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.
Kindly give me right solution with step by step.
The thickness of a horizontal, confined, homogeneous, isotropic aquifer of infinite areal
extent is 30m. A well fully penetrating the aquifer was continuously pumped at a
constant rate of 0.1 m³/s for a period of 1 day. The drawdowns given in the table below
were observed in a fully penetrating well 90 m from the pumping well.
Compute the transmissivity and the storativity by using:
a) the Theis method of log-log matching.
b) the Cooper-Jacob method of semi-log plotting.
[For Part a), you have to first use attached Table to plot the values of W(u) versus 1/u on
a log-log graph in the range of 10-9
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- Three piezometers have been installed in the confined aquifer shown in Figure 2 below. The aquifer has a uniform thickness of 3.5 m and a hydraulic conductivity of 2x10-1 cm/s. Determine the hydraulic gradient, the direction of flow, the transmissivity, and the flow rate per unit width of the aquifer.arrow_forwardA well in an aquifer is pumped over a long period at a rate of 0.05 m3 /s under approximate steady-state conditions. The steady-state drawdowns, from the water table level, at two observation wells at 25 m and 50 m from the abstraction well were observed to be 15.3m and 9.5m, respectively. If the saturated thickness of the aquifer prior to pumping is 80 m, determine the hydraulic conductivity of the aquifer material.arrow_forward2. (a) A well in an aquifer is pumped over a long period at a rate of 0.05 m3 /s under approximate steady-state conditions. The steady-state drawdowns, from the water table level, at two observation wells at 25 m and 50 m from the abstraction well were observed to be 15.3m and 9.5m, respectively. If the saturated thickness of the aquifer prior to pumping is 80 m, determine the hydraulic conductivity of the aquifer material. (b) Will the actual drawdown in the pumping well be more than the theoretical drawdown? If yes, why and what measures can you recommend for reducing the drawdown in the pumping well?arrow_forward
- A well penetrates an unconfined aquifer, with undisturbed water level (ho) equal to 21m. After pumping the well at a constant rate of Q = 0.07 m/s, the steady-state drawdown at distances of 45 m and 110 m from the well are 3 m and 1 m. respectively. Assume the void ratio as 0.2. Compute the hydraulic conductivity of the aquifer. 215.0 m/day what is the porosity 0.16 find the darcy velocity in m/day 69.4 m/dayarrow_forwardQ1) An unconfined aquifer has a thickness of 33 m. A fully penetration 20 cm diameter well in the aquifer is pumped at a rate of 33 lit/s. The drawdown measured in two observation wells located at a distance of 10 m and 100 m from the well are 7.5 m and 0.5 m respectively. Determine: 1- Sketch the case. 2- the average hydraulic conductivity of the aquifer. 3- At what distance from the well the drawdown is insignificant?arrow_forwardA 2‐ft diameter well penetrates vertically through a confined aquifer 50 ft thick. When the well is pumped at 500 gpm, the drawdown in a well 50 ft away is 10 ft and in another well 100 ft away is 3 ft.(a) What is the approximate head in the pumped well for steady‐state conditions, and what is the approximate drawdown in the well?(b) Compute the transmissivity. Take the initial piezometric level as 100 ft above the datum.arrow_forward
- A 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_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_forwardQ2/ A well of diameter 30 cm fully penetrates a confined aquifer of thickness 1.5 m. When pumped at a steady rate of 30 l/s the drawdowns observed in wells at radial distances of 10 m and 40 m are 1.5 m and 1 m, respectively. Compute the radius of influence, the hydraulic conductivity and drawdown at the well.arrow_forward
- A 1-m diameter well penetrates vertically through a confined aquifer 30 cm thick. When the well is pumped at 113 m³/hr, the drawdown in a well 15 m away is 1.8 m, in another well 50 m away, it is 0.5 m. What is the approximate head in the pumped well for steady state conditions and what is the approximate drawdown in the well? Also compute the transmissivity of the aquifer and the radius of influence of the pumping well. Take the initial piezometric level as 40 m above the datum.arrow_forwardPart 2 pleasearrow_forwarda 45 cm well in an unconditioned aquifer of saturated thickness (40+8) m yields (600+10(2) lpm under a drawdown of 4m at the pumping well. Assuming radius of influence of (500+10(3)m, a. what is the hydraulic conductivity of the aquifer in m/day? b. what will be the drawdown 200 m from the well? c. what will be the piezometric head 400 m from the wellarrow_forward
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