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


Hydrological situation for May 2022.

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

by EFAS Hydrological Data Collection Centre

During the month of May, there were 63 stations with exceedances. The majority of these stations are located in Italy (17) and in Spain (14). In Italy, where all exceedances are related to the water level threshold, the stations are centered in the Po river basin, with almost all of them. Garigliano and Tiber have one station each. On the other hand, exceedances in Spain are mainly due to discharges values. The Llobregat river basin has the most stations (6) and the Mijares basin has two stations.

In addition, there is a considerable concentration of stations in Ukraine, mainly in the Dnieper and, to a lesser extent, in the Danube basins. The Scandinavian peninsula (central and northern areas) has eleven stations, with six of them in Norway and five in Sweden. In addition, Austria, Poland, Serbia, and Georgia present more than one station with exceedances.

As for the river basins, the two main river basins with station values above the threshold are, as in the previous month, the Po (15) and the Danube (9). The exceedances in the Danube basin are spread over six different countries.

Regarding the stations that recorded values above the 90% quantile, 34 exceeded this threshold in May. Again, this month, Spain is the country with the highest number of them. The Spanish basins have 23 stations, with the Júcar river the basin with the highest number of stations (9). Even in the east, in the south of the Iberian Peninsula we can find the Guadalhorce and Guadalquivir basins. Ukraine has four stations, followed by Italy with three stations exceeding this quantile.

Categorizing by basins, in addition to the Júcar basin, the Dnieper river basin stands out with four stations. 

In addition, other stations exceeded the 90% quantile value in Italy, Germany, Austria, United Kingdom, and Luxembourg.

Finally, and according to the number of stations that register average values below the 10% quantile, the trend changes and we find an increase of 130%. In the month of May, there are 139 stations with mean values below this threshold. 

France is the country with the most stations (31), followed by Spain, which doubled since the previous month by recording 20 stations in May. Norway recorded a similar number of stations (17) and Germany produced 15 stations. Poland and Ukraine have ten stations each and nine stations can be found in Italy.

In terms of basins, the Loire river in France is the one with the highest number of stations (21). The Danube and Oder river basins present 13 and 12 stations with values below the 10% quantile. All in all, up to 40 different basins present values below this limit.