The Calder catchment includes the main River Calder which originates from the moorlands surrounding Nelson, Burnley, Colne and Accrington, before joining the Ribble below Whalley. All the tributaries that flow into the River Calder such as Pendle Water, Colne Water and Hyndburn Brook are also in this area. Historically this area was heavily industrialised (mill workings, paper production and so on) and much of the Calder and its tributaries were altered and impacted by industrial and urban development. The catchment is predominantly urban.
The main issues in the Calder catchment are:
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