1.

Projecting collars are provided on sides of a rectangular tunnel of length L made through an earthen dam to increase the seepage path. Their projection length (X) and numbers (N) are decided so as to provide increased seepage path equal to 2NX where 2NX should generally be ______________________

A. greater than L/4
B. greater than L/3
C. greater than L/2
D. greater than L
Answer» B. greater than L/3


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