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 2023: Germany 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.

21%14%

2%2%

1%2%

6%11%

2%13%

5%5%

2023Meanbelow LDC in season

Irrigation season (April–September) 2023
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	354	21%	+7 pp
Austria	1,647	0	0%	-1 pp
Slovakia	549	9	2%	0 pp
Hungary	3,660	19	1%	-1 pp
Croatia	915	0	0%	-1 pp
Serbia	2,196	124	6%	-5 pp
Romania	2,379	52	2%	-11 pp
Bulgaria	1,098	53	5%	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
Veliko Gradište	Serbia	2023-09-12	2023-11-01	51
Silistra	Bulgaria	2023-09-22	2023-11-04	44
Galați	Romania	2023-09-30	2023-11-04	36
Oberndorf	Germany	2023-09-25	2023-10-27	33
Tulcea	Romania	2023-10-03	2023-11-04	33
Regensburg Eiserne Brücke	Germany	2023-09-25	2023-10-26	32
Schwabelweis	Germany	2023-09-25	2023-10-26	32
Regensburg Eiserne Brücke	Germany	2023-06-25	2023-07-25	31
Schwabelweis	Germany	2023-06-25	2023-07-25	31
Medveďov	Slovakia	2023-09-28	2023-10-28	31

The daily series uses the first reading of each day.