Building a business case for water sensitive urban design as a basis for adaptation CELESTE MORGAN

Transcription

1 Building a business case for water sensitive urban design as a basis for adaptation CELESTE MORGAN

2 Let s start the conversation. I can only be certain about uncertainty! Metrics please And we need to be doing something! Policy Research UK: +30% to design storms Melbourne: Use a long rainfall record Yes please. Oh and certainty Practice

3 Hmmm Just try your best. Ok? Policy Of course we always try our best Research Please give me something practical And costeffective Practice

4 Can you show me where the opportunities for change are? Yes, we can show you what we are working on Research Yes, I can provide evidence for a business case Can you help us make the case for adaptation? Policy Practice

5 We are agents of change... Opportunistic adaptation (a.k.a sneaky adaptation) Regeneration and evolution of cities provide the opportunity to instil climate change resilience in an economically effective manner Partnerships are essential

6 THE RIPPLE EFFECT Building resilience of urban water systems to climate change

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8 Water Sensitive Urban Design [waa-ter sen-si-tiv ur-buh n dih-zahyn] Verb Water Sensitive Urban Design (WSUD) is the process of integrating water cycle management with the built environment through planning and urban design.

9 Targeting five future risks Flooding Water Stress River Quality Population growth and liveability Urban Heat

10 Methodology: Working with partners to build resilience Context Business Case 1 Research 7 Build a business case 2 Test and supplement 8 Test the soundness of the business case 3 Refine areas of opportunity 9 Quantify the monetary benefits Opportunities 4 Tailor to areas of opportunity 5 Test and identify 6 Assimilate ideas identified Research Policy Practice

11 CONTEXT: COVENTRY

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13 Finding opportunities through regeneration

14 Example business case: Daylighting of the River Sherbourne in Coventry city centre Before After Total benefits: 12.8 million over 40 years or 3.8 times the 3.3 million site cost Commercial rent increase, river quality, flood risk reduction, biodiversity

15 Example business case: Coventry green sustainable drainage street retrofit Before After Total benefits: 906,000 over 40 years or 7.5 times the 121,000 site cost House value increase, healthy trees, air quality, stormwater management 3x the benefits if water reuse is included

16 Water company Environment Agency Local Authority Property Owner New water supplies Sewer Functionality Surface Water Management Flood Regeneration protection Pedestrian Links Property values Water Quality Cultural Value Ecosystem Enrichment Urban heat island Reduction Lower bills Air quality

17 Looking at Melbourne change opportunities: Preston PAA

18 Embedding flood resilience through design

19 Strategic Stormwater harvesting network Treated and harvested stormwater Storage Pressurised stormwater transfer main x x Irrigation demand Residential demand 6.5 x Commercial demand Irrigated landscapes for microclimate benefits Local water supply Water quality improvement 27% cost saving for developers Strategic partnership needed between water company and council

20 What is needed to assist action? Spatial understanding of: Climate impacts Re-development and urban change Social and economic drivers Desirable natural benefits Proof of benefit: Wider benefits of softer benefits Monetary value demonstration Link research to delivery partners: Create partnership forums around opportunities Seek designs with maximum benefit Link to delivery mechanisms

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