In this study, an artificial neural networks (ANN) was used to optimise the results obtained from a hydrodynamic model of river flow was evaluated. The study area is Reynolds Creek Experimental Watershed in southwest Idaho, USA. A hydrodynamic model was constructed to predict flow at the outlet using time series data from upstream gauging sites as boundary conditions. In the second stage, the model was replaced with an ANN model but with the sa me inputs. Finally a hybrid model was employed in which the error of the hydrodynamic model is predicted using an ANN model to optimise the outputs. Simulations were carried out for two different conditions (with and without data from a recently suspended gauging site) to evaluate the effect of this suspension in hydrodynamic, ANN and the combined model. Using ANN in this way, the error produced by the hydrodynamic model is predicted and thereby, the results of the model are improve

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