A32 Farringdon flood alleviation measures

Works to reduce flooding in the Farringdon area

Flooding overview

In the winter of 2013 to 2014, the A32 highway, Lower Farringdon and the surrounding area was badly affected by flooding from a combination of rising groundwater and surface water. There is a long history of flooding in this area and the primary cause of this is the height of groundwater which is recharged by rainfall and generally varies slowly throughout the year.

Hampshire County Council has been working together with a number of different organisations including the parish council  to understand the cause of the flooding and has now developed a number of actions that can be undertaken in the short term to help alleviate flooding. These actions are being funded by the County Council at a total cost of £300,000. These actions will inform the development of longer term solutions that will provide a greater level of protection from flooding.

The works are to ensure the existing drainage system, which consists of ordinary watercourses, the main river and highway drainage can function to its maximum capacity. They include:

  • removing vegetation to ensure flow paths for water are clear
  • undertaking maintenance, clearance and surveying of existing ditches, culverts and pipes
  • replacing, upsizing and installing some new pipes or culverts

The improvements will reduce costs, reduce distress and disruption associated with future flooding, minimise the impact on the local economy and help to ensure that the highway network can remain open.

The organisations involved in the A32 Farringdon multi-agency group are:

  • Hampshire County Council (as Lead Local Flood Authority and Highway Authority)
  • East Hampshire District Council
  • Environment Agency
  • Thames Water Utilities Limited
  • Farringdon Parish Council
  • Chawton Parish Council
Project appraisal

Councillor Humby, Executive Member of Environment and Transport, approved a project appraisal of the scheme on 19 September 2017. The report provides an overview of the scheme and the estimated scheme costs of around £0.3 million. Additional funding or contributions will be sought from:

  • central government
  • the Thames Regional and coastal Committee
  • the multi-agency partners
Programme of works

The programme of works may need to change due to weather conditions or other unforeseen issues.

Milestone Timescale
Phase 1a: CCTV and land survey, trial hole investigations and ditching works Autumn/Winter 2017/18
Phase 1b: Culvert installation, further CCTV survey and some trial hole investigations Spring/Summer 2019

Plan showing the area of works. The plan may take several seconds to load. It may change following further discussions with the highway contractor.

Maintenance of ordinary watercourses

Watercourses are classified as either a ‘ordinary watercourse’ or ‘main river’. Ordinary watercourses are watercourses that are not part of a main river and include streams, ditches, drains, cuts, culverts, dykes, sluices, sewers (other than public sewers) and passages, through which water flows.

Hampshire County Council intends to work with riparian owners (those living adjacent to an ordinary watercourse) who are responsible for maintaining ordinary watercourses to ensure  that the performance of the existing ditches, particularly those adjacent to the A32, is improved and ensure that  future maintenance is undertaken at appropriate intervals.

See flood prevention guidance for further information.

Contact

Write to us at:

Flood and water management team
Economy, Transport and Environment Department
Elizabeth II Court West
The Castle
Winchester
SO23 8UD