Question to the Department for Transport:

To ask the Secretary of State for Transport, what steps National Highways is taking to record the potential impact of historic drainage networks associated with major roads on (a) downstream flooding and (b) river pollution.

National Highways’ (NH) standard practice is to report all flood events on the Strategic Road Network (SRN). This includes flood events within 200 metres of the SRN, or within 500 metres of a NH drainage asset. All such flood events are recorded in NH’s drainage data management system (DDMS). NH also maintain drainage and water quality records on its DDMS.