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


Hydrological situation for September 2022.

Figure 1. Exceedance of lowest discharge threshold level for September 2022.
Figure 1. Exceedance of lowest discharge threshold level for September 2022.
Figure 2. Exceedance of lowest water level threshold level for September 2022.
Figure 2. Exceedance of lowest water level threshold level for September 2022.
Figure 3. Classification of stations according to discharge historical data average percentile ranges for September 2022.
Figure 3. Classification of stations according to discharge historical data average percentile ranges for September 2022.

by EFAS Hydrological Data Collection Centre

During the month of September, there were 89 stations with exceedances, the majority of which are in Slovenia (29) and in Italy (20). In  Slovenia, the exceedances are related to the water level threshold and discharge threshold. The Danube river basin has the most exceedances, with 23 stations, and six stations are located in the Soca-Lsonzo river basin. In Italy, all exceedances are related to the water level threshold, and stations are centered on the west-north and center of the country, with the Po river having the highest number of stations (15), followed by the Tiber river basin with only three stations.

In addition, there are 15 stations in Croatia (along the Danube river) and 14 stations with exceedance in Spain (the Llobregat river stands out). Norway shows six stations with exceedance, the only country in the Scandinavian Peninsula this month, and the rest of the countries with exceedance only show one each.

As for the river basins, the main one with values above the threshold is the Danube, with 38 stations in four countries. It also highlights the aforementioned Po basin in Italy.

In terms of the stations that recorded values above the 90% quantile, 60 exceeded this threshold in September. For yet another month, Spain is the country with the highest number of stations (19). In the south of the Iberian Peninsula, the Guadalhorce, the Guadalquivir and the Guadiaro are the basins with stations recording values above the 90% quantile, and in the eastern area the Jucar stands out with seven stations. In Romania, there are eight stations that exceed this cliff, while in Ukraine, Slovenia, and Serbia there are five stations.

Other stations exceeded the 90% quantile value in Croatia, France, Hungary, Italy, and Norway on more than one occasion.

By river basin, the Danube river again stands out with 25 stations, with exceedances along eight countries, with Romania having the highest number of stations.  The sum of 24 different river basins shows exceedance over the 90% quantile.

Finally, and according to the number of stations recording average values below the 10% quantile, the trend has become more marked and we can find a decrease of around 65%. In the month of September, there are 114 stations with average values below this cliff, which implies 18 different countries.

This month, France is the country with the most stations (32), followed by Spain (19). Germany has ten stations below this threshold, followed by Sweden and Norway with eight stations each. 
In terms of basins, it is again the Danube river the one with the highest number of stations (21), with an average discharge below the 10% quantile, mainly in Austria, Germany, and Hungary. The Loire river basin in France has 13 stations in the same situation. In total, as many as 45 different basins have values below this limit.