Man-made structures

The third tab contains more detailed information on made-made engineering structures.  

The number of in-channel structures, and the extent of bank and channels modifications are shown using colour-coded bar charts (green: extent less than 30%; yellow: between 30% and 60%; red: extent greater than 60%).

The terms 'major' and 'intermediate' used to qualify in-channel structures refer to the RHS and reflect the size and impact of the structures on channel hydrology and morphology (see RHS manual).