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An engineer has been asked to investigate illegal pumping of groundwater from an unconfined aquifer. The...
For an unconfined aquifer with uniform recharge problem, the initial water table is 10 meters above the confining layer. Given recharge rate from rainfall 50 cm/year, pumping rate 1000 m^3 /day, aquifer hydraulic conductivity 10 m/day, calculate the effective radius and calculate steady-state groundwater head at 100 meters away from the pumping well. Con-inh odias Con-inh odias
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...
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...
A groundwater extraction well is installed in an aquifer (hydraulic conductivity = 2,000 gpd/ft2, gradient = 0.01, and aquifer thickness = 50 ft). The design pumping rate is 60 gpm. Delineate the capture zone of this recovery well by specifying the following characteristic distances of the capture zone: A) the side-stream distance from the well to the envelop of the capture zone at the line of the pumping well, B) the down-stream distance from the well to stagnation point of...
please explain the answer for part D. 6.124pts) Giselle has installed a water production well in an unconfined aquifer, She is concerned about the possibility that when the well is in use drawdown will ower the piezometric and that the water will stop flowing. She has asked for your help in the analysis well surface to the bottom of the Currently, the drawdown at observation well A, 120.0 m from the pumped well, s 12.0m. Observation at 80.0 meters is...
Use the diagram of the unconfined (water-table) aquifer on the next page for the following questions. A. This area receives 116 cm/yr of rainfall. It is not vegetated. Evaporation, as measured 2. by pan experiments, totals 90 cm/yr. The hydraulic conductivity of the aquifer unit is homogeneous and isotropic, and has been measured at 0.32 f/day. Where is the groundwater divide in the unconfined aquifer? B. What is the maximum height of the water table? C. What is the water...
When groundwater is withdrawn substantially through a well from an unconfined aquifer, the water table around the well will rise expand fall remain unchanged
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...
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....
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.