www.scottwilson.com water cycle strategies an integrated approach? dr jon hillman, scott wilson paul...
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www.scottwilson.com
Water Cycle Strategies An integrated approach?
Dr Jon Hillman, Scott Wilson
Paul Hunt, Sustainable Development Delivery Team, Environment Agency
Rob Morris, Strategic Planning Engineer, Anglian Water Services Ltd
Mike Burrell, Planning Policy Team Leader, Norwich City Council
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3 million new houses will be built by 2020 (Housing Green Paper, CLG (2007)) Raw water resources, treatment & distribution Wastewater collection, treatment & discharges (waterbody
physical & chemical capacity) Extreme events – fluvial & pluvial Water environmental impacts Energy use & sustainabilty
Location & timing of building programme; location timing of water planning & infrastructure
Background
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Potential WCS benefits
a method for determining when and where sustainable water infrastructure is needed;
to ensure planning makes best use of environmental capacity and opportunities, and adapts to constraints;
a way for stakeholders to interact, preventing any unexpected obstacles to growth;
process that brings all available knowledge and information together to help make better, more integrated, risk based planning decisions
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Where do WCS fit in?
Regional Spatial Strategy
Local Development Frameworkand Planning Applications
SFRAGreen Infrastructure/Transport Strategy
WCS
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Three stages
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Delivery mechanisms – timelines
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Source: Environment Agency, (2008)
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Water Resources and Water Supply
Demands Existing Water Resources Future WR schemes Water Efficiency Costings
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Water Quality and Wastewater
Wastewater Treatment Capacity
Sewer Network Capacity River Quality Standards WFD Watercourse capacity
(flood risk)
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Is WwTW assessment detailed
enough?
e.g. phosphorus
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Yes
Yes
Are diffuse sources significant?
Are there catchment activities, or
opportunties?
Are measures feasible,
proportionate & within timeframe?
Discuss balance of catchment & STW
process approaches
Processes sustainable?
(e.g. P+GHG)? No
No
No
No
Yes
Suggested amendments…
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P: have we got the mix correct?
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River flow
Total P loads
Point
Diffuse
Contribution to water column concentration
River flow
P contribution and seasonality of point and diffuse sources
(Mainstone et al. 2000)
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Flood Risk to development and Flood Risk Management
Fluvial flooding Tidal flooding Other flooding sources
e.g. DG5 Register SUDS Climate Change
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Soakaway
Gully potCarrier pipe
Road surfaceGullyKerbFootpathDirection of overland flow
Local topography
Groups of housing
Storm/combined sewerCulverted watercourse
Open watercourse
Manhole
Gully
Road layout
PATHWAY
Overland flow from adjacent
areas
PATHWAY
Overland flow
PATHWAY
Overland flow
SOURCE
Exceeded sewer capacity
SOURCE
Exceeded culvert capacity or
blockage of culvert
RECEPTOR
Ponding in low points
RECEPTOR
Flooded properties
RECEPTOR
Road traffic & services disruption
!
!
!
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Conclusions & challenges
Timescales Integration with AMP, WRP, WFD RBMP (POMS)
Provision of data Key stakeholders need to be active from brief to completion
Scale WCS briefs need to be drafted with water specialists to
ensure a coherent, catchment orientated approach For some areas, a Regional Water Cycle approach may be
the way forward
