This project, for the National Trust at Morden Hall Park, involved the design and build of a low head micro hydro-electric Archimedean screw turbine.
The turbine is located on the left bank of the River Wandle and is part of Snuff Mill, a listed building. It aims to generate 310,000kWh of electricity a year – enough to power 80 homes - and sufficient to power the Park's award-winning visitor and education centre. The turbine uses a 'fish friendly' Archimedean screw which will save the equivalent to 170 tonnes of CO2.
The works included:
• The installation of a low head micro hydro-electric Archimedean screw turbine located within a new reinforced concrete channel and surrounding fencing
• A Larinier fish and eel pass, trash screen and sluice gate
• Alteration and formation of a new sidespill weir to serve the new channel
• Construction of new bridge and generator shed
• All associated controls, sensors, generation gear and electrical connections
Reinstatement of parkland
All works had to be carefully monitored for vibration impacts with piling taking place within 5m of a listed building. Careful control of public access and deliveries along the access track to the site was also necessary as the park was open to the public throughout construction.