Monthly maps for discharge anomalies and Lowest alert level exceedance with a summary of the monthly hydrological situation.


Hydrological situation for September 2019

Figure 1. Exceedance of lowest threshold levels for discharge.
Figure 1. Exceedance of lowest threshold levels for discharge.
Figure 2. Exceedance of lowest threshold levels for water level.
Figure 2. Exceedance of lowest threshold levels for water level.
Figure 3. Monthly classification for discharge according to historical data average percentiles.
Figure 3. Monthly classification for discharge according to historical data average percentiles.

For September, the highest concentration of stations that exceeded their lowest threshold level was located in Norway, and the Po river basin in Northern Italy. In the rest of Europe, exceedances ocurred in isolated stations in the Danube river basin, the Oder river basin in northern Poland, the Hiyon river basin in Israel and Minho-Sil river basin in north-western Spain. Special mention should be made of several stations in the Mediterranean river basins in south-eastern Spain (Almanzora, Andarax and Guadalhorce), where mayor exceedances occurred due to the so-called “cold drop” meteorological phenomenon which caused severe flash floods and floods in the area.

Stations that registered discharge values above the 90% quantile are mostly located in England and south-eastern Norway. In the rest of Europe, just only isolated stations fullfil this condition: Guadalquivir river basin in southern Spain, Rhine river basin in Germany, Danube river basin in Austria, Ythan river in Scotland and Moy river in Ireland.

Stations registering values below the 10% quantile were mainly in Germany (the Elbe and Rhine river basins), Poland (Oder and Vistula river basins) and Eastern Danube river basin A lower concentration of stations is found in Dnieper and Dniester river basins in Ukraine, Ebro river basin in Spain, Scheldt and Meuse river basins in Belgium, Rhine river basin in Switzerland and basins in south-eastern Sweden. Finally, Maritsa river basin in Bulgary, Thames river basin in England and Glomma river basin in Norway just have one station with this condition.