The construction of a Dam involves the need for hydraulic sealing treatments both below the same dam or its abutments. Together with the experience as for the specific techniques to be used, the site organisation and the technicians' experience becomes here much more important than in other fields because of the rapids and effective solutions to be often found under not favourable conditions.

Consolidation works require drilling & grouting applications or plastic cut off walls executed with the diaphragm walls or jet grouting techniques. Important dam projects in Nigeria like Suleja, Jibiya(Katsina), Kainji, Pedan (Abuja),Jebba, Tunga (Mambilla) and many others have seen Trevi operate with its teams for the consolidation works over many years.