Black Brook — flows from Great Hill through White Coppice (where it is known as Warth Brook), and lesserly from Eagle Tower at Heapey. The brook joins the river at the Yarrow Bridge prior to entering Duxbury Woods. The brook has today more flow than the Yarrow, due to the large amount of water removed from the Yarrow for consumption. In fact, the Yarrow flooded when Anglezarke Reservoir was drained in 2002, waterlogging the fields at Nick Hilton's Bridge.