Working With Nature Can Protect Us From Floods

David SuzukiNews of the devastating floods in Alberta hit Canadians hard. We’ve all been moved by extraordinary stories of first responders and neighbours selflessly stepping in to help at a time of great need.

As people begin to pick up their lives, and talk turns to what Calgary and other communities can do about disasters such as this, safeguarding our irreplaceable, most precious flood-protection assets should be given top priority.

The severe floods in Alberta used to be referred to as “once in a generation” or “once in a century”. As recent floods in Europe and India are added to the list, that’s scaled up to “once in a decade”. Scientists and insurance executives alike predict extreme weather events will increase in intensity and frequency. Climate change is already having a dramatic impact on our planet. Communities around the world, like those in Alberta, are rallying to prepare.

While calls are mounting for the need to rebuild and strengthen infrastructure such as dikes, storm-water management systems and stream-channel diversion projects, we’ve overlooked one of our best climate change–fighting tools: nature. By protecting nature, we protect ourselves, our communities and our families.

The business case for maintaining and restoring nature’s ecosystems is stronger than ever. Wetlands, forests, flood plains and other natural systems absorb and store water and reduce the risk of floods and storms, usually more efficiently and cost-effectively than built infrastructure. Wetlands help control floods by storing large amounts of water during heavy rains — something paved city surfaces just don’t do.

A study of the Upper Mississippi and Missouri Basins showed wetland restoration would have provided enough flood water storage to accommodate excess river flows associated with flooding in the U.S. Midwest in 1993. Research done for the City of Calgary more than 30 years ago made similar suggestions about the value of protecting flood plains from overdevelopment. When wetlands are destroyed, the probability of a heavy rainfall causing flooding increases significantly. Yet we’re losing wetlands around the world at a rate estimated at between one and three per cent a year.

By failing to work with nature when we’re building our cities, we’ve disrupted hydrological cycles and the valuable services they provide. The readily available benefits of intact ecosystems must be replaced by man-made infrastructure that can fail and is costly to build, maintain and replace.

Protecting and restoring rich forests, flood plains and wetlands near our urban areas is critical to reduce carbon emissions and protect against the effects of climate change. Nature effectively sequesters and stores carbon, helping to reduce greenhouse gas emissions. It also regulates water. Forested basins, for example, have greater capacity to absorb water than clear-cut areas where higher peak stream flows, flooding, erosion and landslides are common.

How can we protect ecosystems rather than seeing conservation as an impediment to economic growth? The answer is to recognize their real value. The David Suzuki Foundation has evaluated some of Canada’s natural assets. This approach calculates the economic contribution of natural services, such as flood protection and climate regulation, and adds that to our balance sheets. Because traditional economic calculations ignore these benefits and services, decisions often lead to the destruction of the very ecosystems upon which we rely. Unfortunately, we often appreciate the value of an ecosystem only when it’s not there to do its job.

Cities around North America are discovering that maintaining ecosystems can save money, protect the environment and create healthier communities. A study of the Bowker Creek watershed on southern Vancouver Island showed that by incorporating rain gardens, green roofs and other green infrastructure, peak flows projected for 2080 from increased precipitation due to climate change could be reduced by 95 per cent. Opting to protect and restore watersheds in the 1990s rather than building costly filtration systems has saved New York City billions of dollars.

Intact ecosystems are vital in facing the climate change challenges ahead. They also give us health and quality-of-life benefits. Responsible decision-making needs to consider incentives for protecting and restoring nature, and disincentives for degrading it.

As Alberta rebuilds and people begin to heal from the flood’s devastation, it’s time to have a discussion about adding natural capital to the equation.

With contributions from Theresa Beer. Learn more at the David Suzuki Foundation.

Author: David Suzuki

David Suzuki, Co-Founder of the David Suzuki Foundation, is an award-winning scientist, environmentalist and broadcaster. He is renowned for his radio and television programs that explain the complexities of the natural sciences in a compelling, easily understood way. You can read more about David at www.davidsuzuki.org.

One thought on “Working With Nature Can Protect Us From Floods”

  1. So, hey, there’s a running rumor, and some people in the Fort McMurray area have been telling me, that the tailing ponds near Fort McMurray overflowed or were washed into by the river at one point during the flood. Media have either not mentioned it at all, or in one case got a comment from the company saying it didn’t happen. But I look at the Google Earth picture from before the flood and with the extremely close proximity between the river and one of the larger tailing ponds, I’d be surprised if it didn’t. But there are other satellite pictures available, ones from during the flood, available for a fee affordable by media outlets and organizations that have access to people like David Suzuki, but not by tree-huggers like me, right? Please? Seriously, if it’s true people need to know but the rumor is going around and if it’s not true people need to know that too. If not Prairie Dog/Planet S could you push other media you know to maybe look into how much it would cost to get satellite pictures of the area around the tailing ponds and nearby rivers from during the flood to determine if tailing ponds and freshwater bodies made contact during that time?

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