Question

In a constant head permeameter with cross-section area of 10$c{m}^2$ , when the flow was taking place under a hydraulic gradient of 0.5, the amount of water collected in 60 s is 600 cc. The permeability of the soil is

• A. 0.002 cm/s
• B. 0.25 cm/s
• C. 0.2 cm/s
• D. 2.0 cm/s

Answer 1

The correct option is D 2.0 cm/s

Amount of water collected in 60s is 600cc

$Discharge,Q=\frac{600}{60}$

= 10 cc/sec

hydraulic gradient, i = 0.5

Q = kiA

10 = k $\times$ 0.5 $\times$ 10

$\Rightarrow k=2cm/s$