SOIL MECHANICS $-$ FLOW NET PROBLEM

GIVEN: The cross$-$section of a concrete gravity dam constructed on a layer of medium permeability clay as shown in the diagram below.

REQUIRED:

Draw the cross$-$section to scale. Make sure to note what scale you use. The flow net should fit on a single piece of ${8\mathrm{.}5}^{\text{'}\text{'}}{11}^{\text{'}\text{'}}$ paper.

Draw the flow net. Use four flow channels;

Calculate the seepage rate in liters per day per meter of width;

Calculate the exit gradient. Explain in detail why liquefaction will or will not occur at the downstream end and dam;

Calculate the pore pressure $($in kPa $)$ at points A through M $.$ Points A through G are equally spaced at $18$ m $.$ Points $D,$I and L are located directly below the center of the dam;