A constant head permeability test is carried out on a cylindrical sample of sand 10 cm diameter and 15 cm height 160 cm3 of water is collected in 1.75 minutes, under a head of 30 cm, What is the coefficient of permeability in m/year !
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- Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/minFor a falling-head permeability test, the following are given:length of specimen = 380 mmarea of specimen = 6.5 cm2k = 0.175 cm/minWhat should be the area of the standpipe for the head to dropfrom 650 cm to 300 cm in 8 min?For a falling head permeability test find the value of permeability in (mm/sec) if the initial height of water 1500mm, final height 605mm, time of the test 281 sec, length of the sample 150 mm, diameter of the sample 100mm and diameter of the stand pipe 5mm.
- For a variable head permeability test. the following values are given: length of specimen = 380 mm, area of specimen = 19.4 cm2 k = 2.92 ( 10-3 cm/sec. What should be the area of the standpipe for the head to drop from 640 to 310 mm in 8. min?GEOTECHNICAL COMPLETE SOLUTION PLS For a falling-head permeability test, the following are given: length of specimen = 15.1 in., area of specimen = 3.9 in^2, and k = 0.0686 in./min. What should be the area in sq. in. of the standpipe for the head to drop from 25.1 to 12.6 in. in 8.9 min. ?The following data relate to a pump-out test: Diameter of well = 24 cm; Thickness of confined aquifer = 27 m; Radius of circle of influence = 333 m; Draw down during the test = 4.5 m; Discharge = 0.9 m^3/s.What is the permeability of the aquifer in mm/s? Choices: a. 2.15 x 10^-2 b. 4.5 x 10^-1 c. 93 X 10^-1 d. 1.6 X 10^-1
- Situation 1 – Refer to the picture. 1. Assume 3K1=K2=1.5K3=2K4 K1=3.5x10-2 (cm/s) Calculate the equivalent coefficient of permeability. 2. Assume 3K1=K2=1.5K3=2K4 K1=3.5x10-2 (cm/s) Calculate the rate of seepage 3. Assume 3K1=K2=1.5K3=2K4 K1=3.5x10-2 (cm/s) Calculate the height of water above C if piezometer was placed at that pointThe data from a falling head test is shown. Diameter of standpipe: 5 cm. Initial Head: 92.45 cm. Duration of test: 14 min. Length of soil sample: 32.29 cm. Diameter of permeameter: 44 cm. If the soil permeability is 0.0056 cm/min, determine the final head (in cm.) of the permeability test. Round off to two decimal places.Determine the coefficient of permeability in mm/s from the following data:Length of sand sample = 25 cm;Area of cross section of the sample = 30 cm2; Head of water = 40 cm; Discharge = 200 ml in 110 s a.0.3788 b.0.750 c.0.106 d.1.23 x 10^(-2)
- 34 For a falling head permeability test, the following values are given: Length of specimen = 38.74 cm, Area of specimen = 19.58 cm^2, and k = 2.82 x 10^-3 cm/sec. What should be the area (in cm^2) of the standpipe for the head to drop from 64 cm to 30 cm in 8.6 minutes? Round off to three decimal places.A drainage pipe beneath a dam has clogged with sand whose coefficient ofpermeability is found to be 8.0 meters per day. The average difference inheadwater and tailwater elevation is 21.6 meters and it has been observed thatthere is a flow of 162 liters per day through the pipe. The pipe is 96.3 meterslong and has a cross-section area of 180 sq. cm. What length of the pipe isfilled with sand?The data from a falling head test is shown. Diameter of standpipe: 5 cm. Initial Head: 92.68 cm. Duration of test: 19 min. Length of soil sample: 30.64 cm. Diameter of permeameter: 43 cm. If the soil permeability is 0.008 cm/min, determine the final head (in cm.) of the permeability test. Answer: 64.22