An alternative IUH for the hydrological lumped models

An alternative IUH for the Muskingum model as well as for the linear reservoir is presented. It is shown that the IUH of the Muskingum model can take the form of the IUH for the diffusive wave model. This approach is based on the equivalence of the results given by both models. The instantaneous unit hydrograph obtained in this way has better properties comparing with the classical ones. It is able to reproduce simultaneously a translation of the flood wave along a channel reach and its attenuation. It does not produce any negative discharges at the downstream end of the channel reach as well.