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The Gauging Basin at Bottoms Reservoir
When Bottoms Reservoir was built in the 1870's the owners of the mills further down the river Etherow insisted on the Gauging Basin being built. This was to make sure adequate water was paid into the river as 'compensation' for that impounded in the reservoir. Without this the dam would stop the natural flow of water supplying the mills with power. To ensure the millowners obtained the water due to them, the gauging basin would be filled with water for a certain time and a secret depth gauge would check whether the flow of water was correct.