Embleton Road Rain Gardens


Regions:
Temperate
Scale:
Ecosystems:
Urban, Rivers and lakes
Goals:
Enhancing sustainable urbanization
Nbs actions:
Urban regeneration through nature-based solutions
Topics (Keywords):
Participatory planning and governance, Green infrastructure, Sustainability
Start/End date
31 December 2015 to 31 December 2016
Client

Bristol City Council Flood Management Team

Design Team

ARUP

Sustrans

Bristol City Council

Awards
Area Characterisation

The site is located in the Northern suburbs of Bristol on Embleton road, Southmead near a primary school. The river Trym rises in Southmead and flows southwest through Badock’s Wood.

Objectives

To reduce the flood risk, calm traffic and increase community involvement and awareness of sustainable urban drainage systems. To improve water quality in the River Trym.

Actions

The Bristol Surface Water Management Plan identified Southmead as an area that has surface water flooding problems and poor water quality in the river Trym.

Sustrans worked with Bristol City Council and ran a number of workshops to engage school pupils and the local community about sustainable water management, road safety and street art and urban design. These workshops included an on-street community design workshop during which the locals could work with a street model and trails using turf, so that the community could envision what the rain gardens might look like.

Bristol City Council’s Highways Teams were given the designs produced by the community which they adapted and then presented back for feedback. A total of five 10 square meter raingardens were retrofitted along Embleton road and a swale was created in existing green space near the school. The rain gardens were planted with wildflowers that would benefit pollinators in the area. Decorative thermoplastics, inspired by the children’s art, were also placed on the road to further slow traffic.

The rain gardens were designed to not only collect and filter surface water but also act as a traffic calming measure outside a primary school. This project has reduced flood risk as well as the speed of cars and subsequently increased walking and cycling. The raingardens and detention basin are maintained by Bristol City Council’s Highways Team and were designed with maintenance in mind.

Potential impacts/benefitis

Potential impacts/ benefits

Challenges addressed

Enhancing sustainable urbanisation

Restoring ecosystems and their functions

Developing climate change mitigation

Developing climate change adaptation

Water Management

· Improve water quality

· Increase quality and quantity of green and blue infrastructure

· Reduce  flood risk

Green Space management and enhancing urban biodiversity

· Increase amount of green space for residents

· Changing image of the urban environment

· Increased cultural richness and biodiversity

· Reduce run off

· Increase infiltration

Participatory planning and governance

· Increase communities sense of ownership

· Increase social interaction

· Social learning about location and importance of NBS

NBS benefits
  • Increase infiltration / Water storage
  • Reduce flood risk
  • Reduce run-off
  • Increase quality and quantity of green and blue infrastructures
  • Increased cultural richness and biodiversity
  • Changing image of the urban environment
  • Improve water quality
  • Increase amount of green open spaces for residents
  • Increase communities’ sense of ownership
  • Increase social interaction
  • Social learning about location & importance of NBS
Transferability of the Results

Can be used on most streets suffering from road runoff and flooding or in need of traffic control measures.

Lessons learned

Community engagement and design in projects can increase communities sense of ownership and young people are keen to get involved in these projects.

Rain gardens should not be planted directly under trees as leaf build up can be a maintenance issue. Openings should be as wide as possible.

An evaluation package should be created for these projects with regular monitoring to determine the impacts on water quality and flood risk.

Financing

The project cost £63,400 and was funded by Bristol Green Capital and Bristol City Council.

Organisations

Bristol City Council

Sustrans

Contacts

info@wenp.org.uk

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