Isle of Wight Management Scheme

Seagrove Bay

• Crumbling sea wall and unstable slope.
• Chose to 'hold the line'.
• Scheme cost just under £1 million and was completed in 2000.
• New concrete sea wall, wiht 200m of rock revetment placed in front of the wall to dissipate wave energy.
• Rock Gryones.
• Land Drainage, significantly reduced mass movement of soft clay.

Seaview

• Scheme cost £4.7 million and was completed in 2004.
• Consists of 550m stone faced conrete sea wall and rock revement. 

• Ageing sea wall, in danager of collapse which would reactivate landslides.
• Property on the cliff was becoming unstable.
• Scheme completed in 2000 costing £1.6 million.
• Rock Revement - 15000 tones of Norwegian granite placed seawards.
• Coastal slopes were regraded to make a shallower profile before installing land drainage.
•  Lead to a recovery in property values.

• Cliff failure resulting froma combinatation of high energy destructive waves and high rainfall.
• Scheme costed £1.4 million, however the value of property exceeded this.
• The scheme was completed in1992 but sedimentation of the rock gryones has been a problem.
• offshore breakwater has been put in.
• 6 rock gryones and a rock revement to reinforce the exisiting sea wall using 25000 tonnes of Norwegian granite.
• Beach nourishment using 40,000m^3 of sand and gravel, re-profiling the slope and installing land drainage.

• Where the A3055 passes over a chalk ridge at Afton Down it is now within 11m of the cliff edge.
• Sea defences would be econonmically unjustified and environmentally unacceptable.
• Stabilises the cliff top by anchoring the tope of the cliff face costing £750 000. 

• Coast protection and Slope Inprovement schem cost £6.2 million and was completed in 2004.
• Included 500m rock revement, extension system of drainage pipes and syphon drains reducing surface and groundwater levels, reducing landslides.  

• Existing wooden revetment were becoming progressively ineffective as the clay cliffs retreated.
• Property value in excess of £10 million was increasingly at risk as coastal processes activated ancient landslides.
• Land drainage was installed.
• Stabilising the slopes with thousands of tones of chalk.
• Rock revetment of Somersel limestone, aconrete walkway and a gabion wall.
• Scheme costed £2.3 million and was completed in 1996. 

• High energy waves were removing chalk blocks which protectedan acient landslide complex upoon which houses had been built.
• There was danger of landslides being reactivated.
• 31.2 million of Carboniferous limestone was brought in to construct 1 700m long rock revetment along the base of the cliffs using blocks weighing 6-8 tones.
• Limestone rock gryones were also constructed at 100m intervals at the base of the cliff.