Case study:Southern Water Lukely Brook

Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Monitoring, Social benefits, Urban
Country	England
Main contact forename	Matt
Main contact surname	Dempster
Main contact user ID	User:Southern Water Catchment Team
Contact organisation
Contact organisation web site
Partner organisations	AtkinsRéalis, FiveRivers
This is a parent project encompassing the following projects

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Project summary

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The Lukely Brook is a Chalk winterbourne stream located on the Isle of Wight, flowing from the rural central downs north through Carisbrooke and into the Medina Estuary in Newport.

Southern Water operates two groundwater abstractions near to the Lukely Brook, which supply a large proportion of the Isle of Wight with clean drinking water. Southern Water has had a number of environmental regulatory undertakings as part of its AMP6 NEP (National Environment Programme) and AMP7 WINEP (Water Industry National Environment Programme), which aims to ensure that groundwater abstractions are environmentally sustainable in the long-term, and seeks to mitigate any quantified impacts resulting from water company abstraction on watercourses and the valuable ecological habitats they support.

under the AMP7 WINEP, Southern Water have undertaken a programme of ecological and hydro-geomorphological improvement works on the Lukely Brook between 2020 and 2024 to improve the ecological resilience of this chalk winterbourne stream and adjacent ecologically designated floodplain meadows. The environmental enhancement works include the removal of a weir, installation of three fish passes, two ‘Stage Zero’ floodplain reconnection schemes, realignment and reprofiling of a historically modified section of channel, and removal of a weir along with reprofiling of banks in a town centre public amenity space. The final element completed in 2024 was restoration of the river channel though a disused highways ford next to Southern Waters water supply works in Carisbrooke. Successful delivery of the scheme has been achieved through partnership working with the Island Rivers/Newport Rivers Group and continued positive engagement and consultation with landowners and other local stakeholders.

Monitoring surveys and results

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Project background

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Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category	500 - 1000 k€
Total cost (k€)
Benefit to cost ratio
Funding sources	Southern Water WINEP

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring

Catchment and subcatchment

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Catchment

River basin district	South East
River basin	Isle of Wight

Subcatchment

River name	Lukely Brook
Area category	10 - 100 km²
Area (km2)
Maximum altitude category	200 - 500 m
Maximum altitude (m)	216216 m <br />0.216 km <br />21,600 cm <br />
Dominant geology	Calcareous
Ecoregion	Great Britain
Dominant land cover	Arable and Horticulture
Waterbody ID	GB107101006250

Reasons for river restoration

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Mitigation of a pressure	Abstraction, Barriers to fish migration, Drinking water storage and supply
Hydromorphology	Connection to groundwaters, Flow velocities, Freshwater flow regime, Quantity & dynamics of flow
Biology	Fish, Invertebrates, Macrophytes
Physico-chemical
Other reasons for the project

Site

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Name	Lukely Brook
WFD water body codes	GB107101006250
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body	No
National/international site designation
Local/regional site designations
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

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Location: 50° 41' 27.13" N, 1° 18' 39.28" W

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Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information