Case study:Mill house private hydroelectric power generation scheme and fish pass

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Location: 51° 9' 42.96" N, 0° 48' 19.29" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Hydropower
Country	England
Main contact forename	Ash
Main contact surname	Girdler
Main contact user ID
Contact organisation	AGA Group
Contact organisation web site	http://http://www.agagroup.co.uk/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Plan of works at Mill House (image courtesy of A.Girdler at A.G.A Group). Picture reference - see "Project summary"

Project summary

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Mill House is situated on the banks of the River Wey in Surrey. The wheel house, which is still part of Mill House, had historically held a 15 ft. breast shot water wheel. The aim of the project was to once again put the River Wey to use producing energy, via the installation of an Achilles screw turbine. The scheme also incorporated a geo-thermal heating system installed within the structure for the turbine, with a heat pump to transfer hot water to the domestic quarter's central heating system.

The old wheel house was reinforced and refurbished to accommodate the new hydraulic sluice gate housing and the controls to regulate water levels and flow rates to the turbine channel. A requirement of planning permission was to incorporate a fish pass into the design to ensure the protection of migratory and course fish populations. A reinforced concrete fish pass was construction 200m upstream clear of the turbine channel. One of the key elements to the successful operation of the fish pass channel is the installation of artificial plastic reeds referred to as "fish brushes". These fish brushes slow the water flow down and create eddies and back currents to enable fish to swim up the pass.

A range of bioengineering systems were used to prevent erosion and undercutting of the banks along 200m of the clients bank. Products included unplanted and pre-vegetated coir rolls, A.G.A. Span vertical revetment, rock rolls and hardwood fagots, each used according to the dictates of the site conditions and habitat creation required. As a result of these activities new habitat has been created, water meadows restored and the bio-diversity of the project site enhanced.

Picture reference:

A. Reinforced concrete hydro channel 300mm thick walls with 500mm deep base for turbine

B. Reinforced concrete fish pass

C. Hydraulic sluice gates

D. Waterside decking

E. Two steel and oak bridges

F. Restored iron footbridge

G. Bank erosion control

H. Vegetation and turf reinforcement

I. Water meadow reinstatement

The RRC would like to thank A.G.A Group for providing the information and photographs for this case study.

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Image gallery

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Fish pass construction (image courtesy of A.Girdler at A.G.A Group)

Bioengineering techniques used (image courtesy of A.Girdler at A.G.A Group)

Bioengineering techniques used (image courtesy of A.Girdler at A.G.A Group)

Fish pass (image courtesy of A.Girdler at A.G.A Group)

Fish pass (image courtesy of A.Girdler at A.G.A Group)

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Thames River basin Wey Subcatchment River name South Wey (River Slea confluence to Tilford) Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 259259 m <br />0.259 km <br />25,900 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Broadleaved Woodland Waterbody ID GB106039017780 Site Edit site Name Mill house on the River Wey WFD water body codes GB106039017780 WFD (national) typology WFD water body name South Wey (River Slea confluence to Tilford) 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) Project background Edit project background Reach length directly affected (m) 500500 m <br />0.5 km <br />50,000 cm <br /> Project started 2011/08/01 Works started Works completed Project completed 2012/04/01 Total cost category Total cost (k€) Benefit to cost ratio Funding sources privately funded by property owner Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design AGA group Stakeholder engagement and communication Works and works supervision AGA group Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydropower Hydromorphology Continuity for organisms Biology Fish Physico-chemical Other reasons for the project bioengineering techniques used to improve bankside habitats and create water meadow Measures Edit Measures Structural measures Bank/bed modifications Bank improvement, Bank stabilisation, Bank protection Floodplain / River corridor water meadow creation Planform / Channel pattern Bypass channel 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