A river penetrates a confined gravel aquifer of 2 m thickness and receives flow from the...
A river penetrates a confined gravel aquifer of 2 m thickness and receives flow from the aquifer on both banks.
From both sides, the hydraulic gradient towards the river is 5 m/km.
Over a linear section of the river between gauging stations 4 km apart, the river flow rate increases by 1000 litres per second (L/s).
Estimate the aquifer hydraulic conductivity, and sketch this problem.
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A river penetrates a confined gravel aquifer of 2 m thickness
and receives flow from the...
Watch your significant figures! Example 2. A confined aquifer 32.0 m thick has two monitoring wells...
Watch your significant figures! Example 2. A confined aquifer 32.0 m thick has two monitoring wells spaced 420.0 m apart along the direction of groundwater flow. The difference in water level in the wells is 3.5 m (the difference in piezometric head). The hydraulic conductivity is 22.0 m/day. Estimate the rate of flow per meter of distance perpendicular to the flow (i.e., Q in m'/day per meter of aquifer width). 420.0 m 3.5 m Flow 32.0 m Confined aquifer 22.0...
A 0.5-m diameter well fully penetrates an unconfined aquifer, which is 40.0 m thick. The drawdown...
A 0.5-m diameter well fully penetrates an unconfined aquifer, which is 40.0 m thick. The drawdown at the pumped well is 10 m and the hydraulic conductivity of the aquifer is 0.2 . 10-3 (m s-'). If the flow is steady and discharge is 0.01 (mºs-'), determine the drawdown at a site 50.0 m from the well. Draw-down (m): 5.0 8.6 18.6 30.0 A wastewater treatment plant treats 1000 (mº
A well is pumping near a barrier boundary at a rate of 0.05 m3/s from a confined aquifer 20 m thi...
A well is pumping near a barrier boundary at a rate of 0.05 m3/s
from a confined aquifer 20 m thick. The hydraulic conductivity of
the aquifer is 5 x 10-4 m/s, and its storativity is 4 x 10-5.
Determine the drawdown in the observation well after 30 hours of
continuous pumping. What is the fraction of the drawdown
attributable to the barrier boundary?
River fi Гр-240 m 30° 300 m 300 m
River fi Гр-240 m 30° 300 m...
Table 1: Aquifer properties for use in Problem 2 K (m/s) 2.75E-03 0.25 5.00E-03 0.35 1.00E-02...
Table 1: Aquifer properties for use in Problem 2 K (m/s) 2.75E-03 0.25 5.00E-03 0.35 1.00E-02 0.29 9.50E-05 7.50E-04 0.22 0.3 2. A heterogeneous sand and gravel aquifer has the hydraulic properties provided in Table 1, Assuming strictly horizontal flow, compute equivalent hydraulic conductivity [m/s] and porosity of the aquifer. 3. Using your average K and n values from (2) and a hydraulic gradient of 0.005, compute the average velocity [m/s] of this aquifer
A confined aquifer is 3 m thick. The potentiometric surface drops 17 cm between two wells...
A confined aquifer is 3 m thick. The potentiometric surface drops 17 cm between two wells that are 240 m apart. If the hydraulic conductivity of the aquifer is 6.4 m/day and the effective porosity is 0.17, (a) determine the volume of water flowing per day through a strip of the aquifer that is 3 m wide; (b) determine the groundwater flow velocity; (c) calculate the velocity of a contaminant in this aquifer if dry bulk density of aquifer material...
2. Parallel drainage canals are installed in a rectangular unconfined aquifer. They fully penetrate the aquifer and are 50 m apart. The elevation difference between the land surface and the bottom of...
2. Parallel drainage canals are installed in a rectangular unconfined aquifer. They fully penetrate the aquifer and are 50 m apart. The elevation difference between the land surface and the bottom of the canals is 5 m and the canal stages are 2.5 m. Assume a soil hydraulic conductivity of 0.8 m/day Recharge Land surface 50ml Drainagelcanal 2.5m Impermeable layer (a) Sketch the approximate shape of the water table between the two canals under a highly urbanized condition in which...
C) Show that when ga >g the Penman-Monteith equation simplifies to d) Use the approximation in pa...
c) Show that when ga >g the Penman-Monteith equation simplifies to d) Use the approximation in part c) to estimate the transpiration rate. e) What would be the transpiration rate if the canopy offered no stomatal resistance ie ge >ga. Could forests survive if they had to support such transpiration rates? 8. (15 marks - 5 points cach) A confined aquifer has a source of recharge. The saturated hydraulic conductivity K of the aquifer is 50 m/day, and the effective...
The sediments that formed the Nubian aquifer system are much older than those of the High...
The sediments that formed the Nubian aquifer system are
much older than those of the High Plains aquifer system or the
sediments of Bangladesh. The oldest rocks in the aquifer are
Cambrian in age (541 to 485 million years old). After deposition,
these sediments were buried, compacted, and cemented, and lithified
to form sedimentary rocks. Two cross sections are shown. The sands
that form the sandstones were deposited by rivers and wind in
nearshore (beach) areas. The sandstone is distinguished...
An unconfined aquifer has an initial thickness of 15.80 m. The initial water table is horizontal...
An unconfined aquifer has an initial thickness of 15.80 m. The initial water table is horizontal and located 4.7 m below the ground surface. A 15-cm diameter well is driven to the bottom of the aquifer and pumped at 3000 Lpm until steady state conditions are achieved. At this time the drawdown at the well is 4.35 m and the drawdown in an observation well located 850 m away is 0.12 m. (a) Make a sketch that defines the problem....
Question 4: (25 marks) The figure below shows a thin aquifer connecting two irrigation canals 1000...
Question 4: (25 marks) The figure below shows a thin aquifer connecting two irrigation canals 1000 m apart and running parallel to each other. The canal to the left has a water surface elevation of 1007 m while that to the right has a water surface elevation of 1008.5 m. The sand aquifer connecting the two canals has a constant thickness of 1.5 m, bottom elevation of 1000m, porosity of 0.3 and a hydraulic conductivity of 250 m/d. The sand...
Watch your significant figures! Example 2. A confined aquifer 32.0 m thick has two monitoring wells spaced 420.0 m apart along the direction of groundwater flow. The difference in water level in the wells is 3.5 m (the difference in piezometric head). The hydraulic conductivity is 22.0 m/day. Estimate the rate of flow per meter of distance perpendicular to the flow (i.e., Q in m'/day per meter of aquifer width). 420.0 m 3.5 m Flow 32.0 m Confined aquifer 22.0...
A 0.5-m diameter well fully penetrates an unconfined aquifer, which is 40.0 m thick. The drawdown at the pumped well is 10 m and the hydraulic conductivity of the aquifer is 0.2 . 10-3 (m s-'). If the flow is steady and discharge is 0.01 (mºs-'), determine the drawdown at a site 50.0 m from the well. Draw-down (m): 5.0 8.6 18.6 30.0 A wastewater treatment plant treats 1000 (mº
A well is pumping near a barrier boundary at a rate of 0.05 m3/s
from a confined aquifer 20 m thick. The hydraulic conductivity of
the aquifer is 5 x 10-4 m/s, and its storativity is 4 x 10-5.
Determine the drawdown in the observation well after 30 hours of
continuous pumping. What is the fraction of the drawdown
attributable to the barrier boundary?
River fi Гр-240 m 30° 300 m 300 m
River fi Гр-240 m 30° 300 m...
Table 1: Aquifer properties for use in Problem 2 K (m/s) 2.75E-03 0.25 5.00E-03 0.35 1.00E-02 0.29 9.50E-05 7.50E-04 0.22 0.3 2. A heterogeneous sand and gravel aquifer has the hydraulic properties provided in Table 1, Assuming strictly horizontal flow, compute equivalent hydraulic conductivity [m/s] and porosity of the aquifer. 3. Using your average K and n values from (2) and a hydraulic gradient of 0.005, compute the average velocity [m/s] of this aquifer
2. Parallel drainage canals are installed in a rectangular unconfined aquifer. They fully penetrate the aquifer and are 50 m apart. The elevation difference between the land surface and the bottom of the canals is 5 m and the canal stages are 2.5 m. Assume a soil hydraulic conductivity of 0.8 m/day Recharge Land surface 50ml Drainagelcanal 2.5m Impermeable layer (a) Sketch the approximate shape of the water table between the two canals under a highly urbanized condition in which...
c) Show that when ga >g the Penman-Monteith equation simplifies to d) Use the approximation in part c) to estimate the transpiration rate. e) What would be the transpiration rate if the canopy offered no stomatal resistance ie ge >ga. Could forests survive if they had to support such transpiration rates? 8. (15 marks - 5 points cach) A confined aquifer has a source of recharge. The saturated hydraulic conductivity K of the aquifer is 50 m/day, and the effective...
The sediments that formed the Nubian aquifer system are
much older than those of the High Plains aquifer system or the
sediments of Bangladesh. The oldest rocks in the aquifer are
Cambrian in age (541 to 485 million years old). After deposition,
these sediments were buried, compacted, and cemented, and lithified
to form sedimentary rocks. Two cross sections are shown. The sands
that form the sandstones were deposited by rivers and wind in
nearshore (beach) areas. The sandstone is distinguished...
Question 4: (25 marks) The figure below shows a thin aquifer connecting two irrigation canals 1000 m apart and running parallel to each other. The canal to the left has a water surface elevation of 1007 m while that to the right has a water surface elevation of 1008.5 m. The sand aquifer connecting the two canals has a constant thickness of 1.5 m, bottom elevation of 1000m, porosity of 0.3 and a hydraulic conductivity of 250 m/d. The sand...
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