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. Apumping 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 steadystate (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.)kcm/s

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Answered: A site consists of a homogeneous dense…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Hydrology engineering Q3. An unconfined aquifer has a thickness of 30m . A fully penetrating 20cm diameter well in this aquifer is pumped at a rate of 35 liter/ sec. . the drawdown measured in two observation wells 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?
1. (30 pts) The soil profile shown below consists of 10 meters of sandy silt overlying gravel. The pore water pressure at the top surface of the silty sand is zero and can be assumed to remain zero. a) Calculate the level to which water would rise in a piezometer tube inserted into the top of the gravel if the silty sand is just stable? Use submerged unit weights and seepage forces to arrive at your answer (do not calculate total stresses and pore water pressures). Express your answer as an elevation, e.g. "Elev. 130". (Note: Elevations are in meters) (10 pts) b) Using the piezometric elevation calculated in part (a), calculate the pore water pressure at the bottom of the silty sand if the silty sand is just stable (10 pts). c) Calculate the total stress at the base of the silty sand and show that it is equal to the pore water pressure calculated in part (b) (10 pts) Elev. 120 m. Elev. 110 m. Sandy Silt (saturated) Void ratio, e = 0.68 G = 2.65 Gravel
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A field pumping test was conducted from an aquifer of sand soil of 4 m thickness confined between two impervious strata. When equilibrium was established, 90 liters of water was pumped out per hour. The water elevation in an observation well 3.0 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.
Determine the following: a) depth of water in the test well is ______ m b) Transmissbility of the impermeable layer is _____ sq.m/s c) Permeability of the aquifer is ____ m/s
Answer in three decimal places please
A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping is 2.17 m. below the ground surface. The aquiclude (impermeable layer) has a thickness of 5.59 m. measured from the ground surface and the confined aquifer is 7.6 m. deep until it reaches the aquiclude (impermeable layer) at the bottom. At a steady pumping rate of 15.1 m³/hour the drawdown in the observation wells. were respectively equal to 1.65 m. and 0.47 m. The distances of the observation wells from the center of the test well were 16 m. and 30 m. respectively. Compute the depth of water at the farthest observation well. Compute the transmissibility of the impermeable layer in cm²/sec.
b. An aquifer with a potentiometric surface is 50 m thick and 500 m wide. Two observation wells are located 1400 m apart in the direction of flow. Head in the first well is 50m and in the second well is 42m. Hydraulic conductivity is 0.7 m/d. Effective porosity of the medium is 20%. Determine the total flow of the water through the aquifer. Also determine the actual groundwater velocity between the two wells.
Assume a chemical solvent, which is denser than water is spilled into the reservoir. How many days will it take for the contaminant to reach the observation well assuming only advection occurs in the aquifer? The stratum has a hydraulic conductivity of 4 x 10-² cm/sec The silty sand in the aquifer has a void ratio of 0.75. Observation well↓ el. 167.3 m Reservoir Clay Silty sand Clay 256 m el. 165.0 m 3.2 m
The discharge from a fully penetrating well operating under steady state in a confinedaquifer of 35 m thickness is 2000 lpm. Values of drawdown at two observation wells 12 and 120 m away from the well are 3.0 and 0.30 m respectively. Determine the permeability of the aquifer.

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