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How nature-based solutions can promote effective flood management
Flooding is a challenge affecting everything from economic security, to drinking water and the pursuit of truth and reconciliation. Canada must adapt to the urgent risks posed by worsening floods. Luckily, numerous pathways exist for individual Canadians to engage in collective actions to protect ourselves and our communities.
I learned the realities of flooding the hard way: by getting my socks wet when I stepped foot on my basement floor. Water from a pipe seeped behind the walls and under the waterproof floor. It caused damage that was, for a variety of reasons not covered by home insurance. However, I turned out lucky, all things considered. The average cost of a flooded basement in Canada is over $40,000.
Climate change is shifting how water moves through landscapes both in our communities and around the globe. Information and awareness is key in this world of changing conditions. However, a 2022 audit of flood risk preparedness in Ontario reported that public awareness of personal flood risk and liability is poor across the province.
There is a widening gap in Ontario between spending on infrastructure by all levels of government, and the scale of investments required to bring public assets like roads and buildings up to a state of good repair. Amid budget crunches and pressure to keep taxes low, solutions for adapting infrastructure to climate change are still chronically underfunded.
Nature-based community driven solutions have huge potential to address gaps in infrastructure, promote resilience and build ecological knowledge—often at a much reduced cost than traditional hard solutions like seawalls or embankments.
Much of Canada's stormwater infrastructure was built back when urban centers were smaller and sewers had fewer connections. These older systems have limited capacity to cope with large surges.
When water levels suddenly rise, operators are left with no option but to release overflows into waterways. While necessary in the short term, these actions can have huge ecological impacts.
Where I live in London, Ont., wastewater treatment plants are connected to outdated sewers that combine water from storm drains with plumbing. During heavy storms, stormwater polluted with sewage wastewater overflows into the Thames River.
Nature-based solutions—or green infrastructure—are an effective proactive technique which can be implemented close to home. Techniques to mitigate floods include using vegetation to reduce runoff by soaking rain into the ground instead of it flowing into sewers or basements.
For example, in 2022 I installed a—fully permitted—rain garden whose deep-rooted native plants receive and absorb rainwater that may have otherwise made its way into my basement.
Green infrastructure can also be highly effective along watercourses where, once established, vegetation helps to filter surface pollutants, stabilize erosion and prevent surges of water from spilling over.
We held planting workshops in partnerships with the university, the conservation authority and community members from Chippewas of the Thames and Oneida First Nations. London's municipal government and public library further helped to tell our story.
Supporting resiliency
In a new study, my co-authors and I describe how the process of implementing nature-based solutions can build cross-cultural ecological knowledge and create opportunities for participants to take direct action on climate change. Critically, community involvement in creating green infrastructure helped ensure sustained interest in its stewardship.
This project demonstrates how partnerships can enhance environmental and social benefits of climate change adaptation projects.
We encourage higher education institutions and municipalities to support resiliency by engaging the public in applying nature-based solutions like naturalized buffers along watercourses, and to include Indigenous perspectives in management of land and water resources.
It is time we stop viewing nature as a threat to be held at bay and allow our environments to be an ally in the work to build a more resilient future.
Citation:
How nature-based solutions can promote effective flood management (2024, July 19)
retrieved 19 July 2024
from https://phys.org/news/2024-07-nature-based-solutions-effective.html
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