The results indicate that along the tributaries of the Flöha very high local peak reductions can be achieved with small retarding basins. The efficiency of the basins is related to the available storage capacity in the valleys upstream of the settlements. On a supralocal level, i.e. at the Flöha River, an additional reduction of the peak discharge occurs in the model. Other significant supralocal effects can be observed for the scenarios with an increased floodplain roughness (afforestation). In a combination of both scenarios the supralocal effects increase further, whereas the local effects are as high as in the retarding basin scenario. By contrast, the river renaturation scenario does not show a significant impact on the flood hydrographs. However, the limited effect is a result of the local characteristics of the study area, where the number of suitable river sections is limited and the slope gradients are high.
On the whole, it can be concluded that decentralised measures along the rivers can be efficient elements in the framework of flood protection strategies. The reduction of flood peaks includes not only the receiving water, but also the tributaries, so that an improvement of flood protection extending across the entire watershed can be achieved.