本研究將針對蘭陽溪流域建置一智慧型之河川防災預警系統，預警系統可預報至少未來三小時之水位以作為決策支援。洪水預報的模式以具人工智慧(AI)之類神經網路(Artificial Neural Network)為主，配合水利署水文觀測現代化多工多埠傳輸系統，取得各水文站即時傳回之資料，並加強自動化減少人工輸入使智慧型系統即時預測的能力更加穩健。透過網際網路以Web型式展示即時觀測值及洪水預報功能，達成水文資訊之即時化，以擴大水文資訊之範疇與提昇服務的品質與精確度。研究中分別利用ANFIS 網路模式推估未來一至三小時之河川水位，研究成果顯示，於蘭陽溪流域上游牛鬥橋水位站水文資料有限，使得網路無法得到適度的資訊用來訓練，故效果未如預期；反觀下游蘭陽大橋水位站，其1~3小時的預報則有高度的精確性。 In this study, the artificial neural networks (ANNs) is used to modelthe multistep ahead rainfall-runoff processes and implemented inLan-yang watershed. For the practicable purpose, the forecasting modeland the coming data are integrated to provide the flood informationfor the decision-maker through on-line facility, such as internet orintranet. In this project, the one-, two-, and three-hour-ahead waterlevels of Lan-yang river basins are forecasted by utilizing ANFISnetwork. The performances can be concluded as follows. In Lan-yangriver basin, due to the limited data in the upstream for training thenetwork, the results are not as agood as expected, while the resultsof one to three hour ahead predictions in downstream Lan-yang gaugestation, which has enough data for training, are highly accuracy.