Determine the depth to bedrock for a dam site investigation. Determine the velocity of the overburden and the bedrock. Geophone 1 is 20m from the shot point and each geophone is 20m from the next. (A) Critical distance. .m? (B) Velocity of overburden..m/s? (C) Velocity of bedrock..m/s? (D) Depth to bedrock..m? Geophone 1st Arrival time (seconds) 1 0.015 2 0.031 0.046 4 0.062 0.077 0.089 7 0.094 8. 0.099 9. 0.105 10 0.110 11 0.115 12 0.121

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Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.