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Seepage Piping/Internal Erosion <br />Accounts for roughly ~1/2 of all dam failures <br />Definition <br />•Uncontrolled movement of soil particles <br />caused by flowing water and <br />development of internal erosion by <br />seepage <br />Common Causes <br />•Seepage along penetrations through the <br />dam (ie: Conduit, rodent holes, cracks, <br />etc.) <br />•Uncontrolled seepage through <br />embankment and/or foundation