Sustainable Urban Drainage Systems. Diederik Rousseau Tineke Hooijmans
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1 Sustainable Urban Drainage Systems Diederik Rousseau Tineke Hooijmans
2 Contents Presentation Water cycle links The issues facing stormwater management Conventional approach and drawbacks SUDS triangle and management train SUDS techniques Benefits and sustainability Examples: modelling and implementation
3 Water Cycle Percolation
4 Links within the water cycle Stormwater Water quality Potential resource Sewer capacities Water treatment standards The Urban Water Cycle Water supply Potential resource Wastewater volume Wastewater SWITCH Training Kit by: R. Philip and B. Anton ICLEI Local Government s for Sustainability
5 The issues facing urban stormwater management Increased urbanisation Inadequately designed and maintained infrastructure Changing weather patterns due to climate change Fragmented management structures SWITCH Training Kit by: R. Philip and B. Anton ICLEI Local Government s for Sustainability
6 Links between stormwater management and other areas of the water sector Water supply Water treatment Wastewater management Water quality SWITCH Training Kit by: R. Philip and B. Anton ICLEI Local Government s for Sustainability
7 Links between stormwater management and other sectors of urban management Roads and transport Housing Solid waste Parks and gardens Land-use management SWITCH Training Kit by: R. Philip and B. Anton ICLEI Local Government s for Sustainability
8 The conventional approach Combined sewers Concrete drainage culverts, channels and pipes Disposal of stormwater directly into rivers, lakes and coastal waters Charles Humphrey North Carolina Cooperative Extension
9 Drawbacks of the conventional approach to stormwater management Increased downstream flood risk Erosion and sedimentation Overflows in combined sewer systems Pollution of receiving water bodies Waste of a valuable resource Charles Humphrey North Carolina Cooperative Extension
10 A more sustainable approach:the SUDS triangle reducing the impact of urban drainage on the environment SWITCH Training Kit by: R. Philip and B. Anton ICLEI Local Government s for Sustainability
11 A more sustainable approach: the concept Storm water attenuation and retention River restoration Combining water infrastructure with landscape design Embedding water management into existing urban and regional planning Incorporating water recycling facilities into urban architecture
12 SUDS management train
13 Objectives Encourage move away from end-of-pipe techniques Optimize management trains for different developments
14 Examples of SUDS techniques/systems Source control and prevention techniques Green roofs Permeable pavements Rainwater harvesting Infiltration trenches and basins Permeable conveyance systems Filter drains Swales Passive treatment systems Detention basins Retention ponds Wetlands
15 Source control and prevention techniques: Green roofs
16 Source control and prevention techniques: Permeable pavements
17 Source control and prevention techniques: Infiltration trenches and basins
18 Source control and prevention techniques: Rainwater harvesting
19 Permeable conveyance systems: Filter drains and swales
20 Passive treatment systems: Detention basins or dry ponds Harlow et al., 2000 Inlet
21 Passive treatment systems: Retention or wet ponds Harlow et al., 2000
22 Passive treatment systems: Wetlands Harlow et al., 2000
23 Benefits of sustainable urban drainage solutions Flood control Pollution control Protection against erosion Aquifer replenishment Alternative source of water Amenity value Climate change adaptation
24 Why the non-conventional approach is more sustainable Amenity value Social sustainability Reduced flood risk Protection and enhancement of natural habitats Reduced pressure on natural water supply sources Environmental sustainability Economic sustainability Reduced treatment and pumping costs Reduced flood risk
25 Example MUSIC Model for Urban Stormwater Improvement Conceptualisation ( Conventional Drainage Scenario - Pipes designed not to flood under the critical 1 in 30 year return period event - (Rapid) discharge to combined sewer - No attenuation Retrofit SuDS in Theory and Practice Virginia Stovin (2007)
26 MUSIC Model for Urban Stormwater Improvement Conceptualisation (Retrofit) SUDS Design Scenario Implements: Green roofs Porous carparks Swales Pond Retrofit SuDS in Theory and Practice Virginia Stovin (2007)
27 MUSIC Model for Urban Stormwater Improvement Conceptualisation Hybrid Option - Conventional piped drainage with pond (simpler retrofit) Retrofit SuDS in Theory and Practice Virginia Stovin (2007)
28 MUSIC Model for Urban Stormwater Improvement Conceptualisation Retrofit SuDS in Theory and Practice Virginia Stovin (2007)
29 MUSIC Model for Urban Stormwater Improvement Conceptualisation Retrofit SuDS in Theory and Practice Virginia Stovin (2007)
30 MUSIC Model for Urban Stormwater Improvement Conceptualisation
31 MUSIC Model for Urban Stormwater Improvement Conceptualisation) Retrofit SuDS in Theory and Practice Virginia Stovin (2007)
32 Implementation example: Lamb Drove - SUDS residential scheme UK Lamb Drove is a new residential development of 35 homes, 1 hectare site (in city of Cambourne) Demonstration project
33 SUDS used management train: water butts permeable paving a green roof swales detention and wetland basins a retention pond
34 Comparison study sites The study comprises of a study site (Lamb Drove) and a control site (Friar Way) with similar characteristics in terms of a new residential development area of a similar size, but does not include the SUDS measures as described above.
35 Comparison of Discharge at the Lamb Drove SUDS site and the Control Site
36 Comparison of hydrocarbon concentrations at the SUDS site and control site
37 Key findings The SUDS features act to attenuate an 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 There appears to be some reduction in metals as water progresses through the SUDs system but the most significant result is the reduction in zinc Suspended solids are generally below expected levels There is also a benefit in relation to Phosphorus, Nitrogen, COD, BOD and Ammonia
38 Key findings SUDS features offer environmental benefits through a diverse range of habitats and this benefit will increase as the site develops There have been problems regarding implementation of the original maintenance regime. This has been resolved through a site visit with the contractor
39 Other Issues Maintenance - swales and detention basins: a monthly site visit to undertake grass cutting, litter picking and inlet/outlet inspections. The permeable paving: maintenance includes biannual suction sweeping. Stakeholder information In addition a site display board has also been erected on site Monitoring ongoing monitoring of the system in order to demonstrate the long term impact of SUDS on both the quantity and quality of water leaving the site as well as environmental and social implications
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