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Concept
Loch Thom
Summary
Loch Thom is a reservoir which since 1827 has provided a water supply to the town of Greenock in Inverclyde, Scotland. It is named after the civil engineer Robert Thom who designed the scheme which created the reservoir and delivered water via a long aqueduct known as The Cut. Today, as well as providing a water supply, the loch is used for sport fishing and forms part of the Clyde Muirshiel Regional Park with several attractive walks and a centre at Cornalees Bridge providing nature study facilities.
The loch is about 2.4 km from north to south, curving to the east in a rough C-shape, and is at an elevation of about 195 m above sea level. From the northern arm an outlet feeds southwest a short distance to a compensation reservoir at the centre of the "C", which then connects at Cornalees Bridge to the start of The Cut.
In the late 18th century Greenock was a rapidly expanding seaport with industries developing as the industrial revolution gathered pace. Its location on the north slopes of hills sweeping down to the south bank of the Firth of Clyde meant that several fast flowing streams provided supplies, and a number of wells provided clean water for domestic use. This was supplemented in 1773 by a piped water system designed by James Watt supplying some areas, but there was increasing demand for water powered mills.
On the far side of the hills to the south of the town a natural dip held a freshwater lake known as Shaws Water at a level high above the town. The civil engineer Robert Thom from Rothesay prepared a scheme to turn this into a reservoir and create the aqueduct which became known as The Cut.
The Shaws Water Joint Stock Company named by Sir Michael Shaw Stewart, 5th Baronet and friends, which was incorporated on 10 June 1825 with capital of £30,000. The scheme was officially opened on 16 April 1827. On that day a grain mill, paper mill, power loom manufactory and a sugar refinery made use of the power from the water running north down to the sea for a vertical height of around 170 m, at a rate of about of water per day.
Official source
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