The flexible and modular nature of RapidBlocs allows a simple additional wedge to be moulded and then slotted into position against a regularly graded trapezoidal channel side. The advantages of the system are:

• The groyne is easily movable / adjustable in position by hand
• The groyne height is variable allowing safer views upstream and improved camera views both upstream and downstream
• Fully integrated into the full RapidBlocs system
• Groyne infill is fully restrained by a locating tongue and a RapidBloc lid to the adjacent RapidBloc.

These are available on request for a specific course geometry.