Large diameter cellular cofferdams can be repaired using specially curved dams . For projects where a short in-fill wall section connects between the main circular dams, two dams (‘belly’ and ‘cleavage') may be used to cope with the wall profile and the connecting geometry.

The cofferdams may be made of Frodingham straight web sheet pile section. This or other sections can be accommodated by the seal system.

Also see Leith case history for more information.