Rapid land developed is occurring in Lyndhurst in response to significant demand for new housing and industrial land. Water Technology investigated opportunities to optimise the footprint of retarding basins and wetlands. Due to the high cost of industrial land acquisition, footprint area was critical. Water Technology used a linked 1-d and 2-d model to optimise the design of a significant retarding basin for Melbourne Water. When compared to the initial hydrological (RORB) modelling, the results showed a significant reduction in the required basin footprint. The reduction in retarding basin footprint size resulted in significant cost savings to Melbourne Water due to the reduction in expensive industrial land required.
Since the completion of this study, Water Technology has assisted many developers in the area to work through detailed designs of channel crossings and basin construction, as well as the setting of appropriate floor levels to prevent flood damage and reduce flood risk. Extreme events such as the 500 and 1,000 year ARI events were also tested in the hydraulic model to test the performance of the basin in these conditions.