Efforts to address nonpoint source nutrient loads associated with urban stormwater runoff have resulted in a wide range of alternative stormwater management strategies being developed. Integration of wetland vegetation along the shoreline of wet detention basins have often been promoted to improve water quality, vegetative diversity, wildlife habitat, aesthetics and reduce the development of filamentous algae along the littoral shelf. However, many stormwater ponds have a limited area available for establishment of emergent plants due to steep slopes or bulkheaded shorelines and the middle of the ponds are often too deep for most emergent wetland plant species to become established.
By providing an artificial floating substrate, just about any plant that can tolerate their roots being inundated can become established. The only limitation for growth then becomes the nutrient concentrations in the water column and that is the premise behind using artificial floating substrates planted with wetlands species to take up nutrients from the water column into plant tissue, harvest the plant biomass and thereby remove nutrients from the water column.
http://soils.ifas.ufl.edu/department/newsletters/Spring_2011_MYAKKA_Newsletter.pdf
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