CalderWeb allows you to visit the River Calder, to look at maps and photographs, to examine data and read a commentary. This virtual visit can be used to discover and study the River Calder and its tributaries in Kirklees. The site is targeted at visitors studying rivers and water quality in upper secondary schools.

Kirklees is a district within the county of West Yorkshire, England. It is a region of transition comprising of three main zones: the high plateaux of the Pennine hills; the narrow band of steep slope lands on their flanks and the lowlands to the east. The main towns within the district are Huddersfield and Dewsbury.

The rivers Holme, Colne and Fenay Brook, which are tributaries of the Calder have cut deep valleys on the Pennine slopes. These rivers provided the source of of clean water and power which caused the woollen textile industry to develop in this region. In the east The Spen flows into to the Calder along a broader valley. You can take a virtual trip along the Holme, Colne and Calder.

The Calder itself rises further to the north near the Pennine town of Todmorden, in the neighbouring district of Calderdale. It flows through the West Yorkshire connurbation towns of Halifax, Brighouse, Huddersfield, Dewsbury and Wakefield before joining the River Aire at Castleford. It covers some 87km between its source and the confluence with the Aire.