The previous scheme
The following is taken from "Ostend to Cart Gap Strategy Study - Executive summary, Report EX 4342 November 2001" by HR Wallingford, available in full: http://www.northnorfolk.org/coastal/doc10.pdf (2.7MB)
6.2 Preferred management programme
The following points summarise the management programme and should be reviewed in conjunction with Figures 8 and 9.
Stage I of the works is to construct a groyne (preferably of rock) at the south-eastern end of Beach Road, aligning with the existing Groyne 48a and extending back so as to protect the exposed cliff face and protect the whole frontage from south-easterly wave action. Simultaneous construction of two upper beach groynes between the timber revetment and the cliff is also proposed. To minimise costs, these may be formed from Geotubes and their role is to prevent movement of upper beach material and so help to maintain a higher beach level in front of the cliffs. The most northerly of these two groynes is just northwest of the beach access ramp and hence within the SSSI. The function of this groyne will be to limit the movement of sediment under the access ramp and help to stabilise the cliffs for a short distance northwestwards towards the Happisburgh Caravan Park.
In the event that Stage I works are insufficient to prevent continued erosion, Stage II works may be undertaken. If the Stage I groyne is effective, but only over a limited length then a second groyne may be constructed (refurbished / extended) midway between the rock groyne and the beach access ramp (existing Groyne 47a). This will help to maintain an extended beach over the full Beach Road frontage.
In the event that Stage II works are still insufficient to prevent erosion, then Stage III works may be undertaken. Stage III works comprises the construction of a rock sill between the timber revetment and toe of the cliffs. This sill may extend between the rock and midway groyne, or between the midway groyne and beach access ramp, depending upon the performance of the Stage II works. It is anticipated that, if required, this sill would most likely be placed between the rock and midway groynes.
Monitoring of the whole frontage is proposed. Progressive failure of the timber revetment may lead to accelerated erosion in some areas. Under these circumstances, and depending upon the location, it may be better to remove defences elsewhere so as to manage the coastal erosion. By protecting the Beach Road frontage and allowing defences elsewhere to deteriorate, erosion of farmland south-east of both Ostend and Happisburgh will occur.
Erosion of the frontage by the sea wall near Cart Gap is not anticipated to be a problem. However, these defences should be monitored to ensure that erosion does not occur and threaten the defences.
Erosion south-east of Ostend will be severe once the timber revetment fails in this area. The policy within the adjacent management unit is one of hold the line to defend housing built close to the cliff edge. Care will be required to ensure that defences are not outflanked by processes similar to those south-east of Happisburgh.