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Horse Coppice Dam
Disley, Cheshire, UK
associated engineer
James Simpson
date  circa 1864
UK era  Victorian  |  category  Dam/Reservoir  |  reference  SJ967837
ICE reference number  HEW 1152
An earth dam of simple construction built under the auspices of the Stockport District Waterworks Act 1861. It lies south of Disley, next to Bollinhurst Dam and adjacent to Lyme Park.
The core of the earth dam is thin and made of puddle clay, as is the cutoff below it (the layer between the foundations and the earthworks that is designed to prevent seepage). The upstream slope is 2:1 and the downstream 3:1. The ashlar rock facing on the upstream side and the parapet wall are later in date.
The dam is 18.3m high and some 178m long. The original draw-off was a wet standpipe with draw-off valves at different levels, standing inside a concrete slot in the upstream slope.
In 1848, after 80 years of use, the reservoir was drained to fix leakages that had developed. A fracture was discovered in the outlet main, which was then repaired and some of the draw-off valves blanked off.
A dry valve shaft was built in 1955-59 together with a discharge tunnel to house the 460mm outlet main and to replace the original draw-off arrangements. Engineer James Simpson had described these as a 'draw-off tank' and they are similar to those used at his other projects in Bristol, Newcastle and York.
Research: PD
"Early Victorian Water Engineers" by G.M. Binnie
Thomas Telford, London, 1981

Horse Coppice Dam