Green Streets and Water

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1 Green Streets and Water Creating liveable sustainable streets through new design and adaptation An exploration of SUDS and landscape issues

2 Illman Young Landscape Design A landscape and environmental practice specialising in: Masterplanning and site design Landscape appraisals and environmental assessments Project planning through to site inspection Our ambition: To create innovative, practical and sustainable landscapes Our practice

3 SUDS Research Illman Young in partnership with the University of Gloucestershire Completed 2 year research project Research into the design of SUDS that are functional, attractive and ecological Investigation of existing schemes within the UK and abroad Development of Good Practice Guidelines and SUDS Training SUDS Pilot projects Ongoing relationship with university

4 Green Streets and Water Green Mission Statement Management of water in streets Making streets more user friendly Climate change Reduction of surface water in existing sewers Increasing sewers not sustainable Introduction

5 What is the problem? Increased development creates extensive hard surfaces Sealing of ground prevents rain water from percolating into the soil Up to 80% of total rainfall turns into runoff within developed sites Larger amounts of water travel faster over hard surfaces Localised flooding Runoff traditionally collected in pipes Directed as quickly as possible into the nearest watercourse Problems of flooding and pollution Traditional drainage

6 What is the problem? Urban runoff effects in Gloucestershire, July 2007

7 What is the problem? Known flooded properties in Gloucestershire, July 2007

8 The problem Studies undertaken by Welsh Water compared increases of impermeable surfaces within typical housing developments in Cardiff: 20% increase in impermeable surfaces from through building of extensions, paving over front gardens, etc. 35% increase predicted by 1934 if urban creep continues as at present. Increase in impermeable surfaces

9 The problem Studies showed that if we continue as at present runoff (and potential flooding) will increase by approximately 32% by If flows from future development are controlled, flows will increase by approximately 28% by Therefore we must reduce both existing and future development runoff to just maintain present. Increase in impermeable surfaces

10 SUDS Legislation Surface run-off increasingly causes flooding 80,000 homes or more are currently at risk 270+ million of insured damage each year June 2007 floods 2/3 properties flooded by drainage systems Traditional systems have limited capacity Sewer surcharging and pollution incidents Promote SUDS as an alternative Surface Water Management Plans Consultation to resolve ownership/adoption Defra : Future Water

11 SUDS Legislation Acknowledges that SUDS are essential for reducing future flood risk Runoff should be managed in sustainable manner to mimic flows prior to development Design for events exceeding design capacity RPBs and LPAs should promote SUDS Incorporate SUDS into RSS and LDF Promote SUDS to achieve wider benefits such as water quality, biodiversity and amenity Planning Policy Statement (PPS25)

12 SUDS Legislation Modernise and consolidate existing legislation Reflect recommendations from Pitt Review and Future Water Likely measures include: LPAs to take responsibility for local flood risk management LPAs to adopt SUDS on highways and in public realm Removal of automatic right to connect New pricing policy by water companies Proposed Floods and Water Bill 2009

13 Surface Water Management Plans Guidance on implementing SWMPs for LPAs. Based on Pilot Studies and recommendations from the Pitt Review and Future Water. Importance of SUDS to manage increases in flood risk. SUDS to provide water quality and amenity benefits. SWMPs provide a framework and set of standards. Image: Defra Catchment Planning

14 How does it work in nature? Hydrological Cycle

15 How do SUDS work? Inspiration from nature

16 What makes them different? Conventional drainage systems Quantity Sustainable drainage systems Quantity Amenity/ Biodiversity Quality Amenity/ Biodiversity Quality SUDS Triangle

17 The Management Train Evapotranspiration Conveyance Source Control Site Control Regional Control Infiltration or recharge Drainage techniques used in series

18 Benefits of SUDS in Streets? Protect urban areas from flooding Protect watercourses from pollution Provide source control Recharge groundwater Provide green corridors Beautiful landscape features Tree Planting Traffic Calming Improvement of micro climate Photo: Welsh Water

19 Water Management based Masterplans Interdisciplinary approach SUDS integrated into landscape Buildings located appropriately Sufficient space provided

20 North East Cardiff The Site

21 North East Cardiff Original masterplan

22 North East Cardiff Catchment Plan

23 North East Cardiff Conceptual SUDS Strategy

24 North East Cardiff Typical road sections

25 North East Cardiff Plan: Barton Willmore Integrated masterplan

26 Cribbs Causeway, Bristol The site

27 Cribbs Causeway, Bristol Hydrology of catchment

28 Cribbs Causeway, Bristol Natural flow of water

29 Cribbs Causeway, Bristol Run-off from hard surfaces

30 Cribbs Causeway, Bristol SUDS Strategies

31 Cribbs Causeway, Bristol Typical Major Road

32 Cribbs Causeway, Bristol Typical Residential Street

33 Cribbs Causeway, Bristol Typical Mews

34 Cribbs Causeway, Bristol open channels swales along road/source control Detention basin with permanent pond Site control feature open canal Conveyance to regional control feature Detailed studies

35 New Street Designs Photo: wsud Large swales along main roads

36 New Designs Photo: Dreiseitl Photo: Dunnett Large swales along main roads

37 New Street Designs Photo: La Citta Vita Urban Wetlands along residential street

38 New Street Designs Channels and rills within Mews

39 New Designs Photo: Dreiseitl Open water features within Mews

40 New Designs Ditches kept within new development

41 Retrofitted Streets ZONES : The Gateway 2 : The Liveable Street 3 : The Civic Space 4 : The Neighbourhood Node 5 : The Community Garden 6 : The Health Garden 7 : The Suds System 8 : The Play Spaces 9 : The Green Network BRE Submission

42 BRE Submission 1 : Kinetic Ramp with Soakaway 2 : Planted Channel Partial Infiltration 3: Planted Swale Partial Infiltration 4 : Rain Water Planters 5: Water Cascade Suds and Ornamental Planted Water Feature 6 : Sunken Area Attenuation of Larger Flood Events 7 : Discharge Point 8 : Full Infiltration With Rocks and Planting Integrated with Play 9 : Shallow Channel with Rocks and Planting 10 : Dished Channel 11 : Permeable Paving 12 : Water Recycling System 13 : Flood Flow Routes SUDS Strategy

43 BRE Submission Planted Channel - Partial Infiltration Planted Swale Partial Infiltration Typical Sections

44 Retrofitted SUDS schemes Images: Portland Bureau of Environmental Services Green Street Project in Portland

45 Retrofitted SUDS schemes Photo: City of Vancouver Photo: Seattle Public Utilities Photo: Seattle Public Utilities Retrofitted Swales

46 Retrofitted SUDS schemes Filter drains along streets

47 Retrofitted SUDS schemes Portland Bureau of Environmental Services Nigel Dunnett Portland Bureau of Environmental Services Stormwater Planters

48 Retrofitted SUDS schemes Photo: WSUD Photo: WSUD Portland Bureau of Environmental Services Kerb Extensions

49 Retrofitted SUDS schemes Open channels and canals

50 Larger Control features Photo: Dreiseitl Detention basin with wetland

51 What are the perceived challenges? LACK OF KNOWLEDGE of the influence of the background geography of catchments of the best designed examples of the water quality impacts of the benefits of a fully sustainable approach to water management of unfamiliar methods of construction about retrofitting SUDS FEAR of health and safety issues of adoption issues of maintenance costs of long-term management INAPPROPRIATE REGULATION Building regulations By government departments

52 Opportunities Use water as a resource Allow water back into the city Create visible routes for water Deal with flooding locally Ensure clean water environment Provide habitat and Enhance biodiversity Use SUDS as a design element Create beautiful landscape features

53 Let s celebrate water Photo: Portland Bureau of Environmental Services in our streets!

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