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PtichkaEL [24]
3 years ago
13

In a constant-head permeability test in the laboratory, the length of the soil specimen is 275 mm and its cross sectional area i

s 125 cm2. If the permeability of the soil is 0.012 cm/sec, and a flow rate of 150 cm3/min must be maintained through the soil specimen, determine the head difference across the soil specimen and the discharge velocity
Engineering
1 answer:
sattari [20]3 years ago
8 0

Answer:

The head difference across the soil specimen is 39.29 cm and the discharge velocity is 0.02 cm/s

Explanation:

The head difference across the soil specimen is:

k=\frac{QL}{Aht}

Where

k = hydraulic conductivity = 0.014 cm/s

Q = volume of water collected = 150 cm³/min = 2.5cm³/s

L = length of the soil specimen = 275 mm = 27.5 cm

A = area = 125 cm²

Replacing:

0.014=\frac{2.5*27.5}{125*h*1} \\h=39.29cm

The hydraulic gradient is:

i=\frac{h}{L} =\frac{39.29}{27.5} =1.43

The discharge velocity is:

v = k*i = 0.014 * 1.43 = 0.02 cm/s

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