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 1947: Bulgaria spent the longest below LDC, 16 % 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.

3%2%

12%1%

16%5%

1947Meanbelow LDC in season

Irrigation season (April–September) 1947
countries	station-days in season	below LDC in season	%	vs. average
Hungary	2,521	83	3%	+1 pp
Croatia	366	43	12%	+11 pp
Bulgaria	1,098	181	16%	+11 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
Oryahovo	Bulgaria	1947-08-21	1947-11-23	95
Lom	Bulgaria	1947-08-26	1947-11-22	89
Novo Selo	Bulgaria	1947-08-27	1947-11-21	87
Svishtov	Bulgaria	1947-09-01	1947-11-24	85
Silistra	Bulgaria	1947-09-02	1947-11-25	85
Komárom	Hungary	1947-09-07	1947-11-12	67
Duna Mohács	Hungary	1947-09-10	1947-11-15	67
Ilok	Croatia	1947-09-12	1947-11-17	67
Baja	Hungary	1947-09-12	1947-11-15	65
Budapest	Hungary	1947-09-12	1947-11-13	63

The daily series uses the first reading of each day.