EN
Lag time of runoff – Lag is one of the characteristic values in rainfall-runoff modeling and lag time of sediment yield – LagS is an important characteristic in the procedure of predicting the suspended sediment rate (sedimentgraph). The relationship between the lag times (LagS/Lag) is used for estimating sediment routing coefficient – B, which is a key parameter of the instantaneous unit sedimentgraph (IUSG). The IUSG formula is needed to transform the sediment produced during rainfall into sedimentgraph. The relationship LagS/Lag was examined for a three small basins (two of which are located in Poland, and one in Germany). The ratio LagS/Lag, estimated for events from the investigated basins, has been in the range from 0.49 to 1.11. A statistical significant correlation has been found between the value of LagS/Lag and rainfall depth in one of the basins.