bath river avon options appraisal
TRANSCRIPT
Bath and North East Somerset – The place to live, work and visit
BATH RIVER AVON
OPTIONS APPRAISAL
Stakeholder Workshop
15 October 2014
B&NES Council
Environment Agency
GBV JV Ltd
Bath and North East Somerset – The place to live, work and visit
Welcome
Councillor Ben Stevens
Cabinet Member for
Sustainable Development
B&NES Council
Bath and North East Somerset – The place to live, work and visit
Introduction
1 CONTEXT Simon Martin B&NES
2 PULTENEY & TWERTON GATES Melvin Wood & Nigel Smith EA
3 OPTIONS PRESENTATION Andy Wallis GBV
4 QUESTION & ANSWER
5 OPTIONS WORKSHOP All
6 SUMMARY. ANY FURTHER QUESTIONS?
Bath and North East Somerset – The place to live, work and visit
LEGISLATION
Flood and Water Management Act 2010 (FWMA)
The Act aims to improve the way we manage flood risk and
creates the new role of the Lead Local Flood Authority (LLFA)
ENVIRONMENT
AGENCY
LLFA
•Sea
•Main Rivers
•Reservoirs
•Ground water
•Surface Water
•Ordinary
Watercourses
Lead Local Flood Authority
Bath and North East Somerset – The place to live, work and visit
Lead Local Flood Authority
LOCAL PARTNERSHIP
The FWMA enables
partnership to be formed
between the LLFA and the
other relevant authorities.
Bath and North East Somerset – The place to live, work and visit
Strategic Flood Board
B&NES (various departments)
Environment Agency
Wessex Water
Lead Local Flood Authority
Operational Working Group
B&NES Council Highway
Maintenance and Drainage
Parish Council Rep.
Resident Rep.
Business
Public
Parish Council
Cluster Groups
B&NES Departments
Incl. Council Connect
(public)
Neighbouring Local
Authorities
Bristol Water
Avon Fire and Rescue
Canal and River Trust
Full Council
Bristol Avon River Trust
River Regeneration Trust
Planning, Transport & Environment
Management Scrutiny Panel
(Flood Risk Management)
Strategic Flood Board: Interactions
Bath and North East Somerset – The place to live, work and visit
Lead Local Flood Authority Briefing
Bath and North East Somerset – The place to live, work and visit
Objectives of the B&NES-Wide SWMP
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1. To produce a B&NES area wide SWMP
2. Consultation with appropriate parties
3. Awareness of respective management
responsibilities of partners and
stakeholders
4. Provide a picture of local flood risk that
will be easily accessible by all
5. Increased understanding of where flooding
will occur to inform spatial and emergency
planning
6. Increased understanding of the causes,
probability and consequences of surface
water flooding
Pulteney and Twerton
Name: Melvin Wood & Nigel Smith
Job title: Flood Risk Management
Date: 15th October 2014
Why are we involved?
We protect and improve the environment for people and the wildlife
Exercise a supervisory duty on all matters relating to flood defence
Implement coastal improvements and flood defence schemes
Permissive powers to regulate activities on ‘Main River’
Opportunity to work in partnership with B&NES and developers to secure long term solutions for Twerton and Pulteney.
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Pulteney Radial Gate The radial gate is part of the Bath FAS built in the 1970’s.
This asset is approaching the end of its design life
Impounds water at low flows in conjunction with Pulteney weir
In flood conditions it automatically opens as the head of water increases.
In a large flood event the radial gate has limited benefits.
The weir and concrete footings of the gate are owned by B&NES. We own and operate the metal element of the gate.
Large costs to maintain
Difficult structure to maintain due to limited access.
Health and safety issues of operating the structure and for the public.
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How a radial gate operates
Twerton Sluice Gates Twerton consists of a vertical and radial gate.
This asset is approaching the end of its design life
The concrete footings are owned by the EA and First Group. The gates are owned and operated by the EA.
Twerton’s primary function is to maintain water levels upstream in Bath. This is for navigation and amenity purposes as well as protecting foundations of structures in the World Heritage Area.
In flood conditions the gates are opened to allow water to continue downstream. This operation is automatic and rises to changes in river levels.
If the gates were to fail shut in a 1in 100 year flood this would increase the risk of flooding to 240 properties.
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20 O
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2014
TECHNICAL DIRECTOR ANDY WALLIS
RIVER AVON OPTIONS APPRAISAL TWERTON AND PULTENEY GATES
• Pulteney and Twerton sluice gates are important, but degrading, assets
• Need to be considering now what the long term solutions are
• Complicated sites so need careful thought
• Lots of potential for improvement
BACKGROUND TO STUDY
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Flood extents in 1 in 100 event with and without Twerton Gates open
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Now is the right time
• Can link into other regeneration sites
• Potential for partnership funding
OPPORTUNITIES
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• Linkage to other plans and strategies
• Amenity/visual/biodiversity
• Do Nothing
• Do Minimum
• Refurbish current sluice
• Like for like replacement
• Hydropower
OPTIONS – BOTH SLUICES 20 October 2014
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What have we missed?
OPTIONS - PULTENEY
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• Replace with fixed crest weir
• Replace with lock gates
• Infill the land
What have we missed?
• Replace one or both gates with fixed crest weir
• Replace one or both gates with variable crest weir
• Lower the retained water level
OPTIONS - TWERTON
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• So far talked about long term options only
• Opportunity to work with adjacent stakeholders at both sites to come up with combined solution that deliver all, or part of the final solution.
QUICK FIX OPTIONS
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Which is most important? What have we missed?
EVALUATION CRITERIA
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GBV
Flood Risk
Fisheries
Public Realm
Amenity
Heritage
Energy Generation
Navigation/Moorings
Safety
Education
Costs
WHAT IS IMPORTANT TO YOU?
Over to you!
• Time for Q&A then split into groups
• Anything we have missed?
• What is most important to you?
• What are your concerns?
• How would you evaluate success on this project?
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30-40 minutes in groups to discuss the different options and prioritise the importance of the different criteria.
Group facilitator to feedback at end.
FEEDBACK
Group facilitators to lead
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NEXT STEPS
Thank you!
•Report and matrix of options by Christmas
• Further consultation at end of this stage on preferred options
•Detailed appraisal of small number of options in early 2015
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Bath and North East Somerset – The place to live, work and visit
Question & Answer