London Flood Risk Management Strategy Adam Hosking
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Presentation from NY/NJ Metropolitan Storm Surge Working Group Conference, May 18, 2017
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London Flood Risk Management Strategy Adam Hosking
- 1. Thames Estuary 2100 London’s Flood Risk Management Strategy Presented by Adam Hosking Practice Director Water Resources & Ecosystem Management, CH2M
- 2. 2 Overview • The UK Strategic Approach • TE2100 – The Strategy • TEAM2100 -‐ Implementation
- 3. 3 • Watershed & Coastal Cell Plans • Large scale – Physical systems & driving forces – Integrated response and planning • Long term view – Climate change – Sustainable approaches – Whole life costs UK Strategic Flood Risk Management Framework
- 4. 4 North Sea The Thames Estuary 2100 Strategy
- 5. 5 Thames Estuary 2100 Why? Provide continued protection for 1.25 million people and £200 billion worth of property from tidal flood risk on the River Thames, over the next Century.
- 6. 6 TEA-ZZ-ZZ.ZZ-TP-PM-ZZ-000005 ISSUE DATE: 07/08/2015 UNCONTROLLED WHEN PRINTED 6
- 7. 7 • Over 4000 Assets • 9 Major Barriers • 350km linear defences • 300+ active structures TE2100 – Protection System
- 9. Thames Barrier, UK • Operational since 1982 • 520 meters long • 10 gates : 4 navigable 61 meters rising sector gates, weighing 3,300 tonnes; 2 No. 31.5m wide RSG plus 4No. 31.5m falling radial gates • Gates are filled with water when submerged and empty as they emerge from the river • Cost: £534 million (£1.3 billion at 2001 prices) • Level of protection: 1 in 1,000 year
- 10. 10 Major Barriers Largest Programme Since Original Construction
- 12. 12 Climate change scenarios Increases in peak 1000-year surge tide level and sea level rise component 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 2000 2020 2040 2060 2080 2100 2120 Date Sea level (m AOD) at Southend Medium High SL rise Medium High total High ++ SL rise High ++ total Defra SL rise Defra total (= SL rise) High + SL rise High + total Latest DEFRA SL rise Increases in peak 1000-year levels at Southend under 5 different climate change scenarios TE2100 Climate Change Scenarios
- 13. 13 Freeboard: Standards of Protection
- 14. 14 • Four approaches (High Level Options) to manage water levels through the century: – Traditional Engineering (HLO 1) – Floodplain Storage (HLO 2) – New Barrier (with/without Thames Barrier) (HLO 3) – New Barrage (HLO 4) • The limits to adaptation study identified the thresholds at which each option would no longer provide an adequate standard of protection to London Estuary-‐Wide Planning for an Uncertain Future
- 15. 15 Feasibility of Raising the Existing Defenses
- 16. 16 Feasibility of New Defenses
- 17. 17 17TEA-ZZ-ZZ.ZZ-TP-PM-ZZ-000005 ISSUE DATE: 07/08/2015 UNCONTROLLED WHEN PRINTED Geomorphology – Impacts on Flood Protection
- 18. 18 Assessment of Managed Re-‐Alignment Sites
- 19. 19 1m0m 4m3m2m Max water level rise: New barrier, retain Thames Barrier, raise defences Raise Defences New barrier, raise defences New barrage HLO 1 HLO 3a HLO 3b HLO 4 HLO 2 The plan considered a combination of approaches Existing system Improve Thames Barrier and raise d/s defences Over-rotate Thames Barrier and restore interim defences Flood storage, improve Thames Barrier, raise u/s & d/s defences Flood storage, over rotate Thames Barrier, raise u/s & d/s defences Flood storage, restore interim defences TE2100 H++Defra UKCIP MH TE2100 H+
- 20. 20 Strategy Findings • With an adaptable plan rising water levels can be managed through this century and into the next • Continue to maintain/improve existing FRM structures – barriers, gates, levees • Spatial and emergency planning essential part of future FRM • New inter-tidal habitats before 2030 to offset SLR impacts • The Thames Barrier should continue to provide protection towards the end of the 21st century • Barriers and/or barrage are essential under all future scenarios to manage surges and SLR
- 21. 21 Thames Estuary Asset Management 2100 (TEAM2100) • CH2M appointed as Delivery Partner • Top 40 UK Government Major Project • At £300 million -‐ the Environment Agency’s largest single flood risk programme • Efficiency target of £100 million over 10 years
- 22. 22 TEAM2100 Work Scope – 10 year programme: • Asset Management • Asset Investigations • Appraisal • Detailed Design • Construction • Programme Management and Scheme Optimisation • Programme Controls • Partnership Funding To Deliver: • Improved Asset Management – ISO55000 • Reduced Flood Risk • Integrated Solutions • Great Efficiencies • Lessons/Best Practice for Future FCRM Delivery
- 23. 23 Estuary Wide Asset Management Approaches TEAM2100
- 24. 24 TEAM2100 AM Approaches – Asset Investigations 3D Scene from UAV Imagery
- 25. 25 • Whole Life Cost and Deterioration Modelling • Sensors creating a smart estuary TEAM2100 AM Approaches – Whole Life Approach
- 27. 27 Foreshore erosion forming cavity under wall AM Approaches – Monitoring Duke Shore Wharf -‐ Mass concrete wall undermined by foreshore erosion
- 29. 29 … and repair!
- 30. Operatives removing silt from gate Alpha leaf cell A. Operatives require ear defenders & protective clothing. Heavy silt material on floor of gate leaf removed using jet wash.
- 31. 31 Thames Barrier Principal Inspections – 3D Scanning
- 32. 32
- 33. 33 TEAM2100 Status • Achieved ISO55000 AM Accreditation • Whole life cost modelling to change estuary asset management approach -‐ £1000m WLC saving? • £50m savings identified on large realignment schemes, accelerate schemes • £33m programme in 2017 • £15m efficiency savings in 2017
- 34. Thank You Any Questions? Adam.Hosking@CH2M.com
- 35. 35
- 37. 37 Risk Management TEA-ZZ-ZZ.ZZ-TP-PM-ZZ-000005 ISSUE DATE: 07/08/2015 UNCONTROLLED WHEN PRINTED 37
- 38. 38 ~ £1.4 bn ~ £1.5 bn ~ £6 -‐ 7 bn First 25 years 2010 – 2035 Continuing investment and planning together Middle 15 years From 2035 to 2050 Renewal and reshaping the riverside To the end of the century From 2050 Moving towards the 22nd century The Strategy