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- A pumping test was carried out in a soil bed of thickness 15 m and the following measurements were recorded. Rate of pumping was 10.6 x 10^-3 m3/s ; drawdowns in observation wells located at 15 m and 30 m from the center of the pumping well were 1.6 m and 1.4 m, respectively, from the initial groundwater level. The initial groundwater level was located at 1.9 m below ground level. Determine k in cm/s. a.2.6 x 10^-6 b.6.7 x 10^-1 c.3.47 x 10^-2 d.5.0 x 10^-2A pumping test was carried out in a soil bed of thickness 15 m and the following measurements were recorded. Rate of pumping was 10.6 x 10^-3 m3/s ; drawdowns in observation wells located at 15 m and 30 m from the center of the pumping well were 1.6 m and 1.4 m,Trespectively, from the initial groundwater level. The initial groundwater level was located at 1.9 m below ground level. Determine k in cm/s. a. 2.6 x 10^-6 b. 5.0 x 10^-2 c. 3.47 x 10^-2 d. 6.7 x 10^-1A pumping test was carried out in a confined aquifer 15m thick overlain by an impermeable layer 30m thick. Rate of pumping was 0.12 m3/s, drawdowns in observation wells located 15m and 30m from the center of the pumping well were 1.60 m and 1.40 m respectively, from the initial groundwater level. The diameter of the pumping well is 0.40m. Determine the coefficient of permeability
- A pumping test was done from a well in an unconfined permeable layer, 15 m thick, underlain by impermeable stratum has the following data: rate of pumping was 9.79x103 m3/s; drawdowns wells located at 15 m and 30 m from the center of the pumping well were 1.5 m and 1.3 m, respectively, from the initial groundwater level which was located 1.9 m below ground surface. Determine k. Select the correct response: 5.01 x 102 cm/s 5.25 x 102 cm/s 4.78 x 102 cm/s 4.62 x 102 cm/sAnswer both 1 (i) and (ii) 1) i) A 6 inch diameter well that fully penetrates a 40ft thick open aquifer is pumped at a rate of 100 gpm. The drawdown in the well is 22ft when a steady water level is established. The drawdown in a well 152ft distant is 12ft. Estimate the coefficient of permeabiliity of the soil deposit. ii) Discuss the validity of the answer obtained in 1( i ) and suggest how would you improve the test data obtained to produce a better value of k. Why?A pumping test was carried out in confined aquifer thickness 2 m and the following measurement was recorded. Rate of pumping was 10 m^3/s; drawdown in pumping well was 2.0 m while on the observation well located at 15 m and 20 m from the centre of the pumping well were 1.6 m and 1.4 m, respectively. Determine the hydraulic conductivity of soil.
- 3. A falling-head permeability test was run on a soil sample 9.6 cm in diameter and 10 cm long. The head at the start of the test was 90 cm. The coefficient of permeability of the soil was found to be 5 x 10-6 cm/s. The diameter the stand pipe was 1 cm. a) Determine the flow at the start of the test (cm³/hr) b) Determine how much head was lost during the first 30 minutes c) Determine the flow after 30 minutes (cm³/hr) 1 cm Ø Standpipe h 9.6 cm Ø Soil L = 10 cm Useful Formulas: -h1 As dh t = aL In k = A(t2 – t1)A pumping test was carried out to determine the average hydraulic conductivity of a sand deposit 20 m thick overlying impermeable clay. The discharge from the pumping well was 15 x 10^-3 m^3/s. Drawdowns in the observation wells located 15 m and 30 m from the centerline of the pumping well were 2.1 m and 1.6 m. respectively. The groundwater table was located at 3.2 m below the ground surface. (a) Determine the water level in the farthest observation well. (b) Determine the hydraulic conductivity in x10^-4 m/s. (c) Determine the transmissivity in m^2/day.Question 2 * The permeameter in a permeability test setup involves a soil sample 200 mm diameter and a length of 30 mm. The height of water is kept constant at 400 mm. In a duration of 4 min, water was collected in the graduated flask having a volume of 420 cu. cm. Determine the following. Flow Rate o Hydraulic gradient o Hydraulic conductivity
- Question 3 a. An oil well in the Nameless Field is producing at a stabilized rate of 600 STB/day at a stabilized bottom-hole flowing pressure of 1800 psi. Analysis of the pressure buildup test data indicates that the pay zone is characterized by a permeability of 120 md and a uniform thickness of 25 ft. The well drains an area of approximately 40 acres. The following additional data is available: w = 0.25 ft, A = 40 acres Bo = 1. 25 bbl/STB, Ho = 2. 5 cp Calculate the pressure profile (distribution) and list the pressure drop across 1 ft intervals from rw to 1.25 ft, 4 to 5 ft, 19 to 20 ft, 99 to 100 ft, and 744 to 745 ft.A constant-head permeability test is performed where the hydraulic gradient is 0.75. The crosssectional area of the sample is 0.25 ft2. The quantity of water flowing through the sample is measured to be 0.004 ft3/minute. (a) What is the coefficient of permeability in feet per minute? (b) What is the coefficient of permeability in millimeters per second?A falling head permeability test was run on a soil sample 9.60 cm in diameter and 10 cm long. The headat the start of the test was 90 cm . the coefficient of permeability of the soil was found to be 5x10-6cm/s. the diameter of the standpipe was 1 cm.a. Determine the rate of flow at the start of the test b. What will be rate of flow after 30 minutes?