| The coal mining industry depended on using soughs until the mines became too deep to be drained by this means. |
| Other soughs were dug, including one in 1729 to drain the Worsley mines and another from Standish Colliery to the Leeds and Liverpool Canal at Crooke. |
| Soughs were typically dug from their open end near a stream or river back into the hillside beneath the mine to be drained. |
| By digging soughs, miners found they could lower the water table and allow mines to be worked deeper. |
| Some soughs include branches to facilitate further drainage. |
| It is only when the northeaster soughs in the eaves and brings him leisure that he drops into narrative. |
