4. Look at the regional groundwater flow system shown below. This system is isotropic, homogeneous, and...

 

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 40 Stream 30 430 20 20 10 10 0 -10 -20 Cartoon is vertically exaggerated and not drawn to scale!!! Water table Ground surface Lake H 30 Elevation (m-msl) 10 20 10 4320 0 -10 E -20 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 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). Point A B C D E F G H I J h (m), total head z (m), elevation head (m), pressure head 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 40 Stream 30 430 20 20 10 10 0 -10 -20 Cartoon is vertically exaggerated and not drawn to scale!!! Water table Ground surface Lake H 30 Elevation (m-msl) 10 20 10 4320 0 -10 E -20 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 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). Point A B C D E F G H I J h (m), total head z (m), elevation head (m), pressure head