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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 1
Ensuring policies and
strategies deliver
Simon BunnSustainable Drainage Engineer
Cambridge City Council
Application timeline - 1
Pre-preapp stage
� Early discussion detailing expectations,
constraints, opportunities with local
authority and other partners
� Local planning authority input from engineers,
landscape architects, urban designers,
ecologists and planners. (LPA technical team)
� Opportunity to influence scheme = high
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 2
Application timeline - 2
Pre-app stage - outline
� Discuss proposals:
� Multiple pre-apps discussing:
� Flow and volumetric run-off, controls, potable
water strategy, landscape, adoption strategy, flood
risk reduction scheme and future reserved matters.
� Opportunity to influence scheme = high
Application timeline - 3
Application stage - outline
� Assess submitted information:
� Provide comments and information re-
submitted
� Check re-submission
� Agree conditions
� Opportunity to influence scheme =
medium
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 3
Application timeline - 4
Pre-app stage – reserved matters
� Early discussion detailing expectations,
and opportunities with local authority and
other partners. Discussions around detail.
� Local planning authority input from engineers,
landscape architects, urban designers,
ecologists and planners. (LPA technical team)
� Opportunity to influence scheme =
medium
Application timeline - 5
Ghost application stage – reserved matters
� Assessed as if an actual application.
� Checked against policy and best practice,
interrogation of calculations etc.
� Discuss application with colleagues
� Opportunity to influence scheme = low
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 4
Application timeline - 6
Application stage – reserved matters
� Check submitted application has
addressed comments from ghost
application and provide feedback
� Fine grain details agreed through
conditions
� Opportunity to influence scheme = low
Application timeline - 7
Post applications stage – onsite monitoring
� Visit site to check what is being
constructed and how it is constructed in
accordance with submitted information.
� Opportunity to influence scheme = non-
existent!
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 5
Residential Lot M2 M2
� 240 Dwellings
� 64 dwellings per hectare
� 4 discharge locations into strategic system
at 5 l/s each
� All images copyright University of Cambridge, Hill Residential,
Alison Brooks Architects, Pollard Thomas Edwards, Robert Myers
Associates and WSP Group
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 6
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 7
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 8
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 9
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 10
Lot 2 Residential and
commercial
� 264 dwellings (key worker)
� 1983 sqm commercial use
� 8.81 l/s discharge into strategic network
� All images copyright University of Cambridge, Aecom, Stanton
Williams and Townshend Landscape Architects
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 11
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 12
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 13
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 14
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Susdrain – Achieving multiple benefits
from SuDs through planning
16/02/2016
Simon Bunn – Cambridge City Council 15
Conclusion
� Early consideration = better SuDS
� Maximise pre-app
� Attention to detail
� Don’t worry about the calcs
� Follow through to construction