
(A)
Plot the time-drawdown data on 3 × 5 cycle logarithmic paper. Compute
the value of the storativity and transmissivity of the aquifer using the
graphical method for leaky aquifers. Find the vertical hydraulic
conductivity of the confining layer.(B) Compute the value of aquifer
storativity and transmissivity of the aquifer using the Hantush
inflection-point method.
Get solution 5.18 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.A slug test was made with a piezometer that had a
casing radius of 2.54 cm and a screen of radius 2.54 cm. A slug of 4000
cm
3
of water was injected; this raised the water level by 197.3 cm. The
well completely penetrated a confined stratum that was 2.3 m thick. The
decline in head with time is given in the following chart:...Plot
the data on semilogarithmic paper and find the aquifer transmissivity
and storativity using the Cooper-Bredehoeft-Papadopulos method.
Get solution 5.19 Type curves
will be necessary for the solution of many of these problems. Type
curves can be constructed from the data in the appendices, although this
process is laborious. Type curves have been published for a number of
aquifer tests on confined aquifers. The curves were derived by, among
others, the Theis method, the two methods for leaky artesian aquifers
given in this chapter, and the Cooper-Bredehoeft- Papadopulos method.
(J. E. Reed, “Type Curves for Selected Problems of Flow to Wells in
Confined Aquifers,” in
Techniques of Water-Resources Investigations of the United States Geological Survey,
Book 3, Chapter B3, 1980. This is available from the U.S. Government
Printing Office, Washington, D.C., or Scientific Publications Company,
P.O. Box 23041, Washington, D.C. 20026-3041.) The published type curves
use 3 × 5 cycle logarithmic graph paper with 1.85 in. for each log
cycle, such as Keuffel and Esser Co. 46 7522, and semilogarithmic graph
paper with 2.00 in. per log cycle, such as Keuffel and Esser Co. 46
6213. The Jacob straight-line methods will require fourcycle
semilogarithmic paper such as Keuffel and Esser Co. 46 6013. Instructors
may request a copy of the solution manual for
Applied Hydrogeology
from their Prentice-Hall representative. Type curves for these problems
are contained therein.A well in a water-table aquifer was pumped at a
rate of 873 m
3/d.
Drawdown was measured in a fully penetrating observation well located
90 m away. The following data were obtained (Kruseman & deRitter
1991):Find the transmissivity, storativity, and specific yield of the aquifer....
Get solution
