EBK WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119493167
Author: Mays
Publisher: VST
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An unconfined aquifer is 10 m thick and is being pumped so that one observation well placed at a distance 76 m shows a drawdown of 0.5 m. On the opposite side of the extraction well is another observation well 100 m from the extraction well, shows a drawdown of 0.3 m. Assume the coefficient of permeability of 50 m/day.
a.) What is the discharge f the extraction well?
b.) Suppose the well at 100 m from the extraction well is now pumped. Show with a sketch what this will do to the drawdown.
c.) Suppose the aquifer sits on an aquaclude that has a slope of 1/100. Show with a sketch what this will do to the drawdown.
A 300 mm diameter test well penetrates 27 m below the static water table. After 24 hours of pumping at 69 liters/sec, the water level in an observation well at a distance of 95 m from the test well is lowered 0.5 m and the other observation well at a distance of 35 m from the test well, the drawdown is 1.1 m. Compute the transmissibility of the aquifer in m^2/day.
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- Part 2 pleasearrow_forward(b) | A 400 mm diameter well fully penetrates a confined aquifer of thickness 20 m is pumped at a constant rate of 2500 m/day. The drawdown in the pumping well is observed as 4 m and the radius of influence is at a distance of 100 m. (i) Calculate the transmissivity of the aquifer; (ii) Determine the hydraulic conductivity of the aquifer material and draw the neat sketch of the wellarrow_forward7 Yuri wants to determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 6,481 m^3/day. The first one, 87.94 meters from the test well, has a draw-down of 0.56 meters. The second one, 46 meters from the test well, has a draw-down of 1.25 meters.The static water table penetrates the well to a depth of 28 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.arrow_forward
- A well is pumping at an unknown, steady rate in a confined aquifer. Near the pumping well are two observation wells; observation well A is located 8m from the pumping well and B is located 24m from the pump- ing well. The heads in these wells are hA = 134.20 and hB = 134.28 m. You know from prior pumping tests of the well that the well and the observation wells are screened in a confined aquifer with transmissivity T = 1200 m2/day. Assuming that without the well pumping there would be no hydraulic gradient at all, what is the pumping rate of the well?arrow_forwardA confined aquifer has a transmissivity T = 200 ft2/day (18.6 m2/day) and a storativity S = 0.0002. A fully penetrating well begins pumping in this aquifer at a rate of 1500ft3/day (42.5m3/day). Using the Theis solution predict the drawdown h0 h at a radius of r = 100 ft (30.5 m) at the following elapsed times: 10 minutes, 1 hour, 5 hours, and 24 hours. *tip* Spreadsheet software could help you do these repeated calculations.arrow_forwardA 30 cm diameter well penetrates 25 m below the static watertable. After 24 hours of pumping @ 5400 litres/minute, the water level in a test well at 90 m is lowered by 0.53 m, and in a well 30 m away the drawdown is 1.11 m. (a) What is the transmissibility of the aquifer? (b) Also determine the drawdown in the main well.arrow_forward
- A single ideal pumping well, with radius of 1.0 ft and flow rate of 155 gpm, exists in an ideal confined aquifer. The aquifer has a saturated thickness of 82 ft. The pump continues running until equilibrium conditions are reached. The drawdown at the pumping well is 42 ft, and the drawdown at an observation well 138 ft away is 7.5 ft. Determine: Find the transmissivity in ft^2/day and hydraulic conductivity in ft^2/day Find the radius of influence in feet.arrow_forwardPlz answer ASAParrow_forwardTo determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 5,598.8 m^3/day. The first one, 88.03 meters from the test well, has a draw-down of 0.95 meters. The second one, 42 meters from the test well, has a draw-down of 1.39 meters.The static water table penetrates the well to a depth of 27 meters. Determine the radius of influence of the aquifer in meters.arrow_forward
- Estimate the transmissivity of confined - aquifer in steady state flow if you know the drawdown is 3 m in piezometer well while 5 m in pumping well. The distance from pumping well to piezometer well is 30 m and radius of pumping well is 2 m. The pumping rate is (5 x 102 m3/d)arrow_forwardA pump test was carried out in an unconfined aquifer of k = 3x10^-6 m/s with a flow rate of 25m3/hour. The radius of the well is 0.5m and the aquifer has a depth of 80m above an impermeable stratum. The drawdown in an observation well at a distance of 150m from the well is 2.5m. Calculate the depth of water in the well and the radius of influence??arrow_forwardYuri wants to determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 6,162.8 m^3/day. The first one, 83.03 meters from the test well, has a draw-down of 0.92 meters. The second one, 40 meters from the test well, has a draw-down of 1.44 meters.The static water table penetrates the well to a depth of 28 meters. Determine the radius of influence of the aquifer in meters.arrow_forward
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