Upper River Colne and Radlett Brook

Rising river levels throughout the evening may lead to flooding.  Flooding is possible from overnight on 12 March 2026 to the following morning.  Locations most affected will be low lying land and roads near rivers.  We are closely monitoring the situation .  Take care and avoid walking, cycling or driving through flood water and consider activating any flood protection products you may have  This message will be updated by 10:00AM on 13 March 2026 or as the situation changes.