The Devonport Leat was a leat constructed in the 1790s to carry fresh drinking water from the high ground of Dartmoor to the expanding dockyards at Devonport, Devon, England. It is fed by three Dartmoor rivers: the West Dart, the Cowsic and the Blackabrook (this last apparently was the first portion to supply Plymouth Dock, officially renamed as Devonport on 1st January 1824). It was originally designed to carry water all the way to Plymouth Dock but has since been shortened and the operational part of the leat now stops near the Burrator dam. The water goes via underground pipes to the water treatment works at Dousland with the excess going into the Burrator Reservoir which provides most of the water supply of Plymouth. For part of the route to Dousland the pipes utilise the route of the old Plymouth Leat and the route of the disused Yelverton to Princetown Railway. Prior to the installation of the piped supply to Dousland the water was used for a hydro electric turbine located near Yelverton Reservoir and fed by a 12-inch-diameter (300 mm) pipe.