sustainable strategic drainage studiesftp2.ciwem.org/2012/2012 20_ scottish symposium...
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Sustainable Strategic Drainage Studies
Dr Doug Lewis
Technical Manager
Grontmij Water Engineering
What are I going to say?Introduce a couple of fascinating projects that demonstrates the potential of stakeholdersworking together to deliver integrated sustainable solutions to complex urban situations:
1) Tyneside Strategic Sewerage Studies for NWL
2) South Dalmarnock, Glasgow, Strategic Studies for Clyde Gateway & GCC
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Future Impacts on Sewer Systems in England and Wales2
• Modelling review of 10 yr RP to determine the impact of climate change,population and creep in impermeable areas up to 2040, Ofwat July 2011
• 100 drainage catchments used from the ten water companies
• Unconstrained growth – in which new development is allowed to discharge inaccordance with current legislation (PPS25)
• Predicts significant increase insewer flooding using existing network
• Recommends ‘sustainable’ modifications to the catchment to reduce need tomodify the network, and a need for strategic studies to deliver these changes intime to prevent an increase in flooding
Median increase % 50th percentile
Population growth 5Property creep 12Climate change 27Combined 51
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Tyneside Strategic Sewerage Studies3
• Six pilot studies into sustainable sewerage solutions using constrained growth
• Grontmij are investigating Gateshead, North Shields and Hebburn DA’s
• Used by the partners to inform future planning by promoting the ‘bestopportunities’ for customers and the environment
• Three stage approach aligned with the principles of SWMP:
Stage 1 - Collection, collation and analysis of detailed information to identifypotential flooding locations ,dependencies and interactions;
Stage 2 - Focus on the application of a risk based approach to identify andassess sustainable drainage options; and
Stage 3 - Investment planning.
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Model Build and Future Scenarios Models4
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Hebburn Drainage Area Overview5
River Don
MonktonBurn
Bede’s BurnCulvert
Interceptor Sewer
Drainage AreaExtents
A19
A165
TyneTunnel
Pelaw
MonktonVillage
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Planned Development6
Lukes Lane2020: 378
Bedwell Ind Est2020: 353
Sth TynesideCollege2020: 100
H Mullins Earby2050: 55
HebburnCivic Centre2020: 79
Blackett St2012 : 172050: 88
HawthorneLeslie2050: 67
RiversideVillage2012: 2072020: 115
South Dr /Victoria Rd W2050: 305
School St2012: 131
Hedgely Ct2012: 2212020: 1102050: 7
Key201220202050
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Stage 1 Issues & Flooding7
Key
Lukes LaneEstate
Campbell Pk
College Rd /Finchale Rd
Walsh AveStage 1 IssuesEA 30 Yr FloodNWL Reported
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Model Predicted Flooding – 2012 v 2050 Situation8
Key275%
68%
140%
40%
10%
17%
20%
15%
15%15% 2012 FloodLocations
2050 FloodIncrease2050 New FloodLocations
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Opportunities Overview9
Opportunity Area 1: Lukes Lane
Opportunity Area 2: Bede’s Burn
Opportunity Area 3: Walsh Avenue
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Opportunity Area 1: Lukes Lane
Source Control
Ditch & Field DrainConverted to Swale
Detention Ponds
Re-profileMonkton Burn
Existing SW Sewer
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Opportunity Area 1: Lukes Lane11
1.
1. 2.
2.
Ditch & Field DrainConverted to Swale
Detention Ponds
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Opportunity Area 1: Lukes Lane12
3.
Re-profileMonkton Burn
3.
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4.
4.
4.Source Control and/or Runoff Reduction
4.
Opportunity Area 1: Lukes Lane
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Tyneside SSS results and recommendations14
Stage 1 Sage 3
• At 2050 design horizon, 40% reduction in total spill occurrence and spill volume, for 5yr RP
• 5% reduction in peak flows in the sewer system providing improved capacity
• 12% reduction in number of properties in the worst and medium risk bands for floodrisk
• Provision of landscaped water features – amenity and biodiversity benefits;
• Evidence base for future investments for all partners
• Requirements for storage conveyed into proposed development plans
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South Dalmarnock, Glasgow,Strategic Integrated Urban Infrastructure
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Stage 1 Sage 3
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South Dalmarnock, Context16
Stage 1 Sage 3
•River Clyde, Celtic Park, Games Village, NISA,
Cunningar Loop, Glasgow Green
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South Dalmarnock, Stakeholders & policy/guidelines17
Stage 1 Sage 3
In addition to Clyde Gateway and land owners, the statutorystakeholders are:
•Scottish Government (SPP, FRM & SUDSfRoads)
•SEPA (SPP7 & CAR)
•Glasgow City Council (Env3 Flood Prevention and LandDrainage, RCFM)
•Scottish Water (Sewers for Scotland 2nd Edition)
•Metropolitan Glasgow Strategic Drainage Plan
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South Dalmarnock, Flooding18
Stage 1 Sage 3
•200 yr plusclimate changeevent affectsClyde GatewayandCommonwealthGames Villagesites
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South Dalmarnock, Flooding multiple developmentimplications
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Stage 1 Sage 3
•Land raisingof both sitesincreases floodrisk from RiverClyde
•Floodalleviationschemerequired forboth sites
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South Dalmarnock, 2D Infoworks surface water flows20
Stage 1 Sage 3
•M200-120critical stormevent
•Springfield roadand Dalmarnockcross inundated
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South Dalmarnock, Natural flows & extensive catchment21
Stage 1 Sage 3
•Natural flow sub-catchments dictateSUDS locations
•Commonwealth villagesite hydrologicallyseparate
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South Dalmarnock, East End Regeneration Road22
Stage 1 Sage 3
•Issues with new road levels and railway crossing
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South Dalmarnock, Utilities & railways23
Stage 1 Sage 3
•Deep sewersto WwTW
•Dalmarnockroad andrailwayconstraints
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South Dalmarnock, Aspirations24
Stage 1 Sage 3
• Create an infrastructure framework for the regeneration of the area
• Separate surface water from combined sewers and free up WwTW capacityfor development
• Establish Operational Frameworks and agreements between maininfrastructure Stakeholders
• Establish Design Codes for Developers
• Encourage and improve Cycle Path /Pedestrian links
• Encourage view corridors to the river, safe play and recreation areas
• Create multi-functional urban corridors
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South Dalmarnock, Integrated urban infrastructure25
Stage 1 Sage 3
•Integrating bluespace (SUDS)green space(amenity) andmovement(brown)
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South Dalmarnock, SUDS elements26
Stage 1 Sage 3
•Development blocksource controlsleading to local orregional structures
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South Dalmarnock, SUDS elements27
Stage 1 Sage 3•Flood Strategy1 in 200 yearevent
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South Dalmarnock, SUDS elements28
Stage 1 Sage 3•Flood Strategy1 in 200 yearevent plusclimate change
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South Dalmarnock, SUDS Model29
Stage 1 Sage 3
•InfoworksCS/2D model
•Strategicoptioneeringtool
•1%reduction inpass forwardflows
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South Dalmarnock, Pond elements30
Stage 1 Sage 3• Regionalstructure not SfSstandards asspace limited
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South Dalmarnock, Park elements31
Stage 1 Sage 3
•Riverside &railway parks
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South Dalmarnock, Masterplan32
Stage 1 Sage 3
•RIBA Stage Boutline design
•Infrastructure ledMasterplan
•Winner of 2011Scottish designawards forMasterplaning
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South Dalmarnock, Revised SUDS route33
Stage 1 Sage 3
• Carrier drain following Dalmarnock Road until Springfield Road
• RIBA C detailed design for Riverside Regional SUDS and localSUDS
• Reduced from four to three development fingers
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South Dalmarnock, Revised SUDS model34
Stage 1 Sage 3
•Potentialretrofitareas
•Threedevelopmentblockfingers
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South Dalmarnock, Revised SUDS detail35
Stage 1 Sage 3
•TraditionalWindesmodelling
•Source,local andregionalcontrols
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South Dalmarnock, Success factors36
Stage 1 Sage 3
•Determined and integrated design team
•Stakeholders will to succeed
•Worthwhile objectives - increased environmentalquality and amenities
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South Dalmarnock, Results37
Stage 1 Sage 3
•Integrated Masterplan basedon IUI
•Developer interest
•Statutory approval ongoing
•Exemplar design
•Riverside area and carrier draincurrently being progressed
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South Dalmarnock, SWMP/Masterplan/IUI38
Stage 1 Sage 3• Thank you