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?
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A well is pumping near a barrier boundary at a rate of 0.05 m3/s from a confined aquifer 20 m thi...
1) In a leaky confined aquifer, estimate how far from a well pumping at 175 m3/day...
1) In a leaky confined aquifer, estimate how far from a well pumping at 175 m3/day a steady state drawdown of 0.4 m will be observed. Assume the aquifer is 10 m thick with a horizontal hydraulic conductivity of 7 m/day, the K' is 1 m/day and the b' is 1 m thick, the storativity of the aquifer, S, is 0.02. 2) For the conditions in problem 1, estimate the drawdown at this location after 15 minutes. 3) At the...
An aquifer test with a constant pumping rate of 200 gpm was conducted in a confined aquifer with ...
An aquifer test with a constant pumping rate of 200 gpm was conducted in a confined aquifer with a saturated thickness of 12 m. Head measurements in an observation well located 76.2 m (250 ft) from the pumping well yields the following plot. Use the Cooper-Jacob (1946) straight-line method to compute transmissivity [m/d], hydraulic conductivity [m/d and m/s], storativity and specific storage m ] of the aquifer 0 0.2 0.4 0.6 0.8 1.2 0.1 10 100 1000 Time (min)
An...
A well is constructed in a confined aquifer. The aquifer has a uniform thickness of 50...
A well is constructed in a confined aquifer. The aquifer has a uniform thickness of 50 ft overlain by a aquitard and the bottom is 115 ft below ground surface (bgs). A pumping test weas used to determine the hydraulic conductivity of the aquifer. The initial piezometric (potentiometric) surface of the confined aquifer was 49 ft bgs at the pumping well and the observation wells. After water was pumped at a rate of 0.46 cu ft/sec for several days, the...
P5. A well is located in an aquifer with a conductivity of 20 m/d and has...
P5. A well is located in an aquifer with a conductivity of 20 m/d and has a storativity of 0.0051. The aquifer is 22 m thick and is pumped at a rate of 2800 m3/day. Determine the drawdown at a distance of 8 m from the well after 3 days of pumping?
a. A well 50 cm in diameter penetrates 33 m below the static water table. After...
a. A well 50 cm in diameter penetrates 33 m below the static water table. After a long period of pumping at a rate of 80 m/h, the drawdowns in two observation wells A and B, 18 and 45 m from the pumped well, were found to be 1.8 and 1.1 m respectively. Determine . the hydraulic conductivity of the aquifer (in m/d) . the expected drawdown in the pumped well • the radius of influence of the pumped well,...
Question 5: (25 marks) A fully penetrating pumping well is located in a confined aquifer that can be considered to have an infinite extent in all directions. There is no recharge to the aquifer a...
Question 5: (25 marks) A fully penetrating pumping well is located in a confined aquifer that can be considered to have an infinite extent in all directions. There is no recharge to the aquifer and no other pumping wells in the area. There are two observation wells located at 100 and 500 m, respectively, from the pumping wells. The aquifer and the pumping well have the following properties: Depth to top of aquifer: 50 m Aquifer thickness: 5 m Aquifer...
1. (2 points) A well in a uniform, homogeneous, isotropic confined aquifer is pumped at a...
1. (2 points) A well in a uniform, homogeneous, isotropic confined aquifer is pumped at a rate of 815 L/min. After 3 days it looks as if the water levels have stabilized in observation wells at distances of 20 m and 200 m from the pumping well. The drawdown in the well at 20 m is 6.5 m and the drawdown in the well at 200 m is 3.5 m. a) Use the Thiem solution to determine the aquifer transmissivity....
Lh the well feaches M a 6.5.5 A pumping test was performed to determine the transrnissivity T and...
determine w(u) then use to find Transmissivity and
storavity
lh the well feaches M a 6.5.5 A pumping test was performed to determine the transrnissivity T and the storativity S of a confined aquifer. The drawdown versus time data in an observation well 30 m away from the pumping well are given in the following table. The discharge from the pumped weli was at a constant rate of 4x m'/min throughout the test. Determine the aquifer properties. 110 Time (min)...
Problem 24 A well is screened in a completely confined aquifer is to be pumped at a rate of 165,000 ft/d for 30 days. If the aquifer transmissivity is 5320 ft/d and the storativity is 0.0007, wha...
Problem 24 A well is screened in a completely confined aquifer is to be pumped at a rate of 165,000 ft/d for 30 days. If the aquifer transmissivity is 5320 ft/d and the storativity is 0.0007, what is the drawdown at 50, 150, 250, 500, 1000, 3000, 5000, and 10,000 ft Problem 25 If the aquifer in problem 24 is not completely confined, but overlain by a 8.0 ft leaky confining layer with a vertical hydraulic conductivity of 0.024 ft/d...
Question. A 50 m thick homogeneous confined aquifer is shortened length wide by two parallel impermeable...
Question. A 50 m thick homogeneous confined aquifer is shortened length wide by two parallel impermeable boundaries as shown below. The well is pumped at 0.3 mº/s for 3 days. Before pumping started, the real well (R) and observation well (A) are positioned at 300 m and 200 m from the barrier of the right hand side aquifer. Calculate the drawdown at a point A at the end of the last day (t = 3 days). Assume T = 0.01...
An aquifer test with a constant pumping rate of 200 gpm was conducted in a confined aquifer with a saturated thickness of 12 m. Head measurements in an observation well located 76.2 m (250 ft) from the pumping well yields the following plot. Use the Cooper-Jacob (1946) straight-line method to compute transmissivity [m/d], hydraulic conductivity [m/d and m/s], storativity and specific storage m ] of the aquifer 0 0.2 0.4 0.6 0.8 1.2 0.1 10 100 1000 Time (min)
An...
P5. A well is located in an aquifer with a conductivity of 20 m/d and has a storativity of 0.0051. The aquifer is 22 m thick and is pumped at a rate of 2800 m3/day. Determine the drawdown at a distance of 8 m from the well after 3 days of pumping?
a. A well 50 cm in diameter penetrates 33 m below the static water table. After a long period of pumping at a rate of 80 m/h, the drawdowns in two observation wells A and B, 18 and 45 m from the pumped well, were found to be 1.8 and 1.1 m respectively. Determine . the hydraulic conductivity of the aquifer (in m/d) . the expected drawdown in the pumped well • the radius of influence of the pumped well,...
Question 5: (25 marks) A fully penetrating pumping well is located in a confined aquifer that can be considered to have an infinite extent in all directions. There is no recharge to the aquifer and no other pumping wells in the area. There are two observation wells located at 100 and 500 m, respectively, from the pumping wells. The aquifer and the pumping well have the following properties: Depth to top of aquifer: 50 m Aquifer thickness: 5 m Aquifer...
determine w(u) then use to find Transmissivity and
storavity
lh the well feaches M a 6.5.5 A pumping test was performed to determine the transrnissivity T and the storativity S of a confined aquifer. The drawdown versus time data in an observation well 30 m away from the pumping well are given in the following table. The discharge from the pumped weli was at a constant rate of 4x m'/min throughout the test. Determine the aquifer properties. 110 Time (min)...
Problem 24 A well is screened in a completely confined aquifer is to be pumped at a rate of 165,000 ft/d for 30 days. If the aquifer transmissivity is 5320 ft/d and the storativity is 0.0007, what is the drawdown at 50, 150, 250, 500, 1000, 3000, 5000, and 10,000 ft Problem 25 If the aquifer in problem 24 is not completely confined, but overlain by a 8.0 ft leaky confining layer with a vertical hydraulic conductivity of 0.024 ft/d...
Question. A 50 m thick homogeneous confined aquifer is shortened length wide by two parallel impermeable boundaries as shown below. The well is pumped at 0.3 mº/s for 3 days. Before pumping started, the real well (R) and observation well (A) are positioned at 300 m and 200 m from the barrier of the right hand side aquifer. Calculate the drawdown at a point A at the end of the last day (t = 3 days). Assume T = 0.01...
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