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 2019: Bulgaria spent the longest below LDC, 16 % 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.

2019Meanbelow LDC in season

Irrigation season (April–September) 2019
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	204	12%	-2 pp
Austria	1,647	8	0%	-1 pp
Slovakia	549	11	2%	0 pp
Hungary	3,584	110	3%	+1 pp
Croatia	915	21	2%	+1 pp
Serbia	2,196	225	10%	-1 pp
Romania	2,379	235	10%	-3 pp
Bulgaria	1,098	173	16%	+11 pp
Ukraine	549	51	9%	0 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
Corabia	Romania	2019-09-23	2019-11-12	51
Oryahovo	Bulgaria	2019-09-23	2019-11-12	51
Silistra	Bulgaria	2019-09-25	2019-11-14	51
Hârșova	Romania	2019-09-26	2019-11-15	51
Călărași	Romania	2019-09-26	2019-11-14	50
Izmail	Ukraine	2019-09-28	2019-11-16	50
Svishtov	Bulgaria	2019-09-25	2019-11-12	49
Brăila	Romania	2019-09-28	2019-11-15	49
Reni	Ukraine	2019-09-28	2019-11-15	49
Tulcea	Romania	2019-09-29	2019-11-15	48

The daily series uses the first reading of each day.