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PAVLIK, V.: Eff ects of polders on the course of fl oods in the watershed of the Ticha Orlice river. Acta univ. agric. et silvic. Mendel. Brun., 2008, LVI, No. 4, pp. 135–142 Polders show an important water-management function in the fl ood-control protection of watersheds. The course of actual fl oods in recent decades and eff ects of the water works on fl ood fl ows have proved the suitability of the construction within integrated fl ood-control measures in particular watersheds of the Czech Republic. To determine the transformation eff ect of fl ood-control measures in watersheds mathematical modelling is an important method, which is used not only in the preparation and design of retention areas but also in dealing with the fl ood protection of towns and villages. Easy verifi cation of other measures in watersheds is also useful. Their implementation can be thus prepared for the future or it is possible to back off the intentions. In our case, a fact is advantageous that the model is opera ted in the workplace of the Elbe Basin water-management dispatching centre, which is compatible with assessed polders in the partial Elbe watershed, namely in the Ticha Orlice watershed and its partial Třebovka watershed. The polders assessed are situated on the Třebovka stream, which is the largest tributary of the Ticha Orlice river. These dry reservoirs and the increased protective function of the Hvězda pond aff ect runoff from about 80 km 2 . Within research activities, possibilities were studied to obtain necessary retention areas in existing small water reservoirs. It became evident that the only realis tic solution was to increase protective functions of the pond Hvězda. Its present total retention space of 1.4 million m 3 can be increased only by 0.35 million m 3 , however, in combination with the sophisticated lay-out of a new emergency spillway and outlet the whole retention space can be used much more eff ectively. To obtain other retention areas localities were found out in the whole upper watershed of the Třebovka stream, which fulfi lled requirements for placing the adequate capacity of polders. Subsequent modifi cations of the Třebovka channel in the most endangered villages and towns and their capacity design according to transformation eff ects of selected reservoirs and measures, determination of their eff ect and comparison with profi les on the Ticha Orlice are the content of the paper.

Effects of polders on the course of floods in the watershed of the Tichá Orlice river