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 2013: Bulgaria spent the longest below LDC, 21 % 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.

2013Meanbelow LDC in season

Irrigation season (April–September) 2013
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	38	2%	-13 pp
Austria	1,647	0	0%	-1 pp
Slovakia	548	1	0%	-3 pp
Hungary	3,476	2	0%	-2 pp
Croatia	915	0	0%	-1 pp
Serbia	2,013	214	11%	0 pp
Romania	2,151	389	18%	+6 pp
Bulgaria	1,098	226	21%	+16 pp
Ukraine	549	92	17%	+9 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
Banatska Palanka	Serbia	2013-07-25	2013-09-02	40
Novo Selo	Bulgaria	2013-08-04	2013-09-01	29
Cernavodă	Romania	2013-08-10	2013-09-07	29
Veliko Gradište	Serbia	2013-08-05	2013-09-01	28
Oryahovo	Bulgaria	2013-08-07	2013-09-03	28
Silistra	Bulgaria	2013-08-09	2013-09-05	28
Reni	Ukraine	2013-08-12	2013-09-08	28
Galați	Romania	2013-08-13	2013-09-08	27
Lom	Bulgaria	2013-08-08	2013-09-02	26
Svishtov	Bulgaria	2013-08-09	2013-09-03	26

The daily series uses the first reading of each day.