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 2015: Bulgaria spent the longest below LDC, 33 % 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.

2015Meanbelow LDC in season

Irrigation season (April–September) 2015
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	449	27%	+13 pp
Austria	1,647	18	1%	0 pp
Slovakia	549	37	7%	+5 pp
Hungary	3,384	372	11%	+9 pp
Croatia	915	23	3%	+2 pp
Serbia	2,160	582	27%	+17 pp
Romania	2,313	627	27%	+15 pp
Bulgaria	1,098	362	33%	+28 pp
Ukraine	549	128	23%	+16 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
Reni	Ukraine	2015-07-27	2015-10-10	76
Galați	Romania	2015-07-29	2015-10-08	72
Brăila	Romania	2015-07-30	2015-10-08	71
Veliko Gradište	Serbia	2015-04-17	2015-06-16	61
Banatska Palanka	Serbia	2015-04-21	2015-06-16	57
Golubac	Serbia	2015-04-21	2015-06-15	56
Izmail	Ukraine	2015-08-22	2015-10-08	48
Corabia	Romania	2015-08-29	2015-10-09	42
Lom	Bulgaria	2015-08-31	2015-10-08	39
Novo Selo	Bulgaria	2015-08-27	2015-10-02	37

The daily series uses the first reading of each day.