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 2016: Serbia 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.

2016Meanbelow LDC in season

Irrigation season (April–September) 2016
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	46	3%	-12 pp
Austria	1,647	0	0%	-1 pp
Slovakia	548	3	1%	-1 pp
Hungary	3,474	2	0%	-2 pp
Croatia	915	0	0%	-1 pp
Serbia	2,196	63	3%	-9 pp
Romania	2,379	0	0%	-13 pp
Bulgaria	1,098	3	0%	-5 pp
Ukraine	549	0	0%	-10 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
Achleiten	Austria	2016-12-16	2017-01-31	47
Oberndorf	Germany	2016-12-11	2017-01-13	34
Passau Donau	Germany	2016-12-23	2017-01-14	23
Veliko Gradište	Serbia	2016-12-24	2017-01-14	22
Oberndorf	Germany	2016-09-30	2016-10-19	20
Banatska Palanka	Serbia	2016-12-28	2017-01-16	20
Deggendorf	Germany	2016-12-29	2017-01-13	16
Galați	Romania	2016-01-01	2016-01-14	14
Brăila	Romania	2016-01-02	2016-01-14	13
Banatska Palanka	Serbia	2016-10-01	2016-10-13	13

The daily series uses the first reading of each day.