Exeter Flood Defence Scheme CECA South West Members Presentation - PowerPoint PPT Presentation

Exeter Flood Defence Scheme CECA South West Member’s Presentation 30th November 2016 Tristan Bassett – Commercial Services Manager, EA Don Higgs – Framework Manager, BMM JV

Update – Covering .. Why we’re Building What we’re Building How we’re Building plus construction Challenges

Why We’re Building Areas at risk of Flooding – 1:100 Year Event Exwick Properties at Risk City Centre Approx. 2300 Domestic Properties Approx. 1000 Commercial Properties St Thomas Critical Infrastructure Marsh Current Standard : Generally 1 in 40 Barton Blocker to Economic Growth

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

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

Phase 1 Modification of Trew’s Flood Relief Channel New fish passes on Reduce crest of Trews Weir and side weir side weir Deepen flood relief channel and create wetland habitat Remove existing check weir

Cowley Bridge – defence Phase 2 solutions to be designed in association with Network Rail Design Aim = to maximise flow Railway – defence capacity walls and banks Channel capacity improvements Structural alterations 7.4km raised defences Station Road – flood gates St Davids Station – defence walls Exwick – defence walls and banks Bonhay Road - Localised defences. Eagle Cottages – defence walls Exe Bridges – defence embankments Haven Banks – defence embankments and walls

The Quay – Demountable Phase 2 defences Countess Wear Sewage Treatment Works – Will raise standard of flood Trews Side Weir – SWW defence crest modifications embankments protection from 1/40 annual risk to 1/100 annual risk Construction in 2 phases: Trews Flood Relief ‘In Channel’ works 1. Channel – regrading to 2. Flood defences improve capacity Mill Lane – Defence wall and Canal Banks – embankments raised embankments and walls (also acts to protect trunk sewer)

Phase 2 - The Quay Before

Phase 2 - The Quay After

Phase 2 – ‘The Quay’ During

Phase 2 – Flood Gates

Phase 2 – Cowley to St Davids Interface with Network Rail infrastructure Access

Costs, Funding and Partner Co- operation 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

How we’re Building plus construction Challenges Key Quantities Earthworks Strategy Key locations and challenges

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

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 of summer months where possible given other constraints. • Minimise haul distances and vehicular movements.

Station Road

Bonhay Road

Eagle Cottages

The Quay

Double Locks

Countess Wear

Communications Importance recognised for public, businesses and partner organisations Dedicated PL staff member Several evening drop in sessions Extensive use of social media

Zone 1 – Cowley Bridge

Zone 1 – Cowley Bridge

Zone 2 – Exwick / Flowerpot

Zone 2 – Exwick / Flowerpot

Zone 2 – Exwick / Flowerpot

Zone 3 – Trew’s Flood Relief Channel

Zone 3 – Trew’s Flood Relief Channel

Zone 3 – Trew’s Flood Relief Channel

Zone 6 – Countess Weir

Zone 6 – Countess Weir

Zone 6 – Countess Weir

Thank you!