Adaptive-network- based fuzzy inference systems 1 Cascaded-ANFIS Catchments 1 Climate change 1 Climate models 1 Error rate 1 Errors 1 Forecasting 1 Fuzzy inference 1 Fuzzy neural networks 1 Fuzzy systems 1 GRU 1 Hydroelectric power 1 Hydroelectric power plants 1 Hydropower 1 LSTM 1 Long short-term memory 1 Power- generations 1 RNN 1 Rain 1 Regression 1 Regression analysis 1 Regression modelling 1 Regression problem 1 Sri Lanka 1