The catchment is represented in the horizontal plane by rectanqular grid squares. The main channel and the tributaries of different orders are represented by the boundaries of grid squares. The organization of the interaction between components of the hydrological modelling system allows to take feedback into account. Coupling of the calculations of the vertical moisture transport with the overland and groundwater flow is accomplished by means of a special procedure. Modeling Soil Erosion and Sediment Transport in the River Basin A soil erosion and sediment transport model was developed as a separate block of the hydrological modelling system.
Sediment routing in channels is described by the one-dimensional sediment continuity equation.
Numerical integration of these equations are carried out an implicit finite difference scheme. To test the soil erosion block in the hydrological modelling system the observation data of the water regime and the sediment flow for the Studeniy River basin located in area of Transcarpatian water balance station were used. The lengths of the reaches of the channel network, the slopes of the river bed and the catchment surface were determined from a topographic map. The lenghts of the reaches of the channel network, the slopes of the river bed and the catchment surface were determined from a topographic map. The horisontal permeability coefficient was determined by matching the values of the observed base flow with these calculated and was taken equal to 0.6 m day-1.