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Mitigation Measures Worked

The system of storm-water mitigation measures worked as designed. The main elements of it were: • Bike paths and underpasses along the creeks to allow additional space for floodwaters; • Tear-away bridges designed to swing open like gates to allow water to pass without accumulating debris; • Rip-rap, pools, drops, other in-channel features constructed to slow floodwater and divert it back into the creek; • Prevention of further construction of critical infrastructure in the floodplain, and removal of high-hazard buildings in the floodplain prior to the flood; • Design of roads to carry flood waters into the storm-water drainage system; and • Open space which allowed creeks to overflow their banks with minimal damage to private property. All of these measures were in place for years before the flood, many serving other purposes such as recreation and transportation.

PERC Reports