What shape and size is the bed load of the river Severn?

The bed load of the River Severn typically consists of a mix of sediment types, including gravel, sand, and pebbles, which can vary in size from small grains to larger stones. The shape of these particles is often rounded or sub-rounded due to the processes of erosion and transport along the riverbed. The specific size and shape can change depending on the location within the river and the energy of the water flow, with coarser materials generally found in faster-flowing sections.