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Users can search and retrieve the enlistment records through the Access to Archival Database (AAD) resource. Before using AAD, we recommend that the user read the "Getting Started Guide" on the AAD home page. The Frequently Asked Questions developed especially for the World War II Army Enlistment Records File also provide a number of helpful tips and hints about technical data characteristics of various fields.
5. Piping is when seepage through a dam is not properly filtered and soil particles continue to progress and form sink holes in the dam. [See an animation of a piping failure.] Another 20% of U.S. dam failures have been caused by piping (internal erosion caused by seepage). Seepage often occurs around hydraulic structures, such as pipes and spillways; through animal burrows; around roots of woody vegetation; and through cracks in dams, dam appurtenances, and dam foundations.Click Here for Video Example [YouTube] 2b1af7f3a8