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 2020: Germany spent the longest below LDC, 25 % 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.

2020Meanbelow LDC in season

Irrigation season (April–September) 2020
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	415	25%	+11 pp
Austria	1,647	0	0%	-1 pp
Slovakia	549	4	1%	-1 pp
Hungary	3,656	11	0%	-2 pp
Croatia	915	0	0%	-1 pp
Serbia	2,156	131	6%	-5 pp
Romania	2,379	34	1%	-12 pp
Bulgaria	1,098	37	3%	-2 pp
Ukraine	549	10	2%	-7 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
Oberndorf	Germany	2020-11-18	2020-12-14	27
Veliko Gradište	Serbia	2020-01-07	2020-02-01	26
Achleiten	Austria	2020-12-30	2021-01-24	26
Wildungsmauer	Austria	2020-12-31	2021-01-23	24
Pfelling	Germany	2020-11-23	2020-12-14	22
Medveďov	Slovakia	2020-01-12	2020-02-01	21
Regensburg Eiserne Brücke	Germany	2020-11-15	2020-12-02	18
Veliko Gradište	Serbia	2020-04-03	2020-04-19	17
Veliko Gradište	Serbia	2020-04-21	2020-05-06	16
Oberndorf	Germany	2020-09-10	2020-09-25	16

The daily series uses the first reading of each day.