Changes

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"Lands that are seasonally or permanently flooded by shallow water as well as lands where the water table is close to or at the surface; in either case, the presence of abundant water has caused the formation of hydric soils and has favoured the dominance of either hydrophytic or water-tolerant plants. The four major types of wetlands are swamps, marshes, bogs, and fens."<ref>Ontario Ministry of Natural Resources and Forestry. 2017.

"Lands that are seasonally or permanently flooded by shallow water as well as lands where the water table is close to or at the surface; in either case, the presence of abundant water has caused the formation of hydric soils and has favoured the dominance of either hydrophytic or water-tolerant plants. The four major types of wetlands are swamps, marshes, bogs, and fens." (MNRF, 2017)<ref>Ontario Ministry of Natural Resources and Forestry. 2017. A Wetland Conservation Strategy for Ontario 2017–2030. https://www.ontario.ca/page/wetland-conservation-strategy</ref>

A Wetland Conservation Strategy for Ontario 2017–2030. https://www.ontario.ca/page/wetland-conservation-strategy</ref>

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{{textbox|Wetlands can contribute to<ref>Toronto and Region Conservation Authority. 2025. Wetlands. https://trca.ca/conservation/restoration/wetlands/#:~:text=Increased%20biodiversity,as%20bird%20watching%20and%20fishing</ref><ref>Bendoricchio, G., L. Dal Cin, and J. Persson. 2000. Guidelines for free water surface wetland design. EcoSys Bd 8: 51–91. http://www.pixelrauschen.de/wet/design.pdf</ref>:

{{textbox|Wetlands can contribute to (TRCA, 2025; Bendoricchio, 2000)<ref>Toronto and Region Conservation Authority. 2025. Wetlands. https://trca.ca/conservation/restoration/wetlands/#:~:text=Increased%20biodiversity,as%20bird%20watching%20and%20fishing</ref><ref>Bendoricchio, G., L. Dal Cin, and J. Persson. 2000. Guidelines for free water surface wetland design. EcoSys Bd 8: 51–91. http://www.pixelrauschen.de/wet/design.pdf</ref>:

*Enhancing biodiversity

*Enhancing biodiversity

*Improving water quality and helping to meet TSS reduction targets

*Improving water quality and helping to meet TSS reduction targets

*Storing water and attenuating floods

*Storing water and attenuating floods

*Enhancing recreational and educational opportunities and aesthetics

*Enhancing recreational and educational opportunities and aesthetics

*Carbon sequestration<ref>Kennedy, G., and T. Mayer. 2002. Natural and Constructed Wetlands in Canada: An Overview. Water Qual. Res. J. Canada 37(2): 295–325. doi: 10.2166/wqrj.2002.020.</ref>}}

*Carbon sequestration (Kennedy, 2002)<ref>Kennedy, G., and T. Mayer. 2002. Natural and Constructed Wetlands in Canada: An Overview. Water Qual. Res. J. Canada 37(2): 295–325. doi: 10.2166/wqrj.2002.020.</ref>}}

==Planning considerations==

==Planning considerations==

Constructed wetlands differ based on how water travels through the system<ref>Grant, N., M. Moodie, and C. Weedon. 2000. Sewage Treatment Solutions. p. 35–67. In Sewage Solutions: Answering the Call of Nature. Centre for Alternative Technology Publications.</ref><ref name="EPA">United States Environmental Protection Agency. 1995. A handbook of constructed wetlands: A guide to creating wetlands for agricultural wastewater, domestic wastewater, coal mine drainage and stormwater.</ref><ref name="JW">Jacques Whitford Consultants, 2008. Constructed and engineered wetlands. p. 1-21</ref>:

Constructed wetlands differ based on how water travels through the system (Grant, 2000; USEPA, 1995; Jacques Whitford Consultants, 2008)<ref name ="Grant">Grant, N., M. Moodie, and C. Weedon. 2000. Sewage Treatment Solutions. p. 35–67. In Sewage Solutions: Answering the Call of Nature. Centre for Alternative Technology Publications.</ref><ref name="EPA">United States Environmental Protection Agency. 1995. A handbook of constructed wetlands: A guide to creating wetlands for agricultural wastewater, domestic wastewater, coal mine drainage and stormwater.</ref><ref name="JW">Jacques Whitford Consultants, 2008. Constructed and engineered wetlands. p. 1-21</ref>:

*Free-water surface flow wetlands have water exposed on the surface, which provides excellent water quality treatment but may pose health and safety risks. Free-water surface flow wetlands are most commonly employed for stormwater treatment and are similar to [[SWM ponds]] in function and design. However, ponds and wetlands differ by the extent to which shallow zones for wetland [[plants]] are incorporated. A facility is normally characterized as a wet pond if shallow zones (<0.5 m deep) comprise less than 20% of its surface area, while a facility is normally characterized as a wetland if shallow zones (<0.5 m deep) make up more than 70 % of its volume. Unlike SWM ponds and constructed wetlands, [[Dry ponds|dry ponds]] are designed to temporarily store stormwater runoff and completely drain out between storm events and focus more on flood attenuation than treatment.

*Free-water surface flow wetlands have water exposed on the surface, which provides excellent water quality treatment but may pose health and safety risks. Free-water surface flow wetlands are most commonly employed for stormwater treatment and are similar to [[SWM ponds]] in function and design. However, ponds and wetlands differ by the extent to which shallow zones for wetland [[plants]] are incorporated. A facility is normally characterized as a wet pond if shallow zones (<0.5 m deep) comprise less than 20% of its surface area, while a facility is normally characterized as a wetland if shallow zones (<0.5 m deep) make up more than 70 % of its volume. Unlike SWM ponds and constructed wetlands, [[Dry ponds|dry ponds]] are designed to temporarily store stormwater runoff and completely drain out between storm events and focus more on flood attenuation than treatment.

*Sub surface flow systems provide generally lower health and safety risks and are sometimes employed to handle stormwater in combination with another wastewater stream. In horizontal sub-surface flow wetlands, water flows horizontally through a media bed, while in vertical sub-surface flow wetlands, water is introduced at the surface and percolates vertically through the media.

*Sub surface flow systems provide generally lower health and safety risks and are sometimes employed to handle stormwater in combination with another wastewater stream. In horizontal sub-surface flow wetlands, water flows horizontally through a media bed, while in vertical sub-surface flow wetlands, water is introduced at the surface and percolates vertically through the media.

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|+ Types of Constructed Wetland<ref>Grant, N., M. Moodie, and C. Weedon. 2000. Sewage Treatment Solutions. p. 35–67. In Sewage Solutions: Answering the Call of Nature. Centre for Alternative Technology Publications.</ref><ref name="EPA">United States Environmental Protection Agency. 1995. A handbook of constructed wetlands: A guide to creating wetlands for agricultural wastewater, domestic wastewater, coal mine drainage and stormwater.</ref><ref name="JW">Jacques Whitford Consultants, 2008. Constructed and engineered wetlands. p. 1-21</ref>

|+ Types of Constructed Wetland<ref name ="Grant">Grant, N., M. Moodie, and C. Weedon. 2000. Sewage Treatment Solutions. p. 35–67. In Sewage Solutions: Answering the Call of Nature. Centre for Alternative Technology Publications.</ref><ref name="EPA">United States Environmental Protection Agency. 1995. A handbook of constructed wetlands: A guide to creating wetlands for agricultural wastewater, domestic wastewater, coal mine drainage and stormwater.</ref><ref name="JW">Jacques Whitford Consultants, 2008. Constructed and engineered wetlands. p. 1-21</ref>

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!Free-water surface flow

!Free-water surface flow