4. Look at the regional groundwater flow system shown below. This system is isotropic, homogeneous, and unconfined. Dashed lines are equipotentials. For each of the items listed, use the figure below for working out the results, then draw neatly on the diagram on the answer sheet. 40 30 20 10 -10 -20 Stream Cartoon is vertically exaggerated and not drawn to scale!!! Ground surface Lake Water table F E 40 30 20 10 1 -20 Elevation (m-msl) A. Label all of the head contours (dashed lines) to nearest 5 m. B. Fill out the table listing elevation head, pressure head, and total head for points A-J. Although the figure is not drawn exactly to scale, you should be able to estimate or calculate head values with accuracy of 5 m. Hint: do not try to estimate y from depth below the water table! C. Label one aquifer recharge location (R) and one discharge area (D) on the figure. These are places where there is net transport from the surface and to the surface, at the aquifer top. D. Add three flow lines indicating the paths of water particles starting at points X, Y, and Z. E. You should find that total head is greater at point D than it is at point H. Does this mean that water flows from point D to point H? Explain why or why not in a single sentence (under the table on the answer sheet).
4. Look at the regional groundwater flow system shown below. This system is isotropic, homogeneous, and unconfined. Dashed lines are equipotentials. For each of the items listed, use the figure below for working out the results, then draw neatly on the diagram on the answer sheet. 40 30 20 10 -10 -20 Stream Cartoon is vertically exaggerated and not drawn to scale!!! Ground surface Lake Water table F E 40 30 20 10 1 -20 Elevation (m-msl) A. Label all of the head contours (dashed lines) to nearest 5 m. B. Fill out the table listing elevation head, pressure head, and total head for points A-J. Although the figure is not drawn exactly to scale, you should be able to estimate or calculate head values with accuracy of 5 m. Hint: do not try to estimate y from depth below the water table! C. Label one aquifer recharge location (R) and one discharge area (D) on the figure. These are places where there is net transport from the surface and to the surface, at the aquifer top. D. Add three flow lines indicating the paths of water particles starting at points X, Y, and Z. E. You should find that total head is greater at point D than it is at point H. Does this mean that water flows from point D to point H? Explain why or why not in a single sentence (under the table on the answer sheet).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:4. Look at the regional groundwater flow system shown below. This system is isotropic,
homogeneous, and unconfined. Dashed lines are equipotentials. For each of the items listed, use
the figure below for working out the results, then draw neatly on the diagram on the answer
sheet.
40
30
20
10
0
-10
-20
Cartoon is vertically exaggerated
and not drawn to scale!!!
Point
A
B
C
D
Stream
E
F
G
H
I
J
h (m), total head
Water
table
Ground
surface
Lake
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
z (m), elevation head
40
30
A. Label all of the head contours (dashed lines) to nearest 5 m.
B. Fill out the table listing elevation head, pressure head, and total head for points A-J. Although
the figure is not drawn exactly to scale, you should be able to estimate or calculate head values
with accuracy of 5 m. Hint: do not try to estimate y from depth below the water table!
C. Label one aquifer recharge location (R) and one discharge area (D) on the figure. These are
places where there is net transport from the surface and to the surface, at the aquifer top.
D. Add three flow lines indicating the paths of water particles starting at points X, Y, and Z.
E. You should find that total head is greater at point D than it is at point H. Does this mean that
water flows from point D to point H? Explain why or why not in a single sentence (under the
table on the answer sheet).
20
-10
-20
Elevation (m-msl)
(m), pressure head
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VIEWStep 2: (a) Label all head contours to the nearest of 5 m
VIEWStep 3: (b) Find, elevation head, pressure head and total head of points A-J
VIEWStep 4: (c) Label recharge and discharge location
VIEWStep 5: (d) Add three flow lines starting from X, Y and Z
VIEWStep 6: (e) Explain will water flow from D to H
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