During the maintenance of an earthen dam, the apparent seepage through the foundation of the dam is best taken care of by providing ______________________
a) chimney drain
b) rock toe
c) drain trench along the downstream toe
d) upstream impervious cut-off
Q.2.
The base width of a rock-fill dam in comparison to that of an earthen dam is _______________
a) much larger
b) much smaller
c) sometimes large sometimes smaller
d) almost equal
Q.3.
On moderate foundations and particularly in seismic areas, the type of dam which can preferably be considered for construction is ___________________
a) masonry gravity dam
b) earthen dam
c) rock-fill dam
d) arch dam
Q.4.
According to Terzaghi, the ratio of Dof filter to Dof base material should be _____________
a) > 5
b) < 4
c) 4 to 5
d) < 5
Q.5.
Which of the following is not provided in order to control the possibility of sand boiling?
a) Relief wells
b) Drain trenches
c) Vertical cut-offs
d) Berms
Q.6.
The seepage forces within the filter are controlled up to permissible small magnitudes when the ratio of Dof filter to Dof base material is ___________________
a) between 5 to 40
b) less than 5
c) between 5 to 20
d) less than 4
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