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Mandatory Credit: Photo by John Connor Press Assocs Ltd/REX (3705128g) Dredger spraying sand and gravel sucked from seabed back onto the beach Dredger used to return lost sand to Eastbourne beach, East Sussex, Britain - 15 Apr 2014 As a result of the winter storms the Environment Agency and local authorities are resorting to topping up beaches to ensure an extra buffer from the kind of waves that rocked the county's beaches in January. The work by Pevensey Coastal Defence Ltd on Eastbourne beach sees layers of sand and gravel sucked from the seabed by the dredger Sospan Dau and delivered to the beach over high tide. The dredger comes very close to the beach and discharges a mixture of sediment and water using a technique known as rainbowing, which creates a mound of material high on the shore.