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 2006: Germany spent the longest below LDC, 5 % 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.

5%15%

3%12%

2006Meanbelow LDC in season

Irrigation season (April–September) 2006
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	84	5%	-10 pp
Austria	1,647	0	0%	-1 pp
Slovakia	549	0	0%	-3 pp
Hungary	3,289	0	0%	-2 pp
Croatia	915	0	0%	-1 pp
Serbia	2,196	71	3%	-9 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
Banatska Palanka	Serbia	2006-10-02	2006-10-28	27
Passau Donau	Germany	2006-01-23	2006-02-16	25
Achleiten	Austria	2006-01-25	2006-02-16	23
Banatska Palanka	Serbia	2006-07-21	2006-08-12	23
Banatska Palanka	Serbia	2006-09-10	2006-09-28	19
Oryahovo	Bulgaria	2006-10-22	2006-11-08	18
Veliko Gradište	Serbia	2006-02-03	2006-02-18	16
Nagymaros	Hungary	2006-10-16	2006-10-31	16
Vác	Hungary	2006-10-16	2006-10-31	16
Szob	Hungary	2006-10-18	2006-10-31	14

The daily series uses the first reading of each day.