Will Negombo flood in the next hour?

Negombo flood risk right now: Alert. This is an estimate based on the Badalgama gauge on the Maha Oya (19 km away), which read 18.5 ft as of Tue, 27 Oct, 1:05 am (Sri Lanka time). In the next hour the Maha Oya at Badalgama could rise to about 18.7 ft (18.5–19.2 ft). This is a forecast for the river, not an official warning, and streets can flood before the river reaches a flood mark.

How is the flood risk for Negombo worked out?

From the nearest river gauge ({gauge}, 19 km away), recent and expected rain, the gauge's forecast and any official warning. It is an estimate for the town, not an official warning, and streets can flood before the river reaches a flood mark.

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.

Is Negombo flooding?

Negombo, Gampaha

Negombo flood risk right now: Alert. This is an estimate based on the Badalgama gauge on the Maha Oya (19 km away), which read 18.5 ft as of Tue, 27 Oct, 1:05 am (Sri Lanka time).

Reading at 1:05 am · 44 min ago

Alert

18.5 ft

Next hour

River rising

Next 24 hours

Risk stays high

Move valuables up, charge your phone

Experimental estimate. There is no river gauge in Negombo; this uses Badalgama, 19 km away, plus rain at the town and official warnings.

Call 117 Gampaha DMC office

Details

How this estimate works

· Starts from the river gauge's own level and forecast, the same as the gauge page.
· Heavy rain here (50 mm in 6 hours or 100 mm in 24 hours) raises it by one step, never more.
· Your own street level, if you set one, and official warnings can raise it further.
· It never says flooding is happening: only a measurement can show that.

Why

Irrigation Department has issued a flood warning for Gampaha
Very heavy rain here: 110 mm in 24 hours. At this much rain, low streets and canal banks in this area often get water
Maha Oya at Badalgama is 18.5 ft, rising (at alert level)
82 mm of rain in the last 24 hours
Water in Negombo drains through canals into the river. When the river is high, rain can stay on the lowest ground near them.

Your river

Badalgama

Maha Oya · 19 km away

Alert18.5 ft1:05 am

Dunamale

Aththanagalu Oya · 29 km away

Minor flood15.1 ft

Low roads and homes in heavy rain

Low roads and homes here often get water at this much rain

110 mm of rain in the last 24 hours

Low ground near the coast, lagoon and drains usually gets water first; higher roads often stay dry.

An early heads-up from rain totals, often wrong; it doesn't mean your street is flooding.

Is there water in your street in Negombo right now?

Your answer helps us check our warnings. It is anonymous: we save only the town and your answer. Nobody sees single answers; we show only totals of 3 or more.

When? (optional)

Is this right?

Each answer helps us improve the forecast for your area.

Based on: Badalgama gauge on the Maha Oya, 19 km away

Set your street's flood level

At what Badalgama reading does water reach your street? Saved on this device only, never sent anywhere.

Rain in Negombo

Heavy rain in the last 24 hours (114 mm). Moderate rain expected this afternoon, about 15 mm in the next 24 hours.

mm per hour

Tap or hover a bar to see that hour.

Rain map

River map

GaugeReservoirTap a gauge or reservoir for details.

Official flood map

None of the Grama Niladhari divisions around Negombo is in the Irrigation Department's maps of past floods on the Maha Oya (2016). Low spots can still flood.

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

Flood maps: Irrigation Department of Sri Lanka

Flood help and phone numbers

Common questions

Is Negombo flooding now?: Negombo flood risk right now: Alert. This is an estimate based on the Badalgama gauge on the Maha Oya (19 km away), which read 18.5 ft as of Tue, 27 Oct, 1:05 am (Sri Lanka time).
Will Negombo flood in the next hour?: Negombo flood risk right now: Alert. This is an estimate based on the Badalgama gauge on the Maha Oya (19 km away), which read 18.5 ft as of Tue, 27 Oct, 1:05 am (Sri Lanka time). In the next hour the Maha Oya at Badalgama could rise to about 18.7 ft (18.5–19.2 ft). This is a forecast for the river, not an official warning, and streets can flood before the river reaches a flood mark.
How is the flood risk for Negombo worked out?: From the nearest river gauge ({gauge}, 19 km away), recent and expected rain, the gauge's forecast and any official warning. It is an estimate for the town, not an official warning, and streets can flood before the river reaches a flood mark.
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.

Maha Oya · Sources: Department of Irrigation gauges, Open-Meteo rain, Disaster Management Centre warnings.