Ecological and hydrological functions of the biggest natural floodplain in Latvia

The biggest natural floodplain in Latvia is located within the Daugava valley stretch from Daugavpils City down to Jersika, where the river cuts through the Baltic Morainic Ridge and in its further course flows across the Eastern Latvian lowland. The territory of the floodplain which is outlined by the highest spring flood level encompasses 208.25 km2. This territory reduces the risk of severe flooding further downstream by accumulating a significant proportion of the Daugava maximal runoff, reducing the magnitude of the flood pulse by 3–4 meters. In addition, the floodplain accumulates a large amount of suspended and dissolved matter, which, in turn, stimulates productivity of floodplain meadows, wetlands and lakes. The NATURA 2000 site is also located in this floodplain.