Surcharge

An additional load placed atop existing earth or dead loads. Often used in connection with retaining walls.
An extra excessive vertical load or weight caused by spoil, overburden, vehicles, equipment, or activities that may affect stability.
An extra and usually excessive burden or supply.
To overload or make beyond capacity a sanitary sewer system. If large enough, a surcharge will result in an overflow.
An increase in flood elevation due to obstruction of the floodplain that reduces its conveyance capacity.

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