Ponding is a condition prevalent with flat, built-up roof systems where there are drainage issues but it is not a term solely used on roofs, it can be used to describe water pooling in a parking lot, too.
According to the Construction Dictionary, 9th Edition © 2001 published by the Greater Phoenix, Arizona Chapter #98 of the National Association of Women in Construction lintel is defined as follows:
(1) Curing method for flat surfaces whereby a small earth dam or other water-retaining material is placed around the perimeter of the surface and the enclosed area is flooded with water. (2) The gathering of water at low or irregular areas on a roof.
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