Flooding in Sri Lanka. Photo by trokilinochchi via Flickr
Perhaps it was just the rain pouring down outside the conference hall windows, but issues related to floods conjured up particularly vivid images at the 5th World Water Forum today. While the planet as a whole faces an ever-more-acute water shortage, cities and regions struggling to deal with an often-seasonal excess of water can hardly be expected to feel blessed.
A slideshow presentation by Jesper G. Dannisoe of the Danish company DSI showed some of the worst-case scenarios of urban flooding in the developing world: solid waste swept into the streets from overloaded sewage and stormwater systems, elevated homes submerged up to their doors, forcing residents to walk or swim through the contaminated water that is also seeping into the tanks where they stored household water, and sometimes even into the city's main water supply itself.
According to the 2007 Intergovernmental Panel on Climate Change report, more than two-thirds of large cities -- containing millions of people -- are vulnerable to rising sea levels. Increasingly heavy storms associated with global warming can also overwhelm city infrastructure. A computer-modeling program, MIKE FLOOD, by DHI is meant to help cities better prepare for inundation by showing in detail where flood waters are likely to go, which buildings are most vulnerable to damage, and estimating the costs that will be incurred.
The effort to better mitigate the safety, health, and economic risks associated with floods has also brought coastal cities from New York to Jakarta, London to Sao Paolo, together in the Connecting Delta Cities project, part of President Bill Clinton's C40 initiative for cities to tackle climate change. Though representatives at the water forum emphasized that different delta cities need different solutions because of their varying socioeconomic situations, they hope to find benefit in exchanging information and knowledge about the problems they share -- problems that will soon affect half the world's population.
London, for example, is looking at adopting both the Dutch technique of setting aside land that occasionally floods for compatible uses, like parks and floating greenhouses, and the permeable pavement used in Seattle to better absorb stormwater runoff. Singapore, meanwhile, is working with a Dutch research institute on dike construction. After all, when the climate is changing this fast, there's really no time to start from scratch.
More Coverage Of The 5th World Water Forum
What is this 'Big Water Meeting'? Day 1 at the World Water Forum
Linking Water, Conflict, Gender, and Migration: Day 2 at the World Water Forum
Accounting for Every Drop: Day 3 at the World Water Forum
More On Flooding
Big Floods in Northern England Won't Be Freak Events by 2080
Focus on Focus Earth: Flooding in Venice
Using the 'Flash' from Lightning To Predict Deadly Floods
Lessons From The Midwest Floods
California's Flood Risks: A 'Disaster Waiting to Happen'?
Five Asian Nations To Study How To Cope With Floods
High CO2 Increases Flooding Risk Because Plants Are Less Thirsty
Litter Aggravates Flooding In Mexico City
Eco-Drainage To Fight Floods In India
Floods, Monsoons, Heat Waves, Drought: Climate Change In Asia Now
Flood Maps: View Sea Level Rise
After the Floods, the Forest: Locals Fighting Climate Change in West Yorkshire