Need help with C.8. An aquifer has a hydraulic conductivity of 12 ft/dand an effective porosity of 17% and is under ahydraulic gradient of 0.0055.(A) Compute the specific discharge.(B) Compute the average linear velocity.(C) The water temperature is 14°C and the mean porediameter is 0.33 mm. Is it permissible to useDarcy's law under these circumstances? What isthe reason for your answer?

Find velocityv=Knedhdlv=12ftday0.170.0055=0.388ftd

Answered: The water temperature is 14°C and the…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.1P

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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.
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?
Determine the following: a) hydraulic conductivity is ______ x10^3 cm/sec b) Transmissbility of the impermeable layer is _____ cm^2/sec c) The drawdown in the test well is ____ m
(a) A stratified aquifer has a total thickness of 30 m and is made up of three layers. The top layer has a coefficient of permeability of 20 m/day and a thickness of 12.0 m. The middle and bottom layers have permeability of 15 m/day and 20 m/day respectively and are of equal thickness. Calculate the following:
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.
2. An aquifer has a hydraulic conductivity of 180 ft/day, and effective porosity of 33% and is under a hydraulic gradient of 0.0004. a) Compute the Darcy velocity (also called Darcy flux). b) Compute the actual velocity (also known as the average linear velocity). c) The water temperature was 14 Degree C, and the mean pore diameter was 0.30 mm. d) Was it permissible to use Darcy's law under these circumstances? e) What is the reason for your answer?
Given the required grout hydraulic head is 10 m, the head of the grout pipe is 1.5m above the ground. The injection point is at a depth of 4 m. The groundwater is 2m above the injection point. Calculate the required grout pressure.
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.
Direction: Choose A - When both statements are true; B - When both statements are false; C- When the first statement is true and the second statement is false; D- When the first statement is false and the second statement is true. First Statement: Seepage velocity is just the ratio of the porosity to the Darcy velocity. Second Statement: The hydraulic gradient of an aquifer is positive when the groundwater flows from a point with higher head to another point with lower head.
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.
(i) Determine the hydraulic conductivity of the soil (m/sec)(ii) What was the head difference at t = 5 minutes?
2. The following description is correct ( ).A. the denser the grid in the flow network, the smaller the hydraulic gradientB. two points on the same equipotential line, the pore water pressure is always the sameC. the same flow network, any two adjacent equipotential line between the potential energy difference is equalD. The direction of the infiltration flow rate is the direction normal to the flow line 3. In the triaxial shear test, the test that keeps the pore pressure of the soil sample at zero throughout the process from the application of the circumferential pressure until the soil sample is damaged is ( ).A. Unconsolidated undrained test B. Consolidated drained testC. Solidification without drainage test D. Solidification fast shear test

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