Flood warnings at Thawalama come mostly between November and December.
Since 23 Nov 2025, this gauge has recorded flooding on 0 days and alert levels on 11 days. The most recent flood was 26 May – 29 May 2024 (minor flood), estimated.
Below each line is what the river gauges recorded; above it, our estimate of how high the rivers ran, going back to 2022. Updated 27 Oct, 1:00 am (Sri Lanka time). Live Thawalama water level →
Tap or hover a day for details. Earlier years are estimates.
Gauge records start 23 Nov 2025
Share of days in each month with at least one gauge at alert or worse at Thawalama.
Runs of days with minor or major flooding, ranked by the worst day.
Gin Ganga at Thawalama: about 12 affected days a year in gauge records since 23 Nov 2025.
Before 23 Nov 2025 there are no gauge records here; estimates suggest about 31 affected days a year in 2022–2024.
Affected means at least alert level. A day counts once, at the worst level any gauge reached. Years before the gauge records start are estimates.
Measured: the highest level each gauge reached that day, compared with the Department of Irrigation’s alert, minor-flood and major-flood levels.
Estimated: for years before the gauge records here begin, we estimate how high each river ran from a global river-flow model. These are not official warnings. They show the flood seasons and the big floods well, but can miss the exact day or gauge, especially on small rivers.
Sources: Department of Irrigation river gauges; earlier gauge readings saved by lk_irrigation; river-flow estimates by Open-Meteo. Download the daily records.