Newcastle City Council commissioned Royal HaskoningDHV to develop a detailed design for the redevelopment of Merewether Ocean Baths. Integrated within the bath’s infrastructure is a stormwater system, comprising a stormwater culvert and outfall, discharging stormwater flow from an urban catchment. The outfall frequently blocks due to build-up of course beach material and during high rainfall events can cause blockage, leading to surcharged flow spilling into the baths. The stormwater system is to be physically reconfigured as part of the redevelopment. 

Newcastle City Council requested that stormwater modelling is undertaken to understand the existing quality of stormwater and inform decisions on physical stormwater drainage reconfiguration as well as the incorporation of upstream stormwater treatment measures.

 MUSIC (Model for Urban Stormwater Improvement Conceptualisation) modelling software was used to model the stormwater quality and quantity, and test the effectiveness of stormwater treatment measures. The urban catchment was represented schematically by a number of source and treatment nodes, reconfigured to incorporate and assess proposed treatment measures.

The effectiveness of various stormwater treatment measures was tested and the outcome used to make informed decisions on the most effective type and combination of treatment measures.