The Nida River flows trough the southern part of Poland. The basin of this river is localized mainly in Swietokrzyskie province. It is a longest river in this province (151.2 km) flowing in it's upper part trough the southern part of the Swietokrzyskie Mountains. In most part Nida is a not regulated lowland river, characterized by the slope of about 0.65 promiles. The Nida River valley between cross-sections Stara Wies and Pinczow had been strongly transtormed. Between villages Stara Wies and Motkowice, the typical river training had been done. The river also was partially trainned on the distance between Motkowice and Pińczów as well as in the short distance below Pinczow. The Nida River embankments are localized in the middle part so a big part of the river valley cannot be used as a small retenition. These narrowly distributed fortiffications are in a weak condition, what causes that spring flood waves which often reach the top of the embankments can easily destroy the embankments and flush onto the valley some of their parts together with the sandy substratum from below. The water flowing trough the destroyed part of the embankment transports the high volume of sand from the riverbed which, ...
