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Shear Strength of Grouted Rip Rap Slope

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The purpose of weep holes in channel walls is two-fold.  The first purpose is 
as you discussed --- to keep hydrostatic pressure down.  The second purpose 
is to keep the channel from floating out of the ground, which you didn't 
discuss.  Don't forget to calculate buoyancy also.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona