Computerised Design Rainfall Information System for Australia

Development of an automated design rainfall system is discussed in this paper. The design rainfall information is discussed in terms of intensity-frequency-duration (IFD) curves. The system is termed CDIRS (Computerised Design IFD Rainfall System) and was developed initially to assist in design rainfall procedures for Australia and statistical design flood methods based on these design rainfalls. In developing CDIRS account was also taken of its further application to enable efficient and consistent handling of client requests for design IFD rainfalls. It allows rapid access to IFD information and is especially useful where variation of design rainfalls is required across large areas or for numerous locations.