A long drain pipe is installed below ground as shown in the figure below. The flow net for the steady state seepage from the ground surface to the pipe during rainfall is shown in the figure. The soil is a silty sand having a coefficient of permeability of 5×10-5m/s and a total unit weight of 18 kN/m³.

a) What is the vertical effective stress in the soil at Point X?
b) At what rate, in m³ /s per meter run of the pipe, does the pipe collect the rainwater seepage?

Transcribed Image Text:

3m Rainfall 2.5m Point X 3m Rainfall 2.5m Point X

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