Detailed River Network v3

The Detailed River Network (DRN) is the only large-scale, accurate and fully attributed digital river centreline covering England and Wales.

The DRN is captured from the water features theme of the OS MasterMap topographic layer and built into a network using automated rules. Other input datasets and extensive local Environment Agency staff knowledge has been used to augment the core geometry to incorporate critical spatial detail and attribution, such as flow direction and path, not available from the OS mapping and to verify the accuracy of the centreline itself.

There are 3 geometric layers associated with this product:

1. The DRN itself comprises the connected river centreline geometries, as a polyline.
2. Nodes are the junction and pseudo node references as from and to nodes in the DRN.
3. Offline Drainage features are the sections of surface water (usually drains and ditches) which have no or uncertain connectivity to the rest of the on line river network.