Introduction to sustainable drainage.
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1 Introduction to sustainable drainage
2 Outline of presentation Challenges of existing drainage Drivers for SuDS SuDS philosophy and principles Benefits of SuDS Examples of SuDS Challenges of SuDS Summary
3 Challenges of existing drainage Flooding Too much runoff from developments into watercourses Runoff drains too quickly into watercourses Environmental Runoff is polluted Does not enhance biodiversity or green space
4 Natural catchment (greenfield) evapotranspiration surface flow baseflow interflow
5 Developed catchment evapotranspiration surface flow interflow baseflow
6 Drivers for SuDS Flood and Water Management Act Climate Change Water Framework Directive Planning policy statements Building Regulations & The Code for Sustainable Homes Local Authority plans Flooding in Sheffield 2007 Environment Agency
7 The SuDS philosophy Mimic natural drainage from a site Where possible, manage water on the surface Manage runoff close to source Provide multiple benefits SuDS scheme at Stamford Robert Bray Associates
8 SuDS principles The management train SuDS components in series Source control runoff managed as close as possible to where it falls as rain Sub-catchments division into small areas with different drainage characteristics and land use SuDS scheme in Sheffield CIRIA
9 SuDS schemes SuDS can include a variety of components. The selection of SuDS components depends on site opportunities and constraints. Provide management and treatment train. Shallow systems are always better than deep systems (and usually cheaper) Shallow systems are safer (construction and operation) Retrofit SuDS in Islington CIRIA
10 SuDS and multiple benefits Reduced flood risk Improved water quality Increased biodiversity Increased levels of green infrastructure Better places to live Engagement with local communities Adaptation to climate change Carbon management Quantity The SuDS triangle Quality Amenity/ biodiversity
11 SuDS can be this Swale in a school, Exeter Robert Bray Associates Linear wetland, Scotland CIRIA J4 Services, M8, Scotland Wetland pond, London CIRIA
12 SuDS can be this Green roof, London Lambeth Council Permeable pavement, Stamford Robert Bray Associates Bioretention, Portland, Oregon Environmental Protection group
13 Delivering SuDS SuDS at Lamb Drove, Cambourne, Cambridge 35 dwellings per hectare Adaptation to climate change SuDS retrofitted to existing layout Attenuation to 1:100 year storm return period (plus 20% climate change) Resilience and resistance measures included Artist impression of Lamb Drove Thanks to Cambridgeshire County Council and Royal Haskoning!
14 Site control Detention basins Source control/ conveyance control/conve Swales yance Swale Source control Green roof Prevention/ Source control Water butts Source control Permeable surface Source control/ conveyance Underdrained swales Regional control Retention pond
15 Source control Cambourne Swale Green Permeable roof internal paving Swale swale - Greenway
16 Site control Cambourne Detention Detention basin basin near near play entrance Detention basin near golf course area (NE)
17 Construction and operation Construction Programme management Silt management Attention to detail essential Inspection of works Operation Assess any H&S risks Maintenance - landscape tasks Simple checklist of tasks Multiple adoption: Cambridge Housing Society site care Wildlife trust off-site care County council permeable paving
18 Lessons learnt from Lamb Drove SuDS philosophy is suitable for any development. Early planning discussions are essential. Setting/agreeing the design criteria Consider/agree adoption mechanisms SuDS design is interdisciplinary. Well designed SuDS can be cheaper than traditional drainage. Keep it simple.
19 Possible challenges Adoption and ownership who does what? What about existing problems Urban creep Retrofitting surface water management Linkages with spatial planning (surface water management plans) Delivering those multiple objectives
20 Summary Many different components available to develop SuDS for a site. SuDS are a flexible drainage concept that can be used on any site. Specific constraints may preclude the use of some but not all components.
21 Sources of information CIRIA: LANDF RM: EA: SEPA:
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