Mapledurham Estate was granted planning permission to replace an old turbine which
is located behind the watermill. The existing turbine was installed in the 1920's
and supplied the manor house with electricity for many years, but fell into disrepair.
Installing a new Archimedese turbine underneath the watermill has provided the estate
with a permanent income from the electricity which will be sold to the national grid.
It has been a fascinating project since it started in Autumn (2010).
It involved demolishing the existing turbine building and removing from the river
bed the old turbine,
Draining the mill pond and approach to the mill for several months to commence structural
work beneath the mill.
Creating a temporary bridge to allow machinery access onto the mill island.
Installing an Archimedes turbine approx 6 metres long and 4 metres wide weighing
Rebuilding the turbine building with the correct materials to match the mill buildings.
All work has been carried out extremely carefully and sympathetically due to the
mills listed building status, however timing was crucial as all the time the work
proceeded there was the risk of flooding especially if the project over ran into
In Spring 2012 Mapledurham Turbine was the biggest operational on The River Thames
It generates 2000 KW/hrs every 24 Hrs
It weighs 24.7 Tonnes
Flow rate: up to 8000 litres per second ( 280 Olympic swimming pools per day)
It generates enough power for about 140 homes
Diameter is 3.6 metres
At time of inauguration, this was the largest Archimedes screw turbine of its type
in this country