and Water Works Facilities Act 1870, Kitcliffe Reservoir and Ogden Reservoir were built below Piethorne Reservoir and Oldham Corporation Waterworks was required to discharge one million gallons a day into the brook. Lower tributaries Rag Hole Brook, whose name derives from the Lancashire dialect word "rag", meaning hoar frost, enters Ogden Reservoir. Wickenhall Brook is the major lower tributary. Its source is in high moorland near the A640 Huddersfield Road, in Little Rochdale Parish. After passing beneath the road, it flows down a deep clough, feeds two former mill ponds, is culverted beneath the site of a former mill and print works, and is finally culverted at Lanebottom, before flowing down to join Piethorne Brook before Ogden Mill. An overflow drain arcs round to Ogden Reservoir. It falls 200 m (610 ft.) in a little over 2 km (1.3 miles). Wickenhall Brook is named after the Lancashire dialect word "wicken", meaning rowan or mountain ash, found in its Clough at a place called Wicken Hole. Tributaries Haugh Brook Wickenhall Brook Rag Hole Brook (Into Ogden Reservoir) Tom Brook (Into Kitcliffe Reservoir) Cold Greave Brook Little Whinning Gulf Great Whinning Gulf Ashworth Brook Griffiths Brook Gallery See also Piethorne Reservoir River Beal References Rivers of Greater Manchester Rivers of the Metropolitan Borough of Rochdale Rivers of Milnrow and Newhey 2