4 m B B 4 m C E 1 m D 4 m 2 m 1 m B D Case I E 4 m 5 m 4 m C 4 m 1 m Case III Case II 1 m D E
Consider the three cases shown below, in which a soil column is subjected to different water heads (similar set-up
Darby’s experiment in the reader). Using the tables provided, establish the pressure, elevation, and total heads at
each location, considering that the datum is:
a) at the headwater, and
b) at the tailwater.
c) What was the effect of assuming a different datum on the i) pressure, ii) elevation, and iii) total heads?
d) In the schematic for each case, draw an arrow indicating the direction of water flow inside the soil.
e) What is the hydraulic gradient across the soil in each case?
f) If the soil permeability and cross-sectional area of the cylinder remains constant across the different cases, which
one leads to the largest flow rate q? Which one has the lowest flow rate?
g) What assumptions were necessary for you to answer these questions?
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