case study - sustainable drainage design and adoption guide with examples of schemes - simon bunn,...

Cambridge City Council

The Cambridge Approach to

SuDS

Simon Bunn – Sustainable

Drainage Engineer

Drivers:

Growth

Existing

Infrastructure

Elected

Members

Sustainability

1 NIAB – 1593 homes

2 University – 3000 homes

+ 2000 bed student

accommodation

3 Trumpington Meadows –

1200 homes

4 Glebe Farm – 286

homes

5 Addenbrooks 20:20 –

medical research campus

creating 9000 jobs

6 Clay Farm – 2300 –

homes

7 Bell School – 347 homes

+ 100 bed student

accommodation

8 CB1 – 331 homes + 1250

bed student

accommodation

9 North East Cambridge

East Cambridge?

Orchard Park – 1120

What is in the Guide?

Landscape and urban design focused

Cambridge specific and multi disciplinary

What we will adopt and the process

Principles of adoption

Typical section – Ponds and wetlands

On site verification

Maintenance costs

Adoption checklist

Cambridge Design and Adoption Guide –

conclusions:

•Developers appreciate good guidance,

with clear requirements

•Good up front design promoted

•Landscape focused

•Multi-disciplinary teams encouraged

SuDS Exemplars:

What can be achieved

Cambourne, Cambridgeshire

• New residential development of 35 dwellings

• Two-year monitoring project – Interim results:

– In comparison to the control site the SUDS site shows significant

attenuation in flows and volumes following rainfall events

– The SUDS features act to delay discharge of water from the site

– The SUDS treatment train is acting to improve water quality; this is

illustrated through reductions in concentrations of a variety of

pollutants and other indicators.

– There are significantly higher concentrations of hydrocarbons at the

control site compared to the SUDS site.

– The SUDS features offer environmental benefits through a diverse

range of habitats.

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