The diversion ratios of flow and sediment in the Pearl River Delta have changed significantly since 1993. At Sanshui station, the diversion ratios increased abruptly, with flow exceeding 25% and sediment reaching 16%. An artificial neural network model was used to predict these ratios, showing a flow diversion of over 25% from 1998 to 2000, and sediment diversion of 12% in 1998, 15% in 1999, and 16% in 2000.