Dubbo has experienced a number of overland flooding problems at several locations within the city. Council had formulated possible augmentation works to address the problems and was keen to confirm that the proposed works would address the local flooding problems. The drainage system in Dubbo faces a number of challenges due to the relatively flat grades on stormwater drainage lines and the possibility that overland flows from a local drainage catchment may flow into an adjacent catchment via the road system. It has also been found that minor works like a roundabout can also initiate flooding of local properties.
Council had previously commenced the assembly of XP-SWMM model(s) of some of its drainage systems. Council also had available Aerial Laser Scanning (ALS) of the city.
Modelling overland flows and drainage augmentations in Dubbo - Case Study