The drainage will help disperse excess ground water and a specialist flexible waterproof liner mat will be used to re-line and seal the canal.

BBC: Work starts to repair breached Trent and Mersey Canal

Besides the unsightly effects that many mines have on the landscape, they usually churn out vast quantities of toxic waste in the form of acidic drainage-water and tailings the fine particles of rock produced when ore is ground down to release the minerals it contains.

ECONOMIST: Mine pollution