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Strategies for adaptation of urban drainage systems to climate change

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Presentation on theme: "Strategies for adaptation of urban drainage systems to climate change"— Presentation transcript:

1 Strategies for adaptation of urban drainage systems to climate change
by Ole Mark, DHI

2 Urban Stormwater Management in Developing Countries
Jonathan Parkinson Ole Mark IWA Publishing 2005 ISBN:

3 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

4 Conceptual framework and operational structure for IWRM

5 Main components of integrated urban water management

6 Stormwater drainage - an integral component of urban environmental management

7 The priorities of a city ?
Drinking water Sanitation / sewers Wastewater treatment & reduction of flooding Reduction of pollution in recipients Recreative values of water

8 Dubai

9 Excessive amounts of litter in a drainage channel in Dhaka
Source: Urban Stormwater Management in Developing Countries, Photo: Birgitte Helwigh

10 Blocked inlet to the stormwater drainage system in Dhaka

11 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: mm…..

12 While waiting for the next flood in your city…

13 Urban poor living on the banks of an urban river in Jakarta, Indonesia

14 Causes and types of urban flooding

15 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

16

17 Modeling of flooding in cities

18 What is flooded ?

19 What does flooding cost ?
Direct Damages

20 Traffic Planning

21 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

22 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 ?

23 This should be avoided…
This was the control of a pumping station 

24 Flooding computed for a new “climate” 10 year rain

25

26 The football field in Greve

27 Flooding computed for a new “climate” 10 year rain

28 The football field as flood strorage…

29 Beijing – 2004

30 How should we handle extreme rain fall and climate changes in the urban areas?
Informed decissions!!!

31 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 ?

32 Managment of climate changes
Summary Analyses of urban flooding Climate & Risk/Hazard analyses Timely management (climate, planning, cost-benefit, etc) Today In the future

33


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