EBK WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119493167
Author: Mays
Publisher: VST
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3. A well with diameter of 42cm fully penetrates 32m below the static water table. After 24
hours of pumping at a rate of 6m³/min, the water level in pumped well is dropped by 12.5m.
If the distance from the center of the main well to the point in the aquifer where the draw
down becomes zero is 250m: Determine
A. Specific capacity of the well
B. Transmissibility
C. Find the discharge of the main well if it penetrates the well partially (16m below the
water table).
D. The percentage increase/decrease in the yield of the well because of partial
penetration
Consider a confined aquifer with a thickness of 12 m and hydraulic conductivity of 20 m/day. This aquifer is fully penetrated by a pumping well having a radius of 0.4 m and is operating at a discharge of 550 m3/day. Calculate the drawdown under steady-state condition in the pumping well and at a point located 41 m away from the well. Assume the radius of influence of the pumping is 310 m.
What is the pumping rate (in m°/d) required to create a
drawdown of 129 mm at 173.7 from the well after 25 days of
pumping. The aquifer is confined, and is 42.9 m thick and has a
K of 13.8 m/d. Take the specific storage as 1.7E-6 1/m.
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- A confined aquifer with T = 7.0 x 10-3 m2/s and S = 5 x 10-4 is pumped by two wells, 35 m apart. One well is pumped at 7.6 L/s and one at 15.2 L/s. Plot the drawdown h0-h versus distance along a line joining the wells, 4 hours after the start of pumping. Use 5 m increments along the line. How would I go about this question if my initial r1 would equal 0 and and r2 would equal 35m additionally how would I get the pumping rates at each 5 m increments. overall please give a step by step on how I Would go about this questionarrow_forwardA 30 cm well is pumped at the rate of 1000 ipm. The transmissibility of the aquifer is o.015 m²/s. If the well is located at a distance of 120 m from a stream, what should be the drawdown? (i) In the pumping well- (ii) In an observation well 80 m away from the pumping well on the side opposite to the stream? (iii) In an observation well 80 m away from the pumping well, on a line parallel to the stream?arrow_forwardTwo identical groundwater pumps are operating 4.2 km apart. Each pump well structure has a tube diameter of 90cm. The original water table has an elevation of 60m and the hydraulic conductivity is 32m/day. However, it is maintained that the maximum drawdown (at the tube) is 14 m. The water table will not change at the midpoint between the two pump wells. If the water source is from a confined aquifer with thickness of 5m: A. Determine the drawdown at a point 0.5 km from the pump. B. Determine the discharge of each groundwater pump in m^3/s.arrow_forward
- A 30 cm diameter well completely 15 points penetrates a confined aquifer of permeability of 45 m/day. The thickness of the aquifer is 20 m. Under steady state of pumping the drawdown at the well found to be 3.0 m and the radius of influence was 300 m. Calculate the discharge of the well * Pumping well dia = 2r + Original piezometric surface Piezometric surface under pumping Aquiclude Flow Confined aquifer Aquiclude Well Operating in a Confined Aquifer 1.548 m^3/min 0.0258 m^3/min 0.258 m^3/min 0.0851 m^3/minarrow_forwardExercise1 A 30 cm well penetrates 30 m below static water level. After a long period of pumping at a rate of 1800 lit/min, the drawdowns in the observation wells at 12 m and 36 m from the pumped well are 1.2 m and 0.5 m, respectively. Determine: A. The transmissibility of the aquifer B. The drawdown in the pumped well assuming R = 300 m. C. The specific capacity of the well.arrow_forwardA confined aquifer with transmissivity 7.0x10-3 m2/s and storativity 5.0x10-4 is pumped by two wells 35 m apart. One well is pumped at 7.6 liter/s and one at 15.2 liter/s. Plot the drawdown h0-h as a function of position along the line joining the two wells at a time 4 hours after the start of pumping.arrow_forward
- . A pumping well with a radius of 0.5 m is located midway between a river and an impermeable boundary, which are 1,000 m apart. The well is pumped at a rate of 2 m³/day. Drawdown in the pumping well is 7.3 m. If T = 0.5 m²/day for the confined aquifer, calculate the steady-state drawdown at (a) the river and (b) the impermeable boundary.arrow_forward1. Three wells each having a diameter of 250mm are installed at the vertices of an equilateral triangle 18m apart in an artesian aquifer. The radius of influence of each well is 250m and the coefficient of transmissibility is 310m²/day. The drawdown in each well is 2.5m. The thickness of the aquifer is 22m. Find A. The discharge of each well B. The percentage decreases in discharge because of well interferencearrow_forwardA fully penetrating well with diameter of 0.25 m is bored into an unconfined aquifer with hydraulic conductivity of 22 m/d and porosity of 0.3. The water table is initially at a height of 55 m above the bottom of the aquifer. After continuous pumping, a steady state drawdown of 12 m is reached. (a) If the pumping rate has no effect on the water table at a distance of 1.2 km from the pumping well, determine the pumping rate. Determine the drawdown in an observation well 600 m away from the pumping well. Determine the travel time from the observation well to the pumping well.arrow_forward
- 14. 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 5618.7 m^3/day. The first one, 88.43 meters from the test well, has a draw-down of 0.52 meters. The second one, 48 meters from the test well, has a draw-down of 1.48 meters.The static water table penetrates the well to a depth of 27 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.arrow_forwardThe distance between two pumping wells is 100 m. The transmissivity of the confined aquifer, which all the wells fully penetrate, is 1000 m²/day. The radius of influence of each well is 800 m. The pumping rate for Well #1 is 2400 m?/day and the pumping rate for Well #2 is 1800 m³/day. Determine the steady-state drawdown at the point P as shown in the figure below 40 m 60 m Well #1 Well #2arrow_forwardPlease solve,.arrow_forward
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