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.

In 1971, most days below LDC were in November

Navigation windows

Days below LDC per month, by Danube sector from upstream to downstream: when draught is restricted. Minimum navigation depths will appear when the official sources deliver them.

28%

days below LDC% of station-days

Sector: Austria · 1 station

Sector: Austria — Navigation windows 1971
Station	RKM	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	days below LDC
Ybbs	2058.8	23	10	16	0	0	0	0	0	10	22	28	22	131
Sector		23	10	16	0	0	0	0	0	10	22	28	22	131

Sector: Hungary · 19 stations

Sector: Hungary — Navigation windows 1971
Station	RKM	Oct	Nov	days below LDC
Nagybajcs	1801.01	0	0	0
Gönyű	1790.55	0	0	0
Komárom	1768.35	0	14	14
Esztergom	1718.65	0	0	0
Szob	1707.2	0	0	0
Nagymaros	1694.6	0	0	0
Vác	1679.5	4	17	21
Óbuda	1654	8	21	29
Budapest	1646.5	3	17	20
Budafok	1636.9	0	0	0
Ercsi	1613.2	0	0	0
Adony	1598.11	0	0	0
Dunaújváros	1580.6	0	0	0
Dunaföldvár	1560.6	0	0	0
Paks	1531.3	0	0	0
Dombori	1506.8	0	0	0
Baja	1478.7	1	18	19
Duna Dunaszekcső	1460	0	1	1
Duna Mohács	1446	0	12	12
Sector		16	100	116

Sector: Croatia · 3 stations

Sector: Croatia — Navigation windows 1971
Station	RKM	Oct	Nov	days below LDC
Aljmaš	1380.25	0	10	10
Vukovar	1333.4	3	21	24
Ilok	1298.7	0	1	1
Sector		3	32	35

Sector: Bulgaria · 6 stations

Sector: Bulgaria — Navigation windows 1971
Station	RKM	Aug	Sep	Oct	Nov	days below LDC
Novo Selo	833	0	0	0	13	13
Lom	743	0	0	0	11	11
Oryahovo	678	8	7	28	27	70
Svishtov	554	0	0	0	15	15
Ruse	495	0	0	0	0	0
Silistra	375	2	4	5	21	32
Sector		10	11	33	87	141

Critical stations of the year 1971

Critical stations of the year 1971
Station	countries	days below LDC	station-days with data	%
Ybbs	Austria	131	365	36%
Oryahovo	Bulgaria	70	364	19%
Silistra	Bulgaria	32	365	9%
Óbuda	Hungary	29	365	8%
Vukovar	Croatia	24	365	7%

The daily series uses the first reading of each day.