How much do revetments cost UK?
Similarly precise costs can only be estimated, but typically they are likely to be between £5,000 and £10,000 per linear metre. Thus for the 9km of Pevensey Bay’s sea defences a sea wall could easily cost £75,000,000.
Are revetments expensive?
Revetments. Revetments are concrete (or in some cases wooden) structures that are built along the base of a cliff. Revetments are normally successful at reducing coastal erosion but they are expensive to build. Once built however, they don’t require as much maintenance as a sea wall.
What is the cost of revetment?
Revetment: Revetments are sloping concrete walls that are laid like a carpet along coastline; reduces the wave energy and stops Longshore Drift. Costs about £2000 per metre.
How effective are revetments?
They are very effective at protecting the coastline in the short-term as they are immediately effective as opposed to some longer term soft engineering methods. They are often intrusive and can cause issues elsewhere at other areas along the coastline.
What are the disadvantages of revetments?
DISADVANTAGES
- They are unattractive and require lots of beach space, both barriers to tourism.
- Revetments absorb energy unlike sea walls that reflect it, therefore they are subject to greater erosion and thus constant maintenance is required. This increases the expense.
Are revetments easy to build?
The revetments are usually placed at the top of the beach or at the bottom of the cliff, reducing the wave’s energy and reducing erosion where it is most needed. The good thing about revetments is that they are easy to build and can be constructed in a short amount of time.
How long does a revetment last?
Costs for timber revetments are dependent on design, dimensions, quality of materials and the requirement for skilled contractors. Life expectancy will range from a few years up to 30 years, depending on rates of shoreline erosion, cross-shore location of structures and quality of timber.
What is blast pens for fighter jets?
A blast pen was a specially constructed E-shaped double bay at British RAF World War 2 fighter stations, being either 150 feet (46 m) or 190 feet (58 m) wide and 80 feet (24 m) front-to-back, accommodating aircraft for safe-keeping against bomb blasts and shrapnel during regular enemy air-attacks.