Abstract
The sensitivity of the output to the parameter values of a hybrid model (HEC-1 model) with one stochastic component added is considered in the context of the Bolivian highlands. Firstorder and Monte Carlo analysis techniques were used to establish the influence of each parameter in the model. The greatest contribution to uncertainty in the model estimation corresponds to the initial loss (IL) and the uniform loss (CL) parameters. However, it is important to recognize that large variation in output may also be caused by differences in the spatial distribution of precipitation (a low-density network). Other parameters of the model structure ( TC) and ( S R) and the parameters defining the concentration of flow had less effect. If it were possible to estimate the net rainfall with greater precision the concentration parameters could easily be adjusted to meet the requirements of accurate representation of peak flows.
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