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 2007: Bulgaria spent the longest below LDC, 14 % 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%

1%2%

9%11%

8%13%

14%5%

2007Meanbelow LDC in season

Irrigation season (April–September) 2007
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	76	5%	-10 pp
Austria	1,647	1	0%	-1 pp
Slovakia	546	0	0%	-3 pp
Hungary	3,471	32	1%	-1 pp
Croatia	915	0	0%	-1 pp
Serbia	2,191	194	9%	-2 pp
Romania	2,289	191	8%	-5 pp
Bulgaria	1,098	149	14%	+9 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
Oryahovo	Bulgaria	2007-07-28	2007-08-21	25
Corabia	Romania	2007-07-29	2007-08-21	24
Bechet	Romania	2007-07-29	2007-08-21	24
Banatska Palanka	Serbia	2007-08-20	2007-09-12	24
Óbuda	Hungary	2007-07-28	2007-08-12	16
Veliko Gradište	Serbia	2007-08-06	2007-08-21	16
Novo Selo	Bulgaria	2007-07-27	2007-08-09	14
Calafat	Romania	2007-07-28	2007-08-10	14
Pančevo	Serbia	2007-08-05	2007-08-17	13
Banatska Palanka	Serbia	2007-08-06	2007-08-18	13

The daily series uses the first reading of each day.