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 2022: Bulgaria spent the longest below LDC, 44 % 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.

32%14%

2%1%

8%2%

15%2%

21%

29%10%

38%12%

44%5%

2022Meanbelow LDC in season

Irrigation season (April–September) 2022
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	519	32%	+18 pp
Austria	1,647	36	2%	+1 pp
Slovakia	549	43	8%	+6 pp
Hungary	3,660	552	15%	+13 pp
Croatia	915	195	21%	+21 pp
Serbia	2,196	646	29%	+19 pp
Romania	2,379	908	38%	+26 pp
Bulgaria	1,098	483	44%	+39 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	2022-07-01	2022-09-26	88
Oryahovo	Bulgaria	2022-07-11	2022-09-23	75
Oltenița	Romania	2022-07-13	2022-09-25	75
Galați	Romania	2022-07-15	2022-09-27	75
Brăila	Romania	2022-07-15	2022-09-27	75
Novo Selo	Bulgaria	2022-07-10	2022-09-21	74
Calafat	Romania	2022-07-10	2022-09-21	74
Corabia	Romania	2022-07-12	2022-09-23	74
Ruse	Bulgaria	2022-07-13	2022-09-24	74
Hârșova	Romania	2022-07-16	2022-09-27	74

The daily series uses the first reading of each day.