Webb McKeown have completed the Terrigal and Wamberal Lagoons Flood Studies to Draft Report stage. Avoca and Cockrone Lagoons Flood Studies undertaken by Paterson Consultants have also been completed to Draft Report stage. The two sets of studies have used different approaches to key elements of the study:

• Terrigal/Wamberal Lagoon used WBNM Hydrologic Model, RUBICON Hydraulic Model, and Ackers and White Scouring Routine Opening Procedure.
• Avoca/ Cockrone Lagoon used ROBB Hydrologic Model, Mike-II Hydraulic Model, and Mike-I I Dambreak Opening Procedure.