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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
Anthony M cCloy M cCloy Consulting Introduction Limitations of - - PowerPoint PPT Presentation
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
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The traditional approach to drainage
- Runoff is collected in
gullies and channels
- Directed through pipes
- Runoff quickly conveyed
to watercourses without treatment
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The combined system legacy
- Additional development increases
frequency, rate and volume of runoff
- Increases frequency of spill of
untreated sewage to rivers & coast
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How nature manages rainfall
Interception losses Rainfall dissipated to ground Slow rates
- f surface
runoff
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What’s changing?
- Continuing flooding and
pollution issues are forcing rethink
- More liberal attitudes to water
in the urban environment
- Others (non-engineers) are
increasingly becoming involved
- W ater / runoff potential to
become a site asset
Quantity Quality Amenity & Biodiversity
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Pitfalls to avoid
- Gully and pipe
collection
- No source control
- Single storage location
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Health and safety concerns?
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- Shallow slopes
- Requires runoff entering at or close to surface
High quality amenity creation = simplified drainage management ?
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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.......
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Design procurement
SuDS designer commissioned on time-charge ...
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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
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Construction and maintenance
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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
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Australia Road - London
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Existing site
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Creating an urban oasis
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Detailed design
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Summary
- Drainage that over performs
- Integrated into the urban fabric
- Change in design approach
- Managing runoff on surface - intriguing
- pportunity to create design features
- Communication is key
- Don’t forget the primary stakeholders...
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