This paper develops a novel multilayer neural networks based on adaptive streamflow forecast technique for complicated nonlinear water systems, and the forecast mechanism using multilayer neural networks is analyized.

Optimal operation of reservoir is the main artifice in realizing water resource optimal dispose, which including internal optimal operation of hydropower station and its foundation that runoff forecasting and reservoir water optimal dispose.

The nonlinear model of runoff forecast based on wavelet decomposition;

The chaotic neural network model of runoff forecast based on wavelet de-noising;

Changing rule of the runoff in the dry season and the monthly runoff forecast in Qianhe River Basin;