Hydrological situation for March 2023
by EFAS Hydrological Data Collection Centre
During the month of March, there were 114 stations with exceedances, which is 17% less when compared to the previous month. Most of the exceedance stations are in Bosnia and Herzegovina (16), with most of them being related to water level. In Poland, there are 15 stations with exceedances (water level), and 14 stations in Germany. Croatia and Italy also stand out with exceedances in 11 stations each.
In addition, there are nine stations in Hungary, eight in Ukraine, seven in Spain, and five in Romania. Several countries have less than five exceedances this month: Serbia and Slovenia (4), Slovakia (3), Czech Republic, Belgium, and Ireland (2), and only one station with values above the threshold in Iceland.
As for the river basins, the main one with exceedance values above the threshold is again the Danube, with 54 stations across ten different countries, with Bosnia and Herzegovina (14) and Croatia (10) standing out. The Vistula river in Poland is the next basin with the highest number of stations (11) with one additional station in Ukraine. A total of 23 different river basins have exceedances in March.
In terms of the stations that recorded values of mean discharge above the 90% quantile, 47 exceeded this threshold in March, which is 60% less than in the previous month. In March, Norway was again the country with the most stations in this situation (12), half than in February. Spain and Ukraine with 6 each, are the countries with the next highest number of stations. The Norwegian stations are distributed across six different basins, highlighting the Glomma river, with five stations in this situation. In Spain, the Guadiana river basin has the highest number of exceedance in the country, and in Ukraine all stations are in the Dnieper river Basin. In Bosnia and Herzegovina and Finland five stations show values above this quantile. In Germany there are three stations that exceed this cliff, and two in Iceland and England. Other stations exceed the 90% quantile value in up to six countries.
By river basin, it is the Danube River which stands out with seven stations. The Dnieper river basin is the second with the highest number of stations over this cliff, showing six stations in this situation and followed by Glomma with five. A total of 23 different river basins have exceedances over the 90% quantile in March.
Finally, and according to the number of stations recording mean values below the 10% quantile, we can find a decrease of three times. In the month of March, there were 53 stations with average values below this cliff, which means 12 different countries.
This month, Spain is the country with the most stations (19), followed by France with nine stations. Italy has five stations with values below this threshold. In Bulgaria and Germany, we find three stations each. Romania, England, Austria, Hungary, Norway, and Croatia also have a different number of stations in this situation.
In terms of river basin, this month the Danube and the Ebro are the rivers with the highest number of cases, with eight stations each with an average discharge below the 10% quantile. The Siene and Llobregat rivers have four stations in the same situation. In total, as many as twenty-four different basins have values below this limit.