“…Recently, many researchers have successfully applied ANN models in hydrologic modelling, such as typhoon rainfall forecasting (Lin and Chen, 2005), the determination of aquifer parameters (Samani et al, 2007), and regional ground water levels simulation (Coppola et al, 2003a(Coppola et al, ,b, 2005Feng et al, 2008). A number of studies combine the optimization model with ANN (Rogers and Dowla, 1994;Rogers et al, 1995;Johnson and Rogers, 2001;Rao et al, 2003Rao et al, , 2005. Rogers and Dowla (1994) used ANN-GA methodology to replace 2766 H.-J.…”