1. Coffer dams were sunk and forms constructed inside them while constant pumping occurred.2. On 12 November 2010, the construction reached coffer dam river closure. 3. There should be enough time to build the two coffer dams to required heights, 4. Between them and the hull were compartments filled with cork and containing a coffer dam . 5. That's one reason why the coffer dam was employed. 6. To enclose the construction site, the coffer dam was built ( The Hennepin Canal ). 7. Before Marmot Dam could be removed, a temporary coffer dam had to be built upstream. 8. The existing dam was used as a coffer dam while workers poured concrete for the new dam. 9. Nyaminyami had struck again, destroying the coffer dam , the access bridge and parts of the main wall. 10. In the first phase a leak-proof coffer dam was constructed to isolate and dry the work area.
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