is pumped out at a rate of 540 liters per minute when steady state conditions are reached. Two observation wells are located at 18 m and 36 m from the Centre of the test well. The depths of the drawdown curve are
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- An artesian aquifer 5 m thick with a piezometric surface 65 m above the bottom confining layer is being pumped by a fully penetrating well. The aquifer is a mixture of sand and gravel. A steady-state drawdown of 7 m ・ s−1 is observed at a nonpumping well located 10 m away. If the pumping rate is 0.020 m3 ・ s−1, how far away is a second nonpumping well that has an observed drawdown of 2 m?A site consists of a homogeneous dense silty sand layer of 11 m thickness, which is underlain by an impervious stiff clay stratum. The initial water table was at 2 m depth below the ground level. A pumping test was carried out by pumping out water at the rate of 0.7 m° /min. Observation wells were dug into the ground at 20 m and 40 m distances from the center line of the well. At steady state (i.e., when there was no change in water levels in the observation wells), the water levels in the two wells dropped by 500 mm and 200 mm, respectively. Determine the hydraulic conductivity of the clayey sand layer. (Enter your answer to three significant figures.) k cm/sA site consists of a homogeneous dense silty sand layer of 9 m thickness, which is underlain by an impervious stiff clay stratum. The initial water table was at 4 m depth below the ground level. A pumping test was carried out by pumping out water at the rate of 0.7 m°/min. Observation wells were dug into the ground at 15 m and 50 m distances from the center line of the well. At steady state (i.e., when there was no change in water levels in the observation wells), the water levels in the two wells dropped by 600 mm and 100 mm, respectively. Determine the hydraulic conductivity of the clayey sand layer. (Enter your answer to three significant figures.) k = cm/s
- A field pumping test was conducted from an aquifer of sandy soil of 4 m thickness confined between two impervious strata. When equilibrium was established, 105 liters of water was pumped out per hour. The water elevation in an observation well 3.50 m away from the test well was 2.1 m and another 6.0 m away was 2.7 m from the roof level of the impervious stratum of the aquifer. Find the value of k of the soil in m/sec.A 30 cm well penetrates 45 m below the static water table. After a long period of pumping at a rate of 1200 lpm, the drawdown in the wells 20 m and 45 m from the pumped well is found to be 3.8 and 2.4 m respectively. Determine the transmissivity (-K*aquifer thickness) of the aquifer. What is the drawdown in the pumped well? [Hint: Use water table depth as aquifer thickness in the case of unconfined aquifer]A sand deposit of 12 m thick overlies a clay layer. The water table is 3 m below the ground surface. In a field permeability pump-out test, the water is pumped out at a rate of 540 litres per minute when steady state conditions are reached. Two observation wells are located at 18 m and 36 m from the centre of the test well. The depths of the drawdown curve are 1.8 m and 1.5 m respectively for these two wells. Determine the coefficient of permeability. a. 625 X 10^-2 b. 2.15 x 10^-2 c. 4.5 x 10^-1 d. 1.6 X 10^-1
- 2. A well with a diam. of 0.6 m. is constructed in a confined aquifer as shown. The sand aquifer has a uniform thickness of 15 m. overlain by an impermeable layer with a depth of 35 m. A pumping test was conducted to determine the coefficient of permeability of the aquifer. The initial piezometric surface was 15 m. below the ground surface datum of the test well and observation wells. After water was pumped at a rate of 13 liters/sec. for several days, water levels in the wells stabilized with the following drawdowns, 6.4 m. in the test well, 3.7 m. in the observation well 10 m. from the test well and 2.4 m. in the second observation well at a distance 30 m. From these data, o Find the depth of water in the test well. • Calculate the permeability of the aquifer. O Compute the transmissibility of the impermeable layer. 71-30 Ground surface 20 15m Water Leve intern 72=10 Static water level observation wall -impermeable confined aquifer hi hrQuestion 2 * A well with a diameter of 0.6 m is constructed in a confined aquifer. The sand aquifer has a uniform thickness of 15 m, overlain by an impermeable layer with a depth of 35 m. A pumping test was conducted to determine the coefficient of permeability of the aquifer. The initial piezometric surface was 15 m. below the ground surface datum of the test well and observation wells. After water was pumped at a rated of 13 liters/sec for several days, water levels in the wells stabilized with the following drawdowns, 6.4 m in the test well, 3.7 m in the observation well 10 m from the test well, and 2.4 m in the second observation well at a distance of 30 m. From these data: o Find the depth of the water in the test well Calculate the permeability of the aquífer.A 300 mm diameter test well penetrates 24 m. below the static water table. After 24 hours of pumping at 69 liters per second, the water level in an observation well at a distance of 96 m. from the test well is lowered by 0.60 and the other observation well at a distance of 34 m. from the test well, the drawdown is 1.2 m a) Compute the coefficient of permeability of the unconfined aquifer b) Compute the transmissivity of the unconfined aquifer.
- An confined aquifer has a thickness of 30m. a fully penetrating 20cm diameter well in this aquifer is pumped at a rate of 35 lit/s. the drawdown measured in two observation well located at distance of 10m and 100m from the well are 7.5m and 0.5m respectively. Determine the average hydraulic conductivity of the aquifer. At what distance from the well the drawdown is insignificant?2. A confined aquifer is recharged by a continuous supply of water from the certain source. The average thickness of the aquifer was determined to be 25 m and the average width is 4 km. The hydraulic conductivity of the aquifer was obtained at 40 m/day and its void ratio is 0.3333. The piezometer heads in two wells 1.325 km apart are 65 meters and 60 meters from a common reference datum. Determine the rate of flow in cubic meters per day. Determine: •compute the rate of flow through the aquifer in m3/day •compute the seepage velocity in m/day •compute the time of travel from the head of the aquifer to a point 8 km downstream in daysProblems An aquifer of 20m average thickness is overlain by an impermeable layer of 30m thickness. A test well of 0.5m diameter and two observation wells at a distance of 10m and 60m from the test well are drilled through the aquifer. After pumping at a rate of 0.1 m³/s for a long time, the following draw downs are stabilized in these wells. First observation well, 4m, second observation well, 3m. Show the arrangement in a diagram. Determine the coefficient of Permeability and the drawdown in the test well.