ABSTRACT
The objective of having freeboard is to provide assurance against overtopping resulting from wind set up and wave run up.
Other factors which may influence the selection of freeboard include:
– Reliability of design flood estimates. – Spillway gate reliability and the effect of a gate or gates failing to operate during
the flood. – Assumptions made in flood routing. – Potential changes in design flood estimates, either through changes in flood
estimation techniques or due to changed catchment conditions.
