Statistics

Statistics by country and year

Yearly summaries computed from the daily readings of every station: how many station-days were spent below the low-water level (LDC) or above the high-water level (HDC) — as a count and as a share of the station-days with thresholds. Useful for agriculture (irrigation seasons with low water) and navigation (days with restricted draught).

Agriculture: station-days below LDC mark the low-water periods when irrigation intakes and water availability are under pressure.
Navigation: days below LDC mean draught restrictions on that sector; days above HDC mean suspended traffic.

Daily data from 1879 to 6 November 2026

Download this tab’s data (CSV)

LDC: Low-water mark. The river stays above it on 94 of 100 ice-free days; below it, ships cannot sail fully loaded.
HDC: High-water mark. The river exceeds it on 1 day in 100; above it, navigation can be suspended.
Station-days: One station-day is one station measured for one day: 13 stations over 10 days make 130 station-days. It shows how widely and how long something lasted.

Irrigation season 2017: Bulgaria spent the longest below LDC, 10 % of days

Irrigation season (April–September)

Station-days below LDC in the irrigation season, by country and year, against the average of the other years; the longest uninterrupted spells below LDC.

2017Meanbelow LDC in season

Irrigation season (April–September) 2017
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	140	9%	-6 pp
Austria	1,647	0	0%	-1 pp
Slovakia	549	0	0%	-3 pp
Hungary	3,322	0	0%	-2 pp
Croatia	915	0	0%	-1 pp
Serbia	2,196	144	7%	-4 pp
Romania	2,376	142	6%	-7 pp
Bulgaria	1,098	108	10%	+5 pp
Ukraine	549	40	7%	-2 pp

Longest spells below LDC

Uninterrupted periods of at least 5 days below LDC, by station.

Longest spells below LDC
Station	countries	From	To	days
Medveďov	Slovakia	2017-01-01	2017-02-02	33
Paks	Hungary	2017-01-04	2017-02-04	32
Novo Selo	Bulgaria	2017-01-02	2017-01-20	19
Bechet	Romania	2017-01-03	2017-01-20	18
Nagybajcs	Hungary	2017-01-16	2017-02-01	17
Passau Donau	Germany	2017-01-16	2017-02-01	17
Wildungsmauer	Austria	2017-01-16	2017-02-01	17
Bechet	Romania	2017-07-16	2017-08-01	17
Svishtov	Bulgaria	2017-01-05	2017-01-20	16
Szob	Hungary	2017-01-18	2017-02-02	16

The daily series uses the first reading of each day.