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This publication is available at https://www.gov.uk/government/publications/romsey-flood-alleviation-scheme/romsey-flood-alleviation-scheme
The Environment Agency is working in partnership with Hampshire County Council, Test Valley Borough Council, local flood action groups and other partners to develop a permanent flood scheme for Romsey.
This is in response to the flooding that occurred in the town over the winter of 2013 and 2014. During this event, 36 residential properties and 44 commercial properties were reported as being flooded. The Environment Agency has historical records which indicate that prior to the winter of 2013 and 2014, flooding occurred in Romsey in the 1960s,1995 and 2000 to 2001.
The main flood risk in Romsey is from the River Test. As a chalk river, the Test is influenced by high groundwater levels in the underlying chalk during prolonged heavy rainfall.
The majority of the flood risk lies to the west of the town as it follows the main River Test channel and its various tributaries. To the east of the town, the main flood risk from rivers is located around the Tadburn Lake Stream, running from east to west and converging with the main River Test south of the A27.
During a flood event the area known as Fishlake Meadows and fields to the west of the town act as a flood plain by filling with, and storing, water.
Surface water flooding can occur when the highways drainage network becomes overwhelmed and unable to cope. This happens when the volume of water needing to drain away (from usually intense storms) is greater than the capacity of the drainage system. Surface water flooding can also occur when the ground is saturated from previous rainfall. This results in rainfall being unable to soak into the ground and flows along the surface instead.
The proposed scheme includes fluvial and surface water elements which work in conjunction with each other to reduce the risk to 87 properties.
Fluvial elements include:
- A flow-control structure at the opening of the Fishlake Stream on the River Test (north of the town). This will help to manage river flows directly through the town during future flood events.
- A sluice gate over the existing culvert outlet immediately north of Timsbury Bridge on the River Test.
- A series of earth embankments within the floodplain to manage overland flows.
- Additional culverts to improve drainage from the floodplain through and around The Causeway.
- Demountable defences (removable defence) along Greatbridge Road (north of Timsbury Bridge) and Riverside Gardens.
- Individual property flood resilience.
Surface water elements
- Additional drainage and kerb raising in the Mainstone area to improve the highway drainage, and to prevent flows to properties set at a lower level to the existing highway.
- An overland flow route directing water away from a low point on the existing A27 highway by Mainstone.
- An overflow pipe under the existing A27, where the stream is currently culverted under the existing highway.
The highway drainage will also be improved in Middlebridge Street. The Environment Agency will continue to work closely with Southern Water and their partners at Hampshire County Council on securing a funding package to progress the works in Winchester Road to improve the capacity of the underground pipe.
The Environment Agency and project partners will be holding a public information event on the following dates at Crosfield Hall, Romsey:
- Wednesday 11 October (The Main Hall), 1pm to 4pm.
- Thursday 12 October (The Annexe), 10am to 1pm.
- Friday 13 October (The Annexe), 4pm to 8pm.
- Saturday 14 October (The Annexe), 10am to 1pm.
For more information about the scheme, please contact the Romsey flood alleviation scheme project team at the Environment Agency on 03708 506506 or email firstname.lastname@example.org.
Romsey District Office