River flood forecast

The Global Flood Awareness System (GloFAS) forecast for 259 of the world's major flood-prone rivers, on every continent: for each, the chance that the river will exceed the flow it normally reaches only once every 2, 5 or 20 years, and when the peak is expected.

Rivers GloFAS is rating

All 255 rivers

Chance, across the GloFAS forecast ensemble, of the river exceeding its 2-, 5- and 20-year flood flow at some point in the forecast. Grouped by region; inside a region, ordered by GloFAS's alert level, then by chance.

Jump to: Africa (61) · Asia (49) · Europe (56) · North America (33) · Oceania (12) · South America (44)

Africa — 61 rivers

Asia — 49 rivers

Europe — 56 rivers

North America — 33 rivers

Oceania — 12 rivers

South America — 44 rivers

4 of the 259 rivers are not in the last reading and are not shown rather than shown from memory. A river is missing because GloFAS did not answer for it, or because it was added to this page after that reading was taken.

What a 2-, 5- or 20-year flood flow is

It is the river flow that, at that point, is reached or exceeded on average once every 2, 5 or 20 years. A 2-year flow typically fills the channel to its banks; a 5-year or 20-year flow goes further. It measures how unusual the flow is, not what it will damage — the same flow can flood a town that has no defences and pass one that does. And "once in 20 years" is an average: two can come in a row.

Where this comes from

GloFAS is part of the European Union's Copernicus Emergency Management Service. It runs a hydrological model with an ensemble of weather forecasts and reports, for points along the world's rivers, how many of those ensemble members push the river past each flood level. This page reads GloFAS's public map service for each river and prints what it reports. Nothing here is recalculated.

Contains modified Copernicus Emergency Management Service information 2026 — the Global Flood Awareness System (GloFAS). GloFAS.