content@managingwater.co.uk Fish Passes & River Structures
River structures in domestic hydro- elelctric power generation scheme.
by MIKE COOPER, AGA
Mill House is situated bankside of the River Wey in Surrey and was originally part of a flour mill built c.1768, rebuilt 1876, and demolished in1922. The wheel house, still part of Mill House, initially held a 15 ft. breast shot water wheel.
A.G.A. Bioengineering Systems Ltd. were appointed CDM Contractors for the project which required the disciplines that brought together sound engineering practices while at the same time ensuring wherever possible, that the work carried out would protect, maintain and improve the environment. Priority had to be given to conform to EU & Environment Agency directives, while at the same time, the planning permission for hydro generation required consideration which catered for the migratory habits of fish and eels.
The installation of the hydro-power generator delivers electricity to the client while surplus supplies are sold on to the National Grid.
Initial work required the excavation and construction of a channel emanating from the main water course, designed to house the Archimedes screw driven generator. The outflow from the screw is discharged into the adjacent mill pond via a new sluice gate into a bypass stream.
Incorporated into the scheme is a geo-thermal heating system installed within the structure built for the Archimedes turbine. A steelwork frame holds the stainless steel geo-thermal heat panels from which a heat pump then transfers energy to domestic quarter’s central heating system.
The Archimedes screw generator from Mann Power Consulting Ltd has a power output of 11KW and is designed for a flow head of 1.5m and the capacity of 1,100 l/s. Anticipated annual CO2 saved: 32 tonnes. The system was hoisted onto the site with a telescopic crane and located into the turbine channel. A steel trash screen was built into the inlet to exclude heavy debris.
The old wheel house was completely refurbished and is used to house the hydraulic sluice and the control system for flow management and minimisation of flood risk. The Achilles screw speeds are adjusted to maintain defined upstream river levels, thus during peak flows, once the screw reaches max speed, sluice gates open to maintain optimum water levels.
To protect migratory and course fish populations a reinforced
concrete fish pass was constructed 200m upstream, well clear of the turbine channel.
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