Floating Treatment Wetlands BMP Expert Panel Report
Recommendations of the Expert Panel to define removal rates for floating treatment wetlands in existing wet ponds.
Description
Floating treatment wetlands (FTWs) are rafts of wetland vegetation that are deployed in stormwater ponds with a permanent pool of water. The panel classified them as a variant of the BMP enhancement retrofit category, as defined by the retrofit expert panel. FTW retrofits can be installed on existing wet ponds with a contributing drainage area of 400 acres or less. The panel also defined general performance criteria for FTW retrofits that need to be met to earn credit. The panel reviewed FTW research which included field monitoring studies, mesocosm studies, and engineering models. Recommendations from the expert panel are outlined in this report.