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Exeter Flood Defence Scheme CECA South West Members Presentation - - PowerPoint PPT Presentation
Exeter Flood Defence Scheme CECA South West Members Presentation - - PowerPoint PPT Presentation
Exeter Flood Defence Scheme CECA South West Members Presentation 30th November 2016 Tristan Bassett Commercial Services Manager, EA Don Higgs Framework Manager, BMM JV Update Covering .. Why were Building What were Building
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Areas at risk of Flooding – 1:100 Year Event
Properties at Risk
- Approx. 2300 Domestic Properties
- Approx. 1000 Commercial Properties
Critical Infrastructure Current Standard : Generally 1 in 40 Blocker to Economic Growth
City Centre Marsh Barton St Thomas Exwick
Why We’re Building
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Description of the Works
- Scheme Starts at Cowley Bridge in
the North
- End at Countess Wear / Bridge Road
in the South
- Spread out over 7 km
Zone 1 – Location of Network Rail Land Zone 2 – Exwick & Flowerpot Fields Zone 3 – Central Exeter Zone 4 – Exeter Quay Zone 5 – Exeter Canal Zone 6 – Countess Wear
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Overall Programme for Exeter FDS
Phase 1 : In-channel works south of Trew’s Weir
- Permitted development
- Completed October 2015
Phase 2 : Raised defences, gates etc
- Planning Consent received July 2015
- Future Milestones:
– March 2016: Award Construction Contract – May 2016: Site works to commence – Summer 2018: Completion
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Phase 1
Modification of Trew’s Flood Relief Channel
Reduce crest of side weir Deepen flood relief channel and create wetland habitat Remove existing check weir New fish passes on Trews Weir and side weir
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Exe Bridges – defence embankments Exwick – defence walls and banks Cowley Bridge – defence solutions to be designed in association with Network Rail Railway – defence walls and banks Station Road – flood gates St Davids Station – defence walls Haven Banks – defence embankments and walls Bonhay Road - Localised defences. Eagle Cottages – defence walls
Design Aim = to maximise flow capacity Channel capacity improvements Structural alterations 7.4km raised defences
Phase 2
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Countess Wear Sewage Treatment Works – SWW defence embankments Mill Lane – Defence wall and embankments Canal Banks – raised embankments and walls (also acts to protect trunk sewer) Trews Side Weir – crest modifications Trews Flood Relief Channel – regrading to improve capacity The Quay – Demountable defences
Will raise standard of flood protection from 1/40 annual risk to 1/100 annual risk Construction in 2 phases: 1. ‘In Channel’ works 2. Flood defences
Phase 2
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Phase 2 - The Quay Before
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Phase 2 - The Quay After
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Phase 2 – ‘The Quay’ During
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Phase 2 – Flood Gates
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Interface with Network Rail infrastructure Access
Phase 2 – Cowley to St Davids
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Costs, Funding and Partner Co-
- peration
The Partners Governance & Project Team Staff & DCC departments Future Operations Cost - £32.5m Funding Contributors Exeter CC - £3m Devon CC - £3m SWW – Up to £1.5m, dialogue ongoing EA - £25m
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How we’re Building plus construction Challenges
Key Quantities Earthworks Strategy Key locations and challenges
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Key Quantities
Earthworks Total – 130,000m3 Sheet Piling Total – 1670m CFA Piling – 280no RC Walls – 1690m Flood Gates – 14no Glass Flood Panels – 130m Demountable Flood Panels – 95m
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Key Quantities
Earthwork Strategy
- Ensure
fill meets engineering requirements, advanced trial holes / testing.
- No material moved off site.
- Control of high value core fill material.
- Programming
to take advantage
- f
summer months where possible given other constraints.
- Minimise
haul distances and vehicular movements.
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Station Road
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Bonhay Road
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Eagle Cottages
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The Quay
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Double Locks
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Countess Wear
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Communications
Importance recognised for public, businesses and partner organisations Dedicated PL staff member Several evening drop in sessions Extensive use of social media
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Zone 1 – Cowley Bridge
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Zone 1 – Cowley Bridge
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Zone 2 – Exwick / Flowerpot
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Zone 2 – Exwick / Flowerpot
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Zone 2 – Exwick / Flowerpot
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Zone 3 – Trew’s Flood Relief Channel
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Zone 3 – Trew’s Flood Relief Channel
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Zone 3 – Trew’s Flood Relief Channel
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Zone 6 – Countess Weir
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Zone 6 – Countess Weir
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Zone 6 – Countess Weir
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