Strategies for adaptation of urban drainage systems to climate change by Ole Mark, DHI
Urban Stormwater Management in Developing Countries Jonathan Parkinson Ole Mark IWA Publishing 2005 www.iwapublishing.com ISBN: 1-843390-57-4
Relationships between areas of development, urban catchments and river basin Adapted from :CWP (1998) Better site design: a handbook for changing development rules in your community. Center for Watershed Protection, USA
Conceptual framework and operational structure for IWRM
Main components of integrated urban water management
Stormwater drainage - an integral component of urban environmental management
The priorities of a city ? Drinking water Sanitation / sewers Wastewater treatment & reduction of flooding Reduction of pollution in recipients Recreative values of water
Dubai
Excessive amounts of litter in a drainage channel in Dhaka Source: Urban Stormwater Management in Developing Countries, 2005 Photo: Birgitte Helwigh
Blocked inlet to the stormwater drainage system in Dhaka
Karachi, Pakistan – 19th August 2006 While waiting for the next flood in your city… Karachi, Pakistan – 19th August 2006 Power supply,telecommunication,moblie systems disrupted Rain related death toll: 26 Rain: 50-60 mm…..
While waiting for the next flood in your city…
Urban poor living on the banks of an urban river in Jakarta, Indonesia
Causes and types of urban flooding
Today, the model is a copy of the city…. Initial elevation grid Grid with streets Final grid with streets and buildings Lowering by 20 cm places where there are streets Raising by 5 m places where there are buildings prepM21 part
Modeling of flooding in cities
What is flooded ?
What does flooding cost ? Direct Damages
Traffic Planning
Flood damage reduction Land use planning Reduction of the flood extent Reduction of the interaction with the flood Control of the surface runoff and subsequently flooded areas Emergency plans and actions Flood warning and information systems
Do you believe in climate changes ? Will a 10 year rain become a 2-3 year rain ?? 30 years => 5 years ? Can/will we ”build” fast enough ?? What do we do - When we get flooded ?
This should be avoided… This was the control of a pumping station
Flooding computed for a new “climate” 10 year rain
The football field in Greve
Flooding computed for a new “climate” 10 year rain
The football field as flood strorage…
Beijing – 2004
How should we handle extreme rain fall and climate changes in the urban areas? Informed decissions!!!
How can damages be reduced ? Can you learn something from So while you are waiting for the climate changes and the next flood in your city – spend some time to think about: What will be flooded ? What will it cost ? How can damages be reduced ? Can you learn something from other places ?
Managment of climate changes Summary Analyses of urban flooding Climate & Risk/Hazard analyses Timely management (climate, planning, cost-benefit, etc) Today In the future