What can we learn from the River Axe – an award winning project
Sun Yan Evans – Mott MacDonald Andy Emblin – Environment Agency Outline
1. Introduction 2. River Axe catchment 3. History of flooding 4. Project set up & funding 5. Project governance 6. Tiered approach & efficiency 7. Key ingredients for success Introduction R. Yarty River Axe catchment
R. Axe
96km2 178km2 Key features
R. Yarty
R. Axe
Axminster History of flooding – Chard Junction
31/12/2000 19/12/1992
29/11/1965 07/07/2012 History of flooding – Broom
13/10/1993 13/10/1993
7/12/2000 30/11/2012 Key recent event: 7th July 2012 storm 7th July 2012 event
Chard Junction
Broom
Weycroft
Axminster
Whitford Damages from 7th July 2012 event All three parties affected
EA
Network Rail
DCC Response from organisations affected
• EA – A more evidence-based understanding of present day flood risk
• Network Rail – To enable better management of future flood risk, develop asset resilience
• Devon County Council – To assist future planning of flood risk management Project set up & funding
Common interests: to improve understanding of flood risk, to tackle challenges and issues for greater & wider benefits
Project set up Partnership Collaborative funding working Project governance
Senior Users Senior Supplier Advisory Group (Legal, procurement) Project Board
Project Product Director Owners
Stakeholder Working Group Project Team (Chair: EA PM) Joint development of project scope
We understand each other’s needs & requirements, impacts and benefits Tiered approach to bring further efficiency Flood risk assessment - approach • 2D model Ü • Multiple events • Multiple scenarios • Flood progression • Depth, velocity, hazard
2013 Channel Survey • Wider use Extent of 2D domain 1m LiDAR Elevation (mAOD) 250m
– WFD 10m
SAR Elevation (mAOD) – Option testing 170m
0m
0 0.75 1.5 3 Kilometers Asset Vulnerability: Key sections at risk of flooding Railway Road Chard Junction Station Road, Chard Junction
Broom Crossing Broom Lane Axe Farm
Weycroft Weycroft Bridge
Millbrook Stream White Bridge
Shand Park B3261 Bow Bridge
Whitford
Whitford Road Volumes > 25,000m3 stored behind railway Key achievements for Tier 1
• Better Understanding of: – Flood Risk – Critical risk locations – Magnitude of vulnerability – Present day hazard • Built the evidence for further actions • Develop a model for wider use in the future What happened after Tiers 1, 2 & 3?
• Develop scoping plan for next phase • Option development & testing • Narrow down options • Consultations • Preferred options selected • Schemes under implementation
EA Project Excellence Award 2016 Summary - key ingredients for success
Leadership Vision Partnership
Commitment
Knowledge
Thank You