Conceptual catchment water balance model

A water balance model aimed at quantifying catchment water storage, runoff and actual evapotranspiration is considered in the paper. A concept of two connected reservoirs is adopted and the corresponding equations for upper and lower reservoirs are successively solved. The computer system based on the model consists of two main independent parts. The first one CLIRUN 4s simulates water balance components on a basis of historical values of catchment precipitation and potential evapotranspiration. In the second part CLIRUN 4g the input climatic data are obtained by means of stochastic generation procedures. In the paper exemplary results for a selected catchment are presented to reveal a better model performance in comparison with its former simpler versions.