Simple non-linear regression relationships between sediment transport on the one hand and water discharge, rainfall depth and rainfall intensity on the other hand were established for two basins located near Xanthi (Thrace, northeastern Greece): Kosynthos River basin with an area of about 237 km2 and Kimmeria Torrent basin with an area of about 35 km2. Measuring data of rainfall depth, rainfall duration, water discharge and sediment transport for the outlets of the above basins were available. The relatively high values of the correlation coefficients resulted from the regression analysis indicate that sediment yield at the outlet of the studied basins can be predicted satisfactorily as a function of the water discharge in the main streams of the basins on the one hand and the rainfall characteristics (rainfall depth, rainfall intensity) on the other hand.