Floating Islands Part 6: Stream rehabilitation

30 September 2011

BioHaven floating islands provide a powerful and effective tool for permanent or temporary stream rehabilitation.

Islands being planted for use in a damaged and regraded streambed

The islands will do the work while the stream recovers

Islands establishing in the newly-functional stream

Islands, doubling as walkways, providing high-capacity treatment in concrete urban canals

2 Responses to Floating Islands Part 6: Stream rehabilitation

  1. Karim Amani says:

    Very Interesting
    Can we growing rice in this system?
    Kind regards
    Karim Amani
    Anzali Port

    • Bill Harding says:

      FII have done a series of plant tests, both at Billings and at a regional nursery in western Montana. The nursery was able to grow a wide range of wetland plants, as well as terrestrials. In general, we have found that wetland plants, including submerged forms, do well on islands. We have designed islands to provide a submerged zone when applicable, although maintaining such a zone as biofilm develops can be challenging…since biofilm tends to add buoyancy. So as biofilm develops buoyancy can increase. (We frequently use rock as negative buoyancy to compensate.)

      Some terrestrials, including a wide range of grasses, do well. Again in general, if there is enough dissolved oxygen in the saturated zone of an island, or if the plants are established above the saturated zone and receive sufficient rainfall, they do well. I’ve been told that even cactus will grow hydroponically given sufficient dissolved oxygen. The use of BioHavens to grow vetiver grass in South Africa is being looked at.

      We are of the opinion that rice would be a natural for propagation on an island.

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