Gosport FCERM Schemes

Coastal Defence Improvements in Gosport

Gosport Borough Council (GBC) are undertaking a project to improve the sea defences at three Gosport sites; Forton, Seafield and Alverstoke. Once built the schemes will reduce tidal flood risk to over 500 Gosport homes until 2060.

We have secured £545k of funding from the Environment Agency for the Alverstoke scheme and £650k for the Forton Scheme. These funds have progressed the detail design and will also be used to construct both schemes. We have also secured £227k of funding to progress the Seafield scheme to enhanced outline design. We are actively working within the council and with external partners to explore opportunities to maximise contributions and funding opportunities for these schemes.

The Alverstoke and Forton schemes have been progressing since their approval in 2016, we have now reached the end of the detailed design stage with finalised designs created for both locations. We are now procuring the construction works, including appointing a suitable construction contractor as well as obtaining the necessary licensing and consents for the schemes. The construction is planned to commence in early 2021. 

The enhanced outline design for Seafield has now been completed, the next steps for this scheme is to obtain suitable funding to allow the project to move to the detailed design phase. 


Why do we need to improve the coastal defences?

The current coastal defences at Alverstoke, Seafield and Forton are nearing the end of their usable life and have been identified as "vulnerable areas" in which there is significant risk of tidal flooding. 

Alverstoke

114 properties in Alverstoke are at present day risk from a 1 in 100 year flood event. This is expected to increase to 142 properties by the year 2060. 

Alverstoke Flood Numbers Alverstoke Flood Numbers

Properties and assets at risk from coastal flooding in Alverstoke include:

  • Residential and commercial properties 

  • Allotments

  • Approximately 30 listed buildings

  • Existing recreation ground and sites of environmental importance

  • A cemetery

Critical infrastructure and extensive urban utilities and services:

  • Anglesey Road

  • Three electricity sub-stations 

  • Surface water pumping stations & sewers

  • Pressure gas mains

  • Telecoms and cable networks 

Gosport Scheme Alverstoke Flood Extent present day Gosport Scheme Alverstoke Flood Extent present day
Gosport Scheme Alverstoke Flood Extent 2060 Gosport Scheme Alverstoke Flood Extent 2060

Forton

72 properties in the Forton area are at present day risk of flooding from a 1 in 100 year flood event. This is expected to increase to 232 properties by the year 2060.

Forton Flood Numbers Forton Flood Numbers

Properties and assets at risk from coastal flooding in Forton include:

  • The residential area of Forton 
  • St Vincent’s Sixth Form College 
  • Areas of open space and recreation ground 
  • 4 listed and 2 local listed buildings 

Forton Lake – a sensitive site that is environmentally designated 

Critical infrastructure ad extensive urban utilities and services

  • The A32/Forton Road
  • Three electricity sub-stations 
  • Surface water pumping station & sewers 
  • Pressure gas mains 
  • Telecoms and cable networks 
Gosport Scheme, Forton Flood Extent Gosport Scheme, Forton Flood Extent
Gosport Scheme, Forton Flood Extent 2060 Gosport Scheme, Forton Flood Extent 2060

Seafield 

80 properties in Seafield are at present day risk from a 1 in 100 year flood event. This is expected to increase to 193 properties by the year 2060.

Seafield Flood Numbers Seafield Flood Numbers

Properties and assets at risk form coastal flooding in Seafield include:

  • The residential area Seafield 
  • Access roads in and out of Seafield 
  • Areas of open space and recreation ground 
  • A large industrial site to the north of the tidal flood extent 

Critical infrastructure and urban utilities and services 

  • Three electricity sub-stations 
  • Foul water sewers 
  • Surface water sewers 
  • Low pressure gas mains 
  • Telecoms and cable networks
  • Haslar Lake and Workhouse Lake – sensitive sites that are environmentally designated 
  • Haslar Peninsula Conservation Area 
Gosport Scheme, Seafield Flood Extent present day Gosport Scheme, Seafield Flood Extent present day
Gosport Scheme, Seafield Flood Extent 2060 Gosport Scheme, Seafield Flood Extent 2060

Design Overview

Coastal Partners have worked closely with consultant engineers Mott MacDonald on the detailed design. The following gives an overview of the works planned at Alverstoke and Forton.

Alverstoke

  • The Scheme at Alverstoke will cover approximately 120m of coastal frontage at the western end of Stoke Lake.
  • The design includes a new L shaped reinforced concrete wall behind the existing wall at the west end of the lake. 
  • The design also includes the installation of a set of double leaf floodgates on Little Anglesey Road, which are to be operated by Gosport Borough Council (GBC) in the event of a flood warning.  
Gosport Scheme, Alverstoke, Wall Visualisation 1 Gosport Scheme, Alverstoke, Wall Visualisation 1

Forton

  • The Scheme will cover approximately 400m of coastal frontage in St Vincent’s College at the western end of Forton Lake. 
  • The design at Forton includes a new L shaped reinforced concrete wall which will be set back from the existing flood protection. 
  • The design also includes sections of road raising and removable flood equipment as well as repairs to some of the existing flood defences. 
Gosport Scheme, Forton Visualisation Gosport Scheme, Forton Visualisation