The water is too shallow for the use of a hold suction dredge.
Shallow water increases the quantities when using a cutterhead suction dredger because the trench must be wider, making the equipment choice uneconomical. However, it also depends on the type of soil. Therefore, in cases where the cutter suction dredger can achieve high production, it can be a cheaper alternative, even though it dredges more material
The soil may be too hard / stiff for excavation by trailer suction hopper dredger.
Rock lumps above a certain size cannot be dredged with cutterhead suction dredgers due to the cutting edge (opening size between the blades), the same applies to TSHD due to the opening between the blades of the pump impeller or the grid installed in the suction head. This can be affected by blasting within a smaller grid, resulting in smaller rock chunks (but more expensive). Rock lumps can best be dredged with a BHD.
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