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The measurement is taken from the point above grade at which height the foundation will be at completion, taking into account the type of foundation material and the frost line, and the depth of the crawl space or basement, if any.
Real depth Dr= Apparent depth/ refractive index of water Dr= Da / n water
Wave speed = (wavelength) x (frequency) "Depth" (?) is not involved.
Length X Width X Depth = volume
26928 pebbles for the minimum depth.