Drain tiles and protective coating materials that were installed during original construction to protect your basement will break down over time. This is caused by the expansion and contraction of the basement walls and hydrostatic pressure which is created when the ground becomes saturated. The drawing below shows the A, B, C’s of hydrostatic pressure.
		A    When it rains, the ground becomes saturated on the surface and soaks into the soil. B     During heavy rains the water table rises toward your basement which creates more hydrostatic pressure. C     As the ground becomes saturated and the water table rises, the soil becomes heavy and expands similar to the way a dry sponge expands and becomes heavy when saturated. This creates up to 500 lbs. per square inch of hydrostatic pressure, which forces mud and silt into the outside drain tile causing it to clog or collapse.
	As the ground expands under hydrostatic pressure, the water searches for the path of least resistance and can enter your basement as follows: