 The moveable weir at Knostrop, part of the River Aire flood alleviation scheme, was lowered to reduce the water level upstream.The Derwent flooded, and parts of Matlock were submerged as a month's worth of rainfall fell in a day.A woman swept away when wading through fast moving floodwaters and found dead later the same day was named as a former High Sheriff of Derbyshire, Annie Hall.