Question

Calculate the time required (in years) for water to penetrate a layer of clay that is 40 cm deep when exposed to a hydraulic gradient of 1 cm/cm. The permeability of clay is 1x10-8 cm/sec. If there is 30 cm static head of water on the clay layer, how long will it take for moisture to penetrate the 40 cm clay layer (in years)?

Answer 1

Answer:

The time required to penetrate the 40 cm clay layer is 126.82 years

Explanation:

Given:

Hydraulic gradient = 1 $\frac{cm}{cm}$

Permeability of clay $K = 1 \times 10^{-8}$ $\frac{cm}{sec}$

Time required to penetrate 40 cm clay layer,

  $= \frac{40}{K}$

  $= \frac{40}{1 \times 10^{-8} }$

  $= 40 \times 10^{8}$ sec

But we have to find time in years,

  $= \frac{40 \times 10^{8} }{24 \times 60 \times 60 \times 365}$ years

  $= 126.82$ years

Therefore, the time required to penetrate the 40 cm clay layer is 126.82 years

Answer 2

Answer:

its a

Explanation: