Pewet Island (Bradwell Marina)

Year Implemented

1995

Project Type

Beneficial use of dredged sediment

Country

United Kingdom

Location

Blackwater Estuary (Essex)

Longitude

0.8783

Latitude

51.7315

Habitat(s) Created
Size

Why Undertaken
  • Economic Need/Enhacement

  • Habitat Enhancement

Project Description Summary

At Pewit Island sand/shingle was placed using material from Harwich which was 'rainbowed' onto the site via the Sospan Trailing suction hopper dredger. This eased the rapid erosion and provided a very successful nesting site for little tern (60 pairs in year 1). This pumped Harwich shingle was after year 1 backed with a brushwood fence to ease migration of that material onto the salting. The shingle washed against it, raised itself to HAT and stabilised (the same method was used on the shingle recharge on Cob Marsh and Old Hall Point). In 1992 and 1995, a total of 2,529m3 & 2,646m3 respectively of dredged fine muddy sediment was pumped on site. No retaining devices were used as the sediment is allowed to dissipate. The sediment is generally placed on the western point of the island. The more regular silt sediment recharge work is done by pumping marina dredgings through a pipe from Bradwell. The silts are pumped onto the top of the salting and formed a stable marsh out of what was an eroding system. This work is ongoing.

Documents/References uploaded


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