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 2004: Germany spent the longest below LDC, 15 % 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.

15%14%

2%2%

2%12%

4%13%

7%5%

2004Meanbelow LDC in season

Irrigation season (April–September) 2004
countries	station-days in season	below LDC in season	%	vs. average
Germany	1,647	249	15%	+1 pp
Austria	1,647	1	0%	-1 pp
Slovakia	549	2	0%	-3 pp
Hungary	3,290	64	2%	0 pp
Croatia	732	2	0%	-1 pp
Serbia	2,010	41	2%	-10 pp
Romania	1,464	61	4%	-9 pp
Bulgaria	1,098	77	7%	+2 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
Oberndorf	Germany	2004-09-04	2004-09-24	21
Regensburg Eiserne Brücke	Germany	2004-09-04	2004-09-24	21
Oberndorf	Germany	2004-12-04	2004-12-24	21
Pfelling	Germany	2004-09-05	2004-09-24	20
Deggendorf	Germany	2004-09-06	2004-09-24	19
Oltenița	Romania	2004-09-16	2004-10-01	16
Szob	Hungary	2004-12-14	2004-12-28	15
Bezdan	Serbia	2004-01-01	2004-01-14	14
Novo Selo	Bulgaria	2004-09-14	2004-09-27	14
Calafat	Romania	2004-09-14	2004-09-27	14

The daily series uses the first reading of each day.