Estimate the hydraulic conductivity of an unconfined aquifer from the following pump test data and determine what material most probably it would be: - depth to restrictive layer: 21 m - depth to static water table: 4 m - drawdown at 10-m radius: 8 m - drawdown at 50-m radius: 1.2 m - well discharge: 6 L/s

Estimate the hydraulic conductivity of an unconfined aquifer from the following pump test data and determine what material most probably it would be: - depth to restrictive layer: 21 m - depth to static water table: 4 m - drawdown at 10-m radius: 8 m - drawdown at 50-m radius: 1.2 m - well discharge: 6 L/s

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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B. Under certain conditions the Thiem equation (5-43) for confined aquifers, is equivalent to the Cooper-Jacob equation (5-58) for confined aquifers. What are the conditions? (This exercise is easier than Problem A.) C. If an analysis is made of the hydraulic conductivity of a site using permeameter tests of core samples, slug tests of monitoring wells, and pumping tests of production wells, it is often observed that the hydraulic conductivity as measured by each method is different. Which method would be most likely to have the greatest hydraulic conductivity, and which the least? What are some possible reasons why this would be true?
An unconfined aquifer is 100 feet thick was evaluated using a field pumping test. The depth to groundwater is 10 feet. At a distance of 1000 feet, the drawdown was 40 feet, and at a distance of 5000 feet it was 20 feet. Find the permeability of the aquifer assuming that a steady-state of 960 gal/minute during the test in ft/sec.
A sand sample of 35m cm^2 cross sectional area and 20cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 ml in 6min. The dry weight of sand used for the test was 1120 g, and Gs= 2.68 A. Determine the hydraulic conductivity in cm/sec. B.Determine the discharge velocity in cm/sec. C. Determine the seepage velocity in cm/sec.
A sand sample of 35 sq. cm cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 ml in 6 min. The dry weight of sand used for the test was 1120 g, and Gs = 2.68 1. Determine the hydraulic conductivity in cm/sec. 2. Determine the discharge velocity in cm/sec 3. Determine the seepage velocity in cm/sec
← Darcy' Law A sand sample of 35 m² cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 km, the discharge was 120 ml in 6 min. The dry unit weight of sand used for the test was 1120 g. and GS = 2.68 Take Sw = 1 g/ cm³ The hydraulic conductivity (in cm/sec) is × 10-³ X
Problem (4) The following results have been reported for field pumping test from a well, where the top permeable layer is unconfined and underlain by an impermeable layer, for a steady state condition: m3 q = 0.68 min h, = 5.6m at r, = 60m h, = 5m at r, = 30m Calculate the hydraulic conductivity (cm/s) of the permeable layer.
Don't copy from other solutions thank you. Three piezometers have been installed in the confined aquifer having a uniform thickness of 4.6 m. and hydraulic conductivity of 2 x 104 m/s. a) Compute the hydraulic grądient. b) Compute the transmissivity in m2/day. c) Compute the flow rate per unit width of the aquifer in liters/day.
1. A sand sample of 35 cm² cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 mL in 6 min. The dry weight of sand used for the test was 1120 g, and G₁ = 2.68. Determine (a) the hydraulic conductivity in cm/sec, (b) the discharge velocity, and (c) the seepage velocity.
(b) TABLE Q1(b) shows three layers of soil used in permeability pilot test. (i) Calculate the average vertical conductivity of the soil in cm/day. (ii) Calculate the transmissivity of the soil when water is at the ground surface. (iii) Discuss the factors that might affect the results obtained in Q1(b)(i) and Q1(b)(ii).
Calculate the equivalent hydraulic conductivity for the following soil sample: 1.5 ft Water O: K-2x10* ft/sec O: K=3x10* ft/sec O: K-4x10 ft/sec : K-5x10 ft/sec Water (2) 4 layers@ 0.5 ft thick each 10 ft O 0.00035 ft/sec O 0.00031 ft/sec O 0.00003
3.1 Construct IPR of a vertical well in an oil reservoir. Consider (1) transient flow at 1 month, (2) steady-state flow, and (3) pseudo-steady-state flow. The following data are given: Porosity, o = 0.25 Effective horizontal permeability, k = 10 md Pay zone thickness, h = 50 ft Reservoir pressure, pe or p = 5,000 psia Bubble point pressure, p, = 100 psia Fluid formation volume factor, B, = 1.2 Fluid viscosity, M. = 1.5 cp Total compressibility, c, = 0.0000125 psi- Drainage area, A = 640 acres (re = 2,980 ft) Wellbore radius, rw Skin factor, S = 5 0.328 ft
In a field testing, the hydraulic gradient between two peizometers is 1.11, the area of flow is 4.08 m2 and the hydraulic conductivity of the aquifer material is 0.94 m/day, calculate the discharge in m3/day. Note that discharge cannot be negative