A soil sample 12 cm in diameter is placed in a tube 1 m long. A constant supply of water is allowed to flow into one end of the soil at A, and the outflow at B is collected by a beaker. The average amount of water collected is 2.5 cm3 for every 5 seconds. The tube is inclined as shown in the Figure . Determine the :

The figure below is a constant-head permeability test device. The cross-sectional area of the sample is 120 cm2. After 10 seconds, the volume of water flowing through the soil sample is 150 cm3. What is the coefficient of permeability of the soil sample? What is the hydraulic gradient and seepage force of the seepage flow?

ANSWER THE FOLLOWING QUESTION. SHOW COMPLETE SOLUTION. H = 1.98 Hydraulic conductivity of soil E is 0.002 m/s.

Water flows through a sand filter as shown on the figure. The soil has a cross sectional areaof 0.25 m2. 1. Compute the coefficient of permeability of the sand filter in cm/s. 2.Compute the flow of water through the soil in liters/sec. 3. Compute the interstitial velocity if the soil has a void ratio of 0.71 in meters per minute.

Prob. In a constant head permeability test following results observed - Distance between piezometer tappings = 100 mm Difference of water levels in piezometers = 60 mm Diameter of test sample = 100 mm Quantity of water collected = 350 ml in 270 sec Determine the coefficient of permeability of the soil.

In a constant head test, the sample of sand was collected 150 cm3 of water in just two minutes. The diameter is 5.08 centimeters, the length was 10 centimeters, and the head was maintained at 20 cm. 1) Determine the coefficient of permeability (Ans. 3.08 x 10-2 cm/s) 2) Determine the kind of soil (Ans. Coarse Sand) 3) Determine the interstitial velocity if n=0.3 (Ans. 0.21 cm/s)

Problem 2.61

Question 3 4 pts Assuming the groundwater table is at ground surface and the soil bulk unit weight is 20KN/m3. At 2m depth below ground level. The pore water pressure is approximately: 200 kPa O 9.8 kPa O 98 kPa O 19.6 kPa Question 4 4 pts A soil sample is placed in a 1m long and 10cm diameter tube. A constant supply of water is allowed to flow from inlet to outlet. The total water head at the inlet is 2m and the total water head at the outlet is 1m. The hydraulic conductivity is 0.001 cm/s. Which of the following answer is correct? O The flow velocity is 25 cm/s O The hydraulic gradient in the tube is 2 O The flow velocity is 0.001 cm/s O The hydraulic gradient in the tube is 0.001

(CE Board Exam November 2018) An experiment to determine the permeability of a soil sample was conducted. The permeameter in a falling head permeability test set-up involves a cylindrical soil sample 100mm in diameter and a height of 200mm. The hydraulic head in the 10-mm diameter standpipe through which the test water passed drop from 1m to 600mm in one minute of observation. In that duration, the water collected in the graduate was recorded at 2L. From these data, a. Evaluate the coefficient of permeability of the soil sample in cm/sec b. Determine the time it takes for the water to drop from 1meter to 750mm c. What will be the hydraulic head in the standpipe after 2 minutes

8. The figure shows the layers of soil in a tube that is 100 mm x 100 mm in cross section. When supplied to maintain a constant head difference of 300 mm across the sample. The hydraulic conductivity of the soils in the direction to flow to them are as follows: Soil A = 2 x 10 ^ -2 cm/sec Soil B = 3 x 10 ^ -3 cm/sec Soil C = 4 x 10 ^ -4 cm/sec (See picture below) Find the equivalent hydraulic conductivity Find the hydraulic gradient Find the rate of water supply in cm3/hr.