Presentation by Didrik Meijer, Deltares, The Netherlands, at the Delft3D - User Days (Day 1: Hydrodynamics), during Delft Software Days 2016. Tuesday 1 November 2016, Delft.

1. Urban Water Modelling
Didrik Meijer

2. Introduction
Irrigation and drainage
Almost no data
Local knowledge

3. Programme
Cotahuasi,
Peru
The
Netherlands
New Orleans,
USA
Colombo,
Sri Lanka
Dar es
Salaam,
Tanzania
City of Cork,
Ireland
Singapore

4. BvBeeld/Stichting RIONED
Prevent flooding
BvBeeld/Stichting RIONED

5. Critical Infrastructure: City of Cork

6. Cities
19 november 2016

7. Intensity of rainfall

8. What makes an urban model special?
High level of detail
Different systems:
Sewer system
Drainage system
Surface water
Flash floods
Fluvial, puvial, coastal flooding

9. Combining different data sources

10. Data galore: authority  crowd!

11. SRTM Data => 2D model

12. Changing cities  changing floodings
Before After

13. Adaptation Support Tool
Assist stakeholders (urban planners, drainage departments,
municipalities, landscape designers, project developers, housing
corporations, etc.)
in the process of decision making and designing climate
adaptation measures
to create resilient, attractive, flourishing cities
by providing Adaptation Support Tool and facilitating the design
process

14. Adaptation Support Tool

15. Climate Adaptation App - Pre-selection
• Aim:
• Show options to make urban environment (climate) robust
• Fluvial and coastal flooding
• Pluvial flooding
• Groundwater flooding
• Drought
• Heat
• Tool:
• Rank and (pre-)select 126 adaptation measures based on local
conditions

16. Adaptation Support Tool – Package formulation
• Aim:
• Support design of climate robust cities
• Pluvial flooding
• Drought reduction and groundwater recharge
• Water quality
• Heat stress reduction
• Tool:
• Design climate robust urban developments
19 november 2016

17. Adaptation Support Tool

18. SOBEK 2
Urban Rainfall Runoff
Urban 1DFLOW - pipes
Urban 2DFLOW - runoff
Limitations
2D Grid cells <1.000.000
Calculation time

19. Case Leeuwarden
Leeuwarden Centrum
Area (km2) 52 1.1
Grid cell (m2) 4x4 1x1
Number cells million 3,2 1,1
Rainfall event 30 mm in 1 hour 30 mm in 1 hour
Calculation time
(minutes)
60 10

20. Resultaten Leeuwarden Centrum
Invoegen filmpje Niels uit Quickplot

21. Leeuwarden - 3D interactive modelling

22. Colombo - 3D visualization

23. Singapore: flash flood forecast, water harvesting
19 november 2016

24. Future: fast way to build models
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25. Deltares and models
• Vast knowledge about models to advise about water management
• Deltares models
• Other Models
• Build models based different data sources
• Develop and share models
• Continuity in a rapidly changing world
• Robust solutions
• Easy to maintain

26. Toolbox: models
WANDA
MIKE-URBAN
Delft3D FM HEC-HMS
HBV 3Di

27. Future
Urban flooding is becoming increasingly important
Developments:
Data => models
Sewer systems => Delft3D FM
Connection Groundwater  drainage system  surface water
Fast detailed modeling of urban area with Delft3D FM

28. <Hoofdstuknummer>
<Hoofdstuktitel>
Questions?