Will the Gin Ganga rise in the next hour?

In the next hour, of the 2 gauges on the Gin Ganga with a forecast, 2 rising. This is a forecast from the recent trend, the gauges upstream and rain, not an official warning.

Which gauges are on the Gin Ganga?

From upstream to downstream: Thawalama, Baddegama.

Where does this come from and how often does it update?

River readings come from the Department of Irrigation's gauges, roughly once an hour, and this page checks for new ones every minute. This site is independent and not an official warning service: follow the Disaster Management Centre and call 117 in an emergency.

Gin Ganga

2 of 2 gauges at alert or above · updated 12:06 am, 47 min ago

As of Tue, 27 Oct, 12:06 am (Sri Lanka time), 2 of the 2 reporting gauges on the Gin Ganga are at or above an official mark (Alert, Minor flood or Major flood): Thawalama (17.3 ft), Baddegama (11.5 ft).

An amber warning reports a risk of minor flooding in low-lying areas of the Gin Ganga Valley in Thawalama, Nagoda, Baddegama and Welivitiya-Divithura within 24 hours; residents and motorists should exercise extreme caution.

Irrigation Department

River map

GaugeReservoirTap a gauge or reservoir for details.

Upstream

Downstream (sea)

Rain on this river

Fell, 24 h (gauge)Satellite, 24 hForecast, next 24 h

Baddegama10317229

Thawalama13115427

Gauge = what the gauge's sensor recorded. Satellite and forecast are estimates over the hills above each gauge. It can differ from the gauges.

Rain map

When does the Gin Ganga flood?

Flood warnings come mostly between November and December.

It’s October: floods are less common than in November, but they do happen.

Recent floods

21 Sep – 28 Sep 2026Baddegama (minor flood)
23 Nov – 24 Nov 2025Baddegama (minor flood)
26 May – 29 May 2024Baddegama, Thawalama (minor flood) · estimated
Biggest since 2022:11 Dec – 25 Dec 2023Baddegama, Thawalama (major flood) · estimated

Every day since 2022, year by year

Official flood map

The Irrigation Department has mapped where past floods on the Gin Ganga reached:

2017: 217 Grama Niladhari divisions in 13 divisional secretariat areas: Akmeemana, Ambalangoda, Baddegama, Bope-Poddala, Elpitiya, Galle4gravets, Hikkaduwa, Nagoda, and 5 more

This shows where a past flood reached, not a flood now. A bigger flood can go further.

Flood maps: Irrigation Department of Sri Lanka

In the newsNews reports, not official.

RiverSource: Ada Derana26 Oct, 10:31 pm (2 h ago)
Irrigation Dept. warns of possible flooding in low-lying areas Gin Ganga(opens the news site in a new tab)

Flood help & emergency numbers

Common questions

Is Gin Ganga flooding now?: As of Tue, 27 Oct, 12:06 am (Sri Lanka time), 2 of the 2 reporting gauges on the Gin Ganga are at or above an official mark (Alert, Minor flood or Major flood): Thawalama (17.3 ft), Baddegama (11.5 ft).
Will the Gin Ganga rise in the next hour?: In the next hour, of the 2 gauges on the Gin Ganga with a forecast, 2 rising. This is a forecast from the recent trend, the gauges upstream and rain, not an official warning.
Which gauges are on the Gin Ganga?: From upstream to downstream: Thawalama, Baddegama.
Where does this come from and how often does it update?: River readings come from the Department of Irrigation's gauges, roughly once an hour, and this page checks for new ones every minute. This site is independent and not an official warning service: follow the Disaster Management Centre and call 117 in an emergency.