Here is Black rock lave net fisherman Martin's trip up to see the Severn bore yesterday morning . As the river is narrower here slightly more impresive than the bore at Newnham an hour previous . The Severn estuary has the second greatest tidal range in the world and as the flooding spring tide is forced up the estuary the funnelling effect causes the wave. www.blackrocklavenets.co.uk | Black rock lave net heritage fishery