Clearly the FoS returned for critical load cases adjacent to the IB are not sufficient.
The stabilizing berms must be built to achieve the required FoS’s.
Of course I wasn’t present at any site meetings, but;
· Working space is a small inconvenience when compared to dam failure…
· Any crane position foundations (are there any?) can be buried as they were for the stage 1 cofferdams
· And as Giuseppe points out temporary blocking of the exit chutes is not a big issue, as it will be excavated out later
Our mandate is to design safe cofferdams. Operational problems/solutions belong to CHK.