www.scottwilson.com water cycle strategies an integrated approach? dr jon hillman, scott wilson paul...

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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

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Thank-you

Jonathan.Hillman@scottwilson.com