The River Wad drains surface water run-off from a, primarily urban, catchment of about 500 hectares in North Dublin. The catchment has experienced significant flooding at several locations, notably at Donnycarney, after extreme rainfall events in August 2008 and July 2009.

A 2D hydraulic model of the river system was built using InfoWorks CS software with available data from drainage records and LiDAR topographical surveys. These data were confirmed and augmented by detailed GPS and asset surveys within critical areas of the catchment. The hydraulic model was verified using the rainfall data and flood records of 2008 and 2009.

A tidal regression analysis was also carried out to design the outfall location for the storm culvert into Dublin Bay. A cost-benefit analysis was run on several options to determine the optimum solution to reduce the impact of flooding in the area.

As a result, a flood attenuation scheme using nature-based solutions were adopted. A diversion channel and automated gate control was constructed to enable flooding into an area within Clontarf Golf Club.