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 1998: Austria spent the longest below LDC, 3 % 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.

3%1%

2%5%

1998Meanbelow LDC in season

Irrigation season (April–September) 1998
countries	station-days in season	below LDC in season	%	vs. average
Austria	1,647	53	3%	+2 pp
Hungary	3,472	3	0%	-2 pp
Croatia	395	0	0%	-1 pp
Bulgaria	1,098	17	2%	-3 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
Wildungsmauer	Austria	1998-08-08	1998-08-23	16
Wildungsmauer	Austria	1998-05-24	1998-06-04	12
Gönyű	Hungary	1998-02-02	1998-02-12	11
Wildungsmauer	Austria	1998-12-26	1999-01-05	11
Wildungsmauer	Austria	1998-08-27	1998-09-05	10
Wildungsmauer	Austria	1998-12-04	1998-12-13	10
Wildungsmauer	Austria	1998-04-20	1998-04-27	8
Achleiten	Austria	1998-02-07	1998-02-13	7
Szob	Hungary	1998-02-08	1998-02-14	7
Nagybajcs	Hungary	1998-02-07	1998-02-12	6

The daily series uses the first reading of each day.