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A confined aquifer has transmissivity 200 ft /day and storage coefficient 0.0005. The aquifer thi...
Problem 4 A confined aquifer has transmissivity 200 ft-/day and storage coefficient 0.0005. The a...
Problem 4 A confined aquifer has transmissivity 200 ft-/day and storage coefficient 0.0005. The aquifer thickness is 100 ft. The radius of the pumping well is 12 inches. The length of well screen is 50 ft and was installed in the middle of the aquifer. Given pumping rate 22000 ft/day, for a full-penetration wel, the total drawdown in the pumping wel is 164.2 ft at t-24 hours. Calculate well loss coefficient (min'/m*) Problem 5 Continue Problem 4. Calculate well efficiency...
(Q4). For the confined aquifer shown in the figure, find the hydraulic conductivity, K and transmissivity,...
(Q4). For the confined aquifer shown in the figure, find the hydraulic conductivity, K and transmissivity, Tif the pumping rate from the well (Q) is 250 gpm. The thickness of the confined aquifer is 75 ft. The draw down at a distance of 50 feet away is 8 feet and the drawdown at a distance of 200 feet away from the well is 2 ft. The original piezometric head (h.) is 100 feet from top of the shale surface as...
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...
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...
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...
The drawdown doserved at a confined aquifer well after pumping it during 1400 minutes at a...
The drawdown doserved at a confined aquifer well after pumping it during 1400 minutes at a flow rate of 500 gal/min is 20.39 ft. The drawdowns observed at the same time at two observation wells located at 10 ft and 100 ft from the pumped well are 20 and 19.7 ft, respectively. Find the transmissivity of the aquifer and the well radius. Answ: T-8.8x105 gpd/ft, r-0.5 ft. 3.
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...
Problem 4 A confined aquifer has transmissivity 200 ft-/day and storage coefficient 0.0005. The aquifer thickness is 100 ft. The radius of the pumping well is 12 inches. The length of well screen is 50 ft and was installed in the middle of the aquifer. Given pumping rate 22000 ft/day, for a full-penetration wel, the total drawdown in the pumping wel is 164.2 ft at t-24 hours. Calculate well loss coefficient (min'/m*) Problem 5 Continue Problem 4. Calculate well efficiency...
(Q4). For the confined aquifer shown in the figure, find the hydraulic conductivity, K and transmissivity, Tif the pumping rate from the well (Q) is 250 gpm. The thickness of the confined aquifer is 75 ft. The draw down at a distance of 50 feet away is 8 feet and the drawdown at a distance of 200 feet away from the well is 2 ft. The original piezometric head (h.) is 100 feet from top of the shale surface as...
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...
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...
The drawdown doserved at a confined aquifer well after pumping it during 1400 minutes at a flow rate of 500 gal/min is 20.39 ft. The drawdowns observed at the same time at two observation wells located at 10 ft and 100 ft from the pumped well are 20 and 19.7 ft, respectively. Find the transmissivity of the aquifer and the well radius. Answ: T-8.8x105 gpd/ft, r-0.5 ft. 3.
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...
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