Anthony M cCloy M cCloy Consulting Introduction Limitations of - PowerPoint PPT Presentation

Anthony M cCloy M cCloy Consulting

Introduction • Limitations of the piped system • Natures way of managing runoff • Barriers – perceived / cultural / political • Approach to design • SuDS woven into the existing urban fabric

The traditional approach to drainage • Runoff is collected in gullies and channels • Directed through pipes • Runoff quickly conveyed to watercourses without treatment

The combined system legacy • Additional development increases frequency, rate and volume of runoff • Increases frequency of spill of untreated sewage to rivers & coast

How nature manages rainfall Interception losses Slow rates of surface runoff Rainfall dissipated to ground

What’s changing? • Continuing flooding and pollution issues are forcing Quantity Quality rethink • More liberal attitudes to water in the urban environment Amenity & • Others (non-engineers) are Biodiversity increasingly becoming involved • W ater / runoff potential to become a site asset

Pitfalls to avoid • Gully and pipe collection • No source control • Single storage location

Health and safety concerns?

High quality amenity creation = simplified drainage management ? • Shallow slopes • Requires runoff entering at or close to surface

Integrated design • Mind shift from traditional drainage design • New lexicon for the drainage engineer – – Source control, management train, subcatchments – Legibility – Connectivity – Multi-functionality – Plus many more.......

Design procurement SuDS designer commissioned on time-charge ...

Overcoming cost barrier • All developm ents have space for SuDS • High density sites - Green roofs, Permeable pavement • Use open green space • Consider integrated design from outset

Construction and maintenance

Retro-fitting SuDS Strategic • Larger long term schem es • Real need to work with others (particularly public) Opportunistic • Small schem es combined with others works (eg. street works) • Combined budgets make rollout achievable • More rigorous planning conditions for redevelopm ent of sites

Australia Road - London

Existing site

Creating an urban oasis

Detailed design

Summary • Drainage that over performs • Integrated into the urban fabric • Change in design approach • Managing runoff on surface - intriguing opportunity to create design features • Communication is key • Don’t forget the primary stakeholders...

Thank you for listening Some people feel the rain...... ............others just get wet.