Karst limestone- 2. A southwestern US city needs to find an underground source of water to provide 1,000,000 liters per day to a new shopping mall outside of town. Under the mall site, a gently-dipping river channel aquifer made of clean quartz sandstone has an average thickness of 15 meters and an average channel width of 1.5 kilometers. Two piezometers have been installed in this aquifer, 0.7 km apart in the direction of flow. The up-dip piezometer has a head of 1534 meters, while the down-dip one has a head of 1538 meters. a) What direction is the groundwater flowing in this aquifer? (up-dip or down-dip) b) Calculate if this aquifer will provide enough water for the mall? Included is a figure showing intrinsic permeability (k) and hydraulic conductivity (K). Rocks Unconsolidated 身 K K K deposits K (darcy) (cm²) (cm/s) (m/s) (gol/day) Gocial hill- Silt, less sand- Clean sond Unfractured metamorphic and igneous rocks Shale Fractured igne metamorphi Limestone and dolomite Sandstone- разешовмир -102 10 10 -103 10 -10-7 -100 -1 -10-8-10-8 -10-1 F10 F10 -10- -10% -103 1- 2013 -10° -10 -10 101 & -103 10 1 10-2 104 2 2 2 2 2 2 -10° -10 F10 F100 100 10 10 100-105 -10- -1 -10-3 10 -10° -10° ·10-1 F10+ -10-1 -10° 10- 10- F10+ ₤10-0 10 ·1010 10-3 +10° 10 10 10 104 +10+ 101010 -10-18 10 -100 100 | 10 | 10-13-10 10-7

Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter7: Permeability
Section: Chapter Questions
Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...
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Karst limestone-
2. A southwestern US city needs to find an underground source of water to provide 1,000,000 liters per day to
a new shopping mall outside of town. Under the mall site, a gently-dipping river channel aquifer made of
clean quartz sandstone has an average thickness of 15 meters and an average channel width of 1.5
kilometers. Two piezometers have been installed in this aquifer, 0.7 km apart in the direction of flow. The
up-dip piezometer has a head of 1534 meters, while the down-dip one has a head of 1538 meters.
a) What direction is the groundwater flowing in this aquifer? (up-dip or down-dip)
b) Calculate if this aquifer will provide enough water for the mall? Included is a figure showing intrinsic
permeability (k) and hydraulic conductivity (K).
Rocks Unconsolidated
身
K
K
K
deposits
K
(darcy) (cm²) (cm/s) (m/s) (gol/day)
Gocial hill-
Silt, less sand-
Clean sond
Unfractured
metamorphic and
igneous rocks
Shale
Fractured igne
metamorphi
Limestone and
dolomite
Sandstone-
разешовмир
-102 10 10 -103
10 -10-7
-100
-1
-10-8-10-8
-10-1
F10 F10 -10-
-10% -103
1-
2013
-10° -10 -10
101
&
-103 10 1
10-2
104
2 2 2 2 2 2
-10°
-10
F10 F100
100
10
10 100-105
-10-
-1
-10-3
10 -10°
-10°
·10-1
F10+
-10-1 -10°
10-
10-
F10+
₤10-0 10
·1010 10-3
+10°
10 10 10
104
+10+
101010
-10-18
10
-100 100 | 10 | 10-13-10
10-7
Transcribed Image Text:Karst limestone- 2. A southwestern US city needs to find an underground source of water to provide 1,000,000 liters per day to a new shopping mall outside of town. Under the mall site, a gently-dipping river channel aquifer made of clean quartz sandstone has an average thickness of 15 meters and an average channel width of 1.5 kilometers. Two piezometers have been installed in this aquifer, 0.7 km apart in the direction of flow. The up-dip piezometer has a head of 1534 meters, while the down-dip one has a head of 1538 meters. a) What direction is the groundwater flowing in this aquifer? (up-dip or down-dip) b) Calculate if this aquifer will provide enough water for the mall? Included is a figure showing intrinsic permeability (k) and hydraulic conductivity (K). Rocks Unconsolidated 身 K K K deposits K (darcy) (cm²) (cm/s) (m/s) (gol/day) Gocial hill- Silt, less sand- Clean sond Unfractured metamorphic and igneous rocks Shale Fractured igne metamorphi Limestone and dolomite Sandstone- разешовмир -102 10 10 -103 10 -10-7 -100 -1 -10-8-10-8 -10-1 F10 F10 -10- -10% -103 1- 2013 -10° -10 -10 101 & -103 10 1 10-2 104 2 2 2 2 2 2 -10° -10 F10 F100 100 10 10 100-105 -10- -1 -10-3 10 -10° -10° ·10-1 F10+ -10-1 -10° 10- 10- F10+ ₤10-0 10 ·1010 10-3 +10° 10 10 10 104 +10+ 101010 -10-18 10 -100 100 | 10 | 10-13-10 10-7
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