Want to implement this?

Figure out how many wetlands you would need for your body of water below!

To help others adapt this floating wetland design to any body of water, we can use a simple equation that calculates the recommended coverage area based on the total surface area of the waterbody.


Let:

  • Aₜ = total surface area of the waterbody (m²)

  • Aᵢ = total surface area of floating wetland islands (m²)

  • C = coverage percentage (as a decimal), for optimal results we recommend 18% coverage


Then:
Aᵢ = Aₜ × C


Based on research and performance guidelines, C should generally fall between 0.05 and 0.25 (i.e. 5–25% of the waterbody surface). For example:

  • Use C = 0.05 (5%) for minimum treatment effect

  • Use C = 0.10–0.15 (10–15%) for moderate nutrient removal

  • Use C = 0.25 (25%) for maximum treatment without risking oxygen depletion

  • Never exceed C = 0.50 (50%), as this may reduce dissolved oxygen levels too much


To adapt this to the modular hexagonal design, divide Aᵢ by the area of one hexagonal unit (e.g. 52 m²) to determine how many modules are needed:


Let:

  • Aₘ = area of one module (m²)

  • N = number of modules


Then:
N = Aᵢ / Aₘ


This lets designers scale the system up or down based on their local waterbody size, while staying within safe and effective coverage thresholds.

© 2025 Dow's Lake Floating Wetlands: A Scalable Model for Urban Ecological Restoration by Reema Adan, Sharon Chen, Ella Gem DeFrancisco, Eva Domond, Calvin Elisen, Madison Lucente, Donya Nadoushan, and Marina Spitz is licensed under CC BY-NC-SA 4.0
© 2025 Dow's Lake Floating Wetlands: A Scalable Model for Urban Ecological Restoration by Reema Adan, Sharon Chen, Ella Gem DeFrancisco, Eva Domond, Calvin Elisen, Madison Lucente, Donya Nadoushan, and Marina Spitz is licensed under CC BY-NC-SA 4.0
© 2025 Dow's Lake Floating Wetlands: A Scalable Model for Urban Ecological Restoration by Reema Adan, Sharon Chen, Ella Gem DeFrancisco, Eva Domond, Calvin Elisen, Madison Lucente, Donya Nadoushan, and Marina Spitz is licensed under CC BY-NC-SA 4.0