by Robin Whittle
Low tide adjacent to Sutton marshes
The Deben became tidal at Felixstowe Ferry about 6000 years ago. Today the river is tidal up to Ufford, two miles upstream of Woodbridge. During this period sea borne sediment has built up the saltmarsh in the lower reaches to a depth of 12m.
Over the last 500 years river walls of mud and clay have been built along both sides of the tidal estuary to create arable land and grazing marshes. Since then, sediment has continued to build up the saltmarshes and mud flats lying in front of the river walls. However, saltmarsh is now under increasing attack from wave action and shore crab burrowing. Continue reading