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 2012: Bulgaria spent the longest below LDC, 13 % 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.

2012Meanbelow LDC in season

Irrigation season (April–September) 2012
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	152	9%	-6 pp
Austria	1,647	0	0%	-1 pp
Slovakia	546	2	0%	-3 pp
Hungary	3,460	0	0%	-2 pp
Croatia	915	0	0%	-1 pp
Serbia	2,185	112	5%	-6 pp
Romania	2,379	264	11%	-2 pp
Bulgaria	1,098	139	13%	+8 pp
Ukraine	549	89	16%	+8 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
Isaccea	Romania	2012-12-15	2013-02-21	69
Izmail	Ukraine	2012-08-21	2012-09-27	38
Silistra	Bulgaria	2012-08-20	2012-09-11	23
Oryahovo	Bulgaria	2012-08-18	2012-09-07	21
Călărași	Romania	2012-08-21	2012-09-10	21
Banatska Palanka	Serbia	2012-08-14	2012-09-02	20
Novo Selo	Bulgaria	2012-08-18	2012-09-06	20
Cernavodă	Romania	2012-08-23	2012-09-11	20
Hârșova	Romania	2012-08-24	2012-09-12	20
Reni	Ukraine	2012-08-24	2012-09-12	20

The daily series uses the first reading of each day.