v. Simple past tense and past participle of surcharge.
The Century Dictionary and Cyclopedia
Overloaded; overburdened; charged in excess, in any way.
Word Usage
"New York City's storm and sanitary sewers are part of a single combined system, so when that system becomes "surcharged," stormwater (and yes, some sewage) starts to rise up into our downstairs tub and geysers out of the toilet."