Will Deniyaya flood in the next hour?

Deniyaya flood risk right now: Normal. This is an estimate based on the Urawa gauge on the Nilwala Ganga (12 km away), which read 7.5 ft as of Tue, 27 Oct, 3:07 am (Sri Lanka time). In the next hour the Nilwala Ganga at Urawa could fall to about 7.4 ft (7.2–7.5 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 Deniyaya worked out?

From the nearest river gauge ({gauge}, 12 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 Deniyaya flooding?

Deniyaya, Matara

Deniyaya flood risk right now: Normal. This is an estimate based on the Urawa gauge on the Nilwala Ganga (12 km away), which read 7.5 ft as of Tue, 27 Oct, 3:07 am (Sri Lanka time).

Reading at 3:07 am · 25 min ago

Normal

7.5 ft

Nilwala Ganga at Urawa is 7.5 ft, falling (near alert level)

Next hour

River falling

Next 24 hours

Check again in a few hours

Experimental estimate. There is no river gauge in Deniyaya; this uses Urawa, 12 km away, plus rain at the town and official warnings.

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

Nilwala Ganga at Urawa is 7.5 ft, falling (near alert level)
38 mm of rain in the last 24 hours

Your river

Urawa

Nilwala Ganga · 12 km away

Normal7.5 ft3:07 am

Pitabeddara

Nilwala Ganga · 17 km away

Normal12.2 ft

Is this right?

Each answer helps us improve the forecast for your area.

Based on: Urawa gauge on the Nilwala Ganga, 12 km away

Set your street's flood level

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

Rain in Deniyaya

Moderate rain in the last 24 hours (38 mm). Moderate rain expected this afternoon, about 18 mm in the next 24 hours.

mm per hour

Tap or hover a bar to see that hour.

Rain map

Did the streets near you get water today?

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)

River map

GaugeReservoirTap a gauge or reservoir for details.

Official flood map

In the Irrigation Department's maps of past floods (Gin Ganga 2017), these Grama Niladhari divisions around Deniyaya were partly or fully under water:

Deniyaya2017
Deniyaya West2017

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 Deniyaya flooding now?: Deniyaya flood risk right now: Normal. This is an estimate based on the Urawa gauge on the Nilwala Ganga (12 km away), which read 7.5 ft as of Tue, 27 Oct, 3:07 am (Sri Lanka time).
Will Deniyaya flood in the next hour?: Deniyaya flood risk right now: Normal. This is an estimate based on the Urawa gauge on the Nilwala Ganga (12 km away), which read 7.5 ft as of Tue, 27 Oct, 3:07 am (Sri Lanka time). In the next hour the Nilwala Ganga at Urawa could fall to about 7.4 ft (7.2–7.5 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 Deniyaya worked out?: From the nearest river gauge ({gauge}, 12 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.

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