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​Wetlands Epitomize How Nature Supports Lake Health, But Where Have All the Wetlands Gone?

6/7/2021

2 Comments

 

​A functional wetland, up watershed from a lake, can spell the difference between a healthy lake that’s resistant to Harmful Algae Blooms, and a lake that is both vulnerable to HABs and on its way out.

In this underwater photo, Bluegills are swimming among the roots hanging down from a floating island
Grow fish instead of algae: Bluegills swim among BioHaven roots, where they graze on periphyton
Such hyper-eutrophic lakes become shallower and even more vulnerable to near-monocultures of blue-green algae and cyanobacteria blooms, and related health risks.  Over and above these big negatives, recent climate science is quantifying that such lakes that regularly experience HABs are also methane emitters.  
For several dozen years, a new lake management tool has evolved.  Lake managers can restore natural wetland function using constructed wetlands.  Various forms of man-made wetlands fill in the gap caused by destructive development trends.  When combined with fishery enhancement and strategic fish harvest, constructed wetlands like floating treatment wetlands can actually reverse a lake’s trophic index.  Floating wetlands support fish growth; as they grow, the fish pull nutrients out of the water, and - as long as they are ultimately harvested - the lake is transitioned back to health.

Lake managers can now “grow fish instead of algae.”  Algae prevention instead of chemical treatment.  In fact, nutrient-rich water that is poised to experience suffocating HABs is a prime candidate for treatment by floating treatment wetlands, which actually are positioned on the target waterway.  They can certainly be located up watershed as well, where they will favorably influence inflow water quality.  But floating treatment wetlands, like the BioHaven, can be positioned directly on a target lake, where they compete for nutrients with blue-green algae and potentially deadly cyanobacteria, and contribute to fishery improvement in the process.
​
Strategically positioned islands can also provide wave mitigation and corresponding shoreline protection.  The BioHaven system has been proven internationally, and has withstood numerous hurricane events, with over 9,000 islands in place in both, fresh and marine water settings, from Alaska to Florida.  

Today the BioHaven brand is advancing into Water Resource Recovery (WRR), where island systems generate commercial volumes of solar energy which pay for large projects.  Such projects mean that even large water is treatable.   WRR systems can actually be aesthetic additions to water while enhancing a fishery.  And they can remove what is otherwise a public tax burden, as they mitigate and prevent disastrous algae blooms.  
Two women students are shown hauling and positioning solar batteries into place on a Biohaven dock
Engineering students from Montana State University assemble the battery components that form part of the solar power array
BioHavens now offer another game change option.  The islands can support state of the art aeration technology that reduces sludge buildup on the bottom of lakes.  This is the same sludge that otherwise results in methane emissions, which after residence time in atmosphere correction is some 25 times more impactful than carbon dioxide.  The company that originated BioHavens, Floating Island International, is currently testing and quantifying this game-changing advancement, working in partnership with Moleaer.  ​
The wetlands that have been historically taken out by real estate developers, that have been viewed as problems instead of vital, natural systems that warrant preservation, must always be preserved and recovered wherever possible.  But today constructed wetlands represent a versatile new ability to add nature’s wetland effect across the vast range of lake systems in North America.  Floating Island International is also bringing their BioHaven system to Europe and Asia, targeting water that represents vast greenhouse gas emissions.

Water quality is directly connected with climate health, and fixing water is a vital form of climate action.  The next step, motivating lake managers by providing carbon credit for methane mitigation, one more tool with which to incentivize effective lake management.

Lake health and climate health go hand in hand.  Water health and quality of life go hand in hand as well.  Clear water that is also productive, is both possible and smart.
2 Comments
alphasolutions link
5/14/2025 07:29:30 am

Urban waterbodies face unique challenges with runoff and stagnation. Our approach combines floating wetlands, sludge treatment, and low-energy aeration to revitalize even the most neglected ponds. Great to see these issues getting attention!

Reply
alphasolutions link
5/14/2025 07:32:19 am

Urban waterbodies face unique challenges with runoff and stagnation. Our approach combines floating wetlands, sludge treatment, and low-energy aeration to revitalize even the most neglected ponds.

Reply



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