Presentation by Daan Rooze (Deltares, Netherlands) at the Climate Adaptation Symposium 2023, during the Delft Software Days - Edition 2023 (DSD-INT 2023). Wednesday, 29 November 2023, Delft.

1. Daan Rooze
Climate Adaptation and Urban Nature Based Solutions
29-11-2023
Climate Resilient Cities Tool
(CRC Tool)

2. Flooding (coastal, fluvial, pluvial, groundwater)
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3. Drought
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4. Heat stress
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5. Context for Adaptation
Climate change:
• Increase in temperature
• Increase rainfall intensity
• Sea level rise
• Increase in drought in many areas
Continuous population growth and urbanization:
• Land use change:
• Reduced infiltration and increased runoff and
discharge
• Increased urban heat island effect
• Increased water demand
Cities have been designed for current or past
conditions => retrofitting
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6. Water Sensitive Urban Design
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7. Retain – Store - Drain strategy
Retain and Detain and Store at the source to avoid overloading the drainage capacity downstream
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+ use
+ resist
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8. Urban Nature Based solutions – Sponge cities
Urban Nature-based solutions (NBS) refers to the sustainable management and use of nature (e.g.
Green Infrastructure) for tackling societal challenges.
• Effective in climate adaptation
• Co-benefits
• Adding function to green
In practice both soft and hard engineering solutions.
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9. NBS can have different functions and can provide
various co-benefits
Urban context:
The provision of ecosystem services in cities
depends on the quality and quantity of urban
green infrastructure. Green infrastructure
includes parks, gardens, urban allotments,
urban forests, wetlands, lakes and ponds in
cities, but also the natural areas – such as
forests, mountains and wetlands –
surrounding urban spaces.
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10. Urban NBS at Deltares
• Quantification of the (physical) effects of Urban NBS in models
− Hybrid blue-green grey smart solutions development
• NBS as part of the larger system
− Urban NBS, in combination with stormwater, coastal and river flooding
− Effect of upscaling of urban NBS
− NBS as infrastructure and as part of landscape
• Monitoring the effectiveness of urban NBS
− Water quantity and water quality
− Monitoring using citizen science and long-term follow up
• Supporting stakeholder processes
− Tools and workshops
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11. Climate adaptation – Stakeholder engagement
Minimizing:
• Flooding
• Heat stress
• Drought
Maximizing:
• Livability / urban regeneration
• Health potential
• Sustainable economic development
In existing cities climate adaptation involves many stakeholders:
urban planners, drainage departments, road department, landscape designers,
project developers, housing corporations, etc.
Co-creation as part of stakeholder engagement
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12. Climate Resilient Cities Tool (https://crctool.org/en/)
Assist stakeholders (urban planners, drainage departments, municipalities, landscape designers,
project developers, housing corporations, etc.)
in the process of decision making and
enabling a collaborative design process towards more resilient cities.
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13. CRC Tool: Workshop in Athens, 15 November 2023
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14. CRC Tool: Workshop in Athens, 15 November 2023
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15. CRC Tool: User interface
Applied
measures Map window
Key
performance
indicators
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16. CRC Tool: 60 Adaptation measures
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17. CRC Tool: In the adaptation process
Analysis:
- Hazard
- Risk
Method:
Hydraulic model,
heat stress
model, …
Exploration:
- Possible
adaptation
options with
stakeholders
Method:
CRCTool
Design:
- Detailed effect
of adaptation
measures
Method:
Hydraulic model,
heat stress
model, …
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18. Underlying parameters, conceptual model of CRC Tool

19. Urban Water Balance model
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The hydrological effects of the
adaptation measures are determined
by means of a multi-reservoir water
balance rainfall-runoff model
based on 30-years timeseries of
meteorological data
• Hydrological boundary
conditions of the water balance
model are based on local conditions
• Runoff is calculated for measures
with varying storage depths and
rainfall events with varying
intensities with known return
periods.
Applied multi-reservoir water balance rainfall-runoff model. A more
detailed description of this model in Van de Ven et al. [2016]
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20. Demo
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21. Contact
www.deltares.nl
info@deltares.nl
@deltares
@deltares
linkedin.com/company/deltares
facebook.com/deltaresNL