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 2025: Bulgaria spent the longest below LDC, 46 % 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.

34%14%

1%1%

7%2%

11%2%

7%1%

23%11%

42%11%

46%5%

2025Meanbelow LDC in season

Irrigation season (April–September) 2025
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	557	34%	+20 pp
Austria	883	8	1%	0 pp
Slovakia	549	38	7%	+5 pp
Hungary	3,476	372	11%	+9 pp
Croatia	915	63	7%	+6 pp
Serbia	2,196	502	23%	+12 pp
Romania	2,379	990	42%	+31 pp
Bulgaria	1,098	505	46%	+41 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
Silistra	Bulgaria	2025-08-19	2025-11-07	81
Oltenița	Romania	2025-08-19	2025-11-06	80
Tulcea	Romania	2025-08-21	2025-11-07	79
Calafat	Romania	2025-08-16	2025-11-01	78
Oryahovo	Bulgaria	2025-08-17	2025-11-02	78
Ruse	Bulgaria	2025-08-19	2025-11-04	78
Isaccea	Romania	2025-08-22	2025-11-07	78
Lom	Bulgaria	2025-08-17	2025-11-01	77
Novo Selo	Bulgaria	2025-08-16	2025-10-16	62
Corabia	Romania	2025-08-18	2025-10-18	62

The daily series uses the first reading of each day.