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
South Shore Estuary South Shore Estuary The South Shore Estuary is an estuary located along the south shore of Long Island, between the mainland and the outer barrier islands, in eastern New York state. It stretches for over from West Bay in Nassau County to the Shinnecock Bay in Suffolk County. The South Shore Estuary includes a series of interconnected bays, rivers, streams, wetlands and small islands located along Long Island's south shore between the mainland and the barrier islands. Reynolds Channel, West Bay, Middle Bay, East Bay, South Oyster Bay, Great South Bay, Patchogue Bay, Moriches Bay and Shinnecock Bay are part