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 2005: Germany spent the longest below LDC, 1 % 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.

1%15%

12%

13%

2005Meanbelow LDC in season

Irrigation season (April–September) 2005
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	21	1%	-14 pp
Austria	1,647	0	0%	-1 pp
Slovakia	549	2	0%	-3 pp
Hungary	3,293	0	0%	-2 pp
Croatia	915	0	0%	-1 pp
Serbia	2,007	9	0%	-12 pp
Romania	1,464	0	0%	-13 pp
Bulgaria	1,098	0	0%	-5 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
Szob	Hungary	2005-10-27	2005-12-06	41
Komárom	Hungary	2005-10-27	2005-12-06	41
Passau Donau	Germany	2005-11-05	2005-12-06	32
Esztergom	Hungary	2005-10-30	2005-11-29	31
Vác	Hungary	2005-10-31	2005-11-27	28
Nagymaros	Hungary	2005-10-31	2005-11-26	27
Paks	Hungary	2005-11-03	2005-11-27	25
Wildungsmauer	Austria	2005-11-05	2005-11-22	18
Oberndorf	Germany	2005-11-13	2005-11-27	15
Baja	Hungary	2005-11-15	2005-11-27	13

The daily series uses the first reading of each day.