Derivation of Design Rainfall Temporal Patterns for the Gold Coast Region: 96 Hours and 120 Hours Durations

Temporal pattern is considered to be one of the most critical variables in design flood estimation which show a wide variability from storm to storm i.e. with respect to time and space. Australian Rainfall and Runoff (ARR) 1987 states that design flood estimates can show as large as 250% variation with two different temporal patterns from the observed rainfall events. Temporal pattern is one of the key design parameters that can have a major impact on the design of hydraulic and water control structures, e.g., weirs, dams, local government infrastructure networks i.e. major and minor drainage systems, stormwater management systems. Changes or variations in temporal patterns can significantly impact on the cost of the infrastructure as well as the associated risk of failure due to under-design of infrastructures. This study is aimed to obtain design rainfall temporal patterns of longer duration storms in the Gold Coast region.