SLIDE 1
Department of Infrastructure Castletown
Tidal Flooding & Sea Defence
August 2014
2002
- Tide model created
- Storm Surge Model
- Flood Maps
- 2002 prediction
accuracy +- 500 mm Meters
- 2014 prediction
accuracy +- 50 mm
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Department of Infrastructure Castletown Tidal Flooding & Sea - - PowerPoint PPT Presentation
Department of Infrastructure Castletown Tidal Flooding & Sea - - PowerPoint PPT Presentation
Department of Infrastructure Castletown Tidal Flooding & Sea Defence August 2014 2002 Tide model created Storm Surge Model Flood Maps 2002 prediction accuracy +- 500 mm Meters 2014 prediction accuracy +- 50 mm 2
SLIDE 2
SLIDE 3
January 2014
- Flooding areas
– Hope Street – Back Hope Street – Springfield Terrace – Victoria Road – Milner Terrace – Athol street – Brewery Walf
- Tidal Overtopping
– Douglas Street – The Promenade
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SLIDE 4
January 2014 Structural Damage
- Damage to sea wall
at St Mary’s Car Park
- Damage to
breakwater
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SLIDE 5
Lessons Learnt/Improvements
- Shortage of sandbags
- Poor communication
– Government – Businesses, Residents and LA’s
- Understanding of the
flooding routes
- Drains, Lanes, Roads
- Area Protection
works
5 J Robinson
SLIDE 6
February 2014
- Improved flood protection at
end of Hope Street.
- Gullies and manholes
covered to prevent backing up.
- Early deployment of
sandbags and increased availability
- Improved communication
with businesses, residents and local authorities
- Pre-planned road closures,
advertised in advance
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SLIDE 7
St Mary’s Car Park
- Castletown Commissioners
reconstructed the sea wall and car park
– 250T of temporary rock armour to protect the area – Construction of new retaining wall – Improved land drainage – Increased car parking – Viewing area being created
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SLIDE 8
Tactical Improvements Since January
- 20,000 filled
sandbags
- Flood barriers
- Portable flood
barriers
- Maintenance of
non-return valves to harbour
- Pre-planned
road closures
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SLIDE 9
Portable Flood Barriers
- Demountable flood
defence barrier
- Rapidly deployed
- Flexible, easy
connection to walls
- Pods fill with rising
flood waters
- 900 mm high units
- No bolting or
construction work needed
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SLIDE 10
Fixed Flood Barriers
- Permanently fixed wall
channels
- Lightweight aluminium
panels
- Durable rubber seals
- Units locked in place
with compression screws
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SLIDE 11
Policy and Strategy Development
- A high level cost
benefit analysis complete
- Investigation of
defence options and budget costs commissioned
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SLIDE 12
Up Coming Tides
- Tide height
– 10-15 August 14 – 13th- Chart 4.15 m – 8-12 September 14 – 11th Chart 4.21 m
- Castletown Harbour
typically 0.40-0.50 lower than above
- This only starts to be
predictable 36 hours
- ut
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SLIDE 13
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