Romsey flood alleviation scheme

Last update: August 2020

Scheme overview

In the winter of 2013/2014, Romsey was badly affected by flooding with 36 homes and 44 commercial properties reported as flooded from a mixture of groundwater, sewer, surface water and fluvial sources. Hampshire County Council has been working with the Environment Agency and Test Valley Borough Council to develop a series of measures to manage flooding from all sources in the area.

Work at Mainstone junction has now been completed. Hampshire County Council has appointed Mildren Construction Ltd to undertake the next phase of works - drainage improvements in Middlebridge Street due to start on 7 September and scheduled for completion in 2021. This will include the installation of new gullies and pipes, new drainage channels and pipe replacement and ancillary works.

The work will be carefully programmed to minimise disturbance to the local residents and businesses. Working hours will be between 8:30am and 5:30pm from Monday to Friday.

The £6.2 million project has been partnership funded with £1.499 million from Hampshire County Council and £325k from Test Valley Borough Council. An additional £1.157 million was provided by local levy from the Southern Regional Food and Coastal Committee with the remainder coming from central government funding.

Scheme design

The scheme covers three key areas of construction to reduce the risk from flooding:

  • works along the main River Test to reduce the risk of river flooding: the River Test works will consist of a flow control structure at the top of the Fishlake Stream (near World of Water) to restrict the amount of water going directly through the town in future flood events. This will allow the floodplain to the west to fill up and direct the flood waters away from the Budds Lane area of Romsey. Drainage of the floodplain back into the main river south of the town will be improved through the provision of two spillways along the Causeway.
  • highway works at Mainstone: works will include improvements to the highway drainage network and additional points of discharge to the local ditch network, to reduce risk from surface water flooding
  • improved drainage at Middlebridge Street: works will include improvements to the highway drainage network and additional points of discharge to the River Test via Holbrook Stream, to reduce risk from surface water flooding

The Environment Agency has appointed Team Van Oord in conjunction with Mackley to deliver the flood defence works along the main River Test. The main compound will be located at World of Water with a number of satellite compounds at key locations around the town.

Hampshire County Council appointed Dyer and Butler to complete the work for Mainstone, which began in late 2019. A significant part of this work has already been completed. Following guidance from central government, work was temporarily paused at the outbreak of Coronavirus, however will recommence mid-May 2020, with the contractor following government guidelines on safe working practices at this time. Remaining work involves repairing and replacing highway drainage pipes and will involve some temporary partial road closures.

Initial exploratory work at Middlebridge Street will begin in June 2020, with some temporary parking restrictions. It is anticipated the main works will begin late summer 2020. Further information on this will be shared once a contractor is appointed.


Environment Agency: Romsey flood alleviation scheme

The package of measures was submitted to Test Valley Borough Council for planning permission in May 2018. The details are available to view on Test Valley Borough Council’s planning portal under reference 18/01320/FULLS.

Download the exhibition scheme boards

Environment Agency presentation - February 2019

In addition, the County Council is working with Southern Water and the Environment Agency to identify and agree a strategy to develop proposals for work in a fourth area, Winchester Road.

The total number of properties that will be better protected once all the measures are implemented will be 186. In addition, the improvements will ensure that the highway network can remain open, minimise the impact on the local economy, and reduce costs, distress and disruption associated with any future flood event.

Temporary Defence Deployment Plans (TDDP) for Greatbridge Road and Riverside Gardens have been prepared in order to inform the response by the emergency services in the event of a future flooding event.

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