Will Chilaw flood in the next hour?

Chilaw flood risk right now: Alert. This is an estimate based on the Moragaswewa gauge on the Deduru Oya (26 km away), which read 16.1 ft as of Tue, 27 Oct, 2:28 am (Sri Lanka time). In the next hour the Deduru Oya at Moragaswewa could rise to about 16.2 ft (16.1–16.3 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 Chilaw worked out?

From the nearest river gauge ({gauge}, 26 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 Chilaw flooding?

Chilaw, Puttalam

Chilaw flood risk right now: Alert. This is an estimate based on the Moragaswewa gauge on the Deduru Oya (26 km away), which read 16.1 ft as of Tue, 27 Oct, 2:28 am (Sri Lanka time).

Reading at 2:28 am · 16 min ago

Alert

16.1 ft

Next hour

River rising slowly

Next 24 hours

Risk stays high

Move valuables up, charge your phone

Experimental estimate. There is no river gauge in Chilaw; this uses Moragaswewa, 26 km away, plus rain at the town and official warnings.

Call 117 Puttalam 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

Deduru Oya reservoir is releasing 10,400 cusecs through 8 gates
Deduru Oya at Moragaswewa is 16.1 ft, rising (at alert level)
90 mm of rain in the last 24 hours

Your river

Moragaswewa

Deduru Oya · 26 km away

Alert16.1 ft2:28 am

Badalgama

Maha Oya · 37 km away

Alert18.7 ft

Low roads and homes in heavy rain

Heavy rain: low roads and homes may get water

63 mm of rain in the last 24 hours

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

Is there water in your street in Chilaw 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: Moragaswewa gauge on the Deduru Oya, 26 km away

Set your street's flood level

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

Rain in Chilaw

Heavy rain in the last 24 hours (63 mm). Light rain expected this evening, about 6 mm in the next 24 hours.

mm per hour

Tap or hover a bar to see that hour.

Rain map

River map

GaugeReservoirWater being releasedTap a gauge or reservoir for details.

Reservoirs upstream

Deduru OyaSpillingVery large

Official flood map

In the Irrigation Department's maps of past floods (Deduru Oya 2018), these Grama Niladhari divisions around Chilaw were partly or fully under water:

Pitipana South2018
Aluthwatta South2018
Aluthwatta2018
Maikkulama2018
Weralabada2018
Egodawatta2018
Weralabada South2018

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 Chilaw flooding now?: Chilaw flood risk right now: Alert. This is an estimate based on the Moragaswewa gauge on the Deduru Oya (26 km away), which read 16.1 ft as of Tue, 27 Oct, 2:28 am (Sri Lanka time).
Will Chilaw flood in the next hour?: Chilaw flood risk right now: Alert. This is an estimate based on the Moragaswewa gauge on the Deduru Oya (26 km away), which read 16.1 ft as of Tue, 27 Oct, 2:28 am (Sri Lanka time). In the next hour the Deduru Oya at Moragaswewa could rise to about 16.2 ft (16.1–16.3 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 Chilaw worked out?: From the nearest river gauge ({gauge}, 26 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.

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