Canvey Island barriers spanning Benfleet Creek to the north and East Haven Creek in the west. The drainage system consists of sewers, culverts, natural and artificial dykes and lakes which feed seven pumping stations and gravity sluices that discharge the water into the Thames and creeks. Four of the discharge sites are "high flow" stations capable of discharging 600 litres of water per second at any tide level. The levels within the system are managed by a further five "low flow" pumping stations. The Environment Agency's Thames Estuary 2100 flood defence plan includes Canvey Island as one site for alleviating the flood
Dyfi Estuary Mudflats Dyfi Estuary Mudflats Dyfi Estuary Mudflats are mudflats on the estuary of the River Dyfi in Ceredigion, Wales, and are part of the Dyfi National Nature Reserve. The Dyfi Estuary is located on the conjunction of the counties of Ceredigion, Gwynedd and Powys. The area is designated a Special Protection Area (SPA), a protected site for wild birds under the EC Birds Directive. The area comprises the estuary and adjoining salt marsh and includes sandbanks, mudflats, peat bogs, river channels, meanders and creeks, with an extensive sand dune complex across the mouth of the estuary at Ynyslas. A large part