for Nutrient & Sediment Control
For stormwater management, BioHaven floating islands efficiently treat runoff while delivering quality-of-life benefits.
They act like a natural wetland, increasing the aesthetic value and wildlife abundance of any stormwater pond and farm pond. Easily installed, they protect the environment from harmful pollutants and sediments carried downstream by urban, industrial and agricultural runoff. In many US states, BioHaven Floating Islands have been approved as a BMP and can be used to gain nutrient credits.
Floating Islands for Stormwater Management
How Scientists Describe Floating Wetlands
BioHaven Floating Islands employ rooted, emergent macrophytes (similar to those used in surface and subsurface flow wetlands) growing as a floating mat on the surface of the water rather than rooted in the sediments. They tolerate wide fluctuations in water depths that are typical of stormwater systems. The plant roots hanging beneath the island provide a large surface area for biofilm growth and entrapment of fine suspended particulates that would otherwise remain in suspension in a pond system. Because the plants are not rooted in the sediment, they are forced to acquire their nutrition directly from the water column, which enhances potential rates of nutrient and element uptake into biomass.
It’s all about the matrix
The heart of the BioHaven solutions is the permeable, tiny fibers of the proprietary matrix, together with mature plants and extensive roots that grow through them. Together, they make up a massive surface area that supports the growth of biofilm, a sticky substance that contains the microbes responsible for treating pollutants in stormwater. Through the processes of organic digestion, particle settlement, filtration, adsorption and direct uptake, BioHavens can treat oil and grease, excess nutrients and heavy metals such as copper and zinc. Put another way, pollutants are circulated through the islands and glom on to the sticky biofilm covering the root surfaces and island matrix. They either fall off into the sediments below when they get too heavy or are digested by the incredible food web inside the island and the plant-root mass.
Minimal Environmental Impact
BioHaven treatment approach to stormwater management requires zero land use, and has many other environmental benefits: