Will Biyagama flood in the next hour?

Biyagama flood risk right now: Alert. This is an estimate based on the Hanwella gauge on the Kelani Ganga (11 km away), which read 22.2 ft as of Tue, 27 Oct, 3:02 am (Sri Lanka time). In the next hour the Kelani Ganga at Hanwella could fall to about 22.1 ft (22.1–22.2 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 Biyagama worked out?

From the nearest river gauge ({gauge}, 11 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 Biyagama flooding?

Biyagama, Gampaha

Biyagama flood risk right now: Alert. This is an estimate based on the Hanwella gauge on the Kelani Ganga (11 km away), which read 22.2 ft as of Tue, 27 Oct, 3:02 am (Sri Lanka time).

Reading at 3:02 am · 30 min ago

Alert

22.2 ft

Next hour

River falling

Next 24 hours

Risk stays high

Move valuables up, charge your phone

Experimental estimate. There is no river gauge in Biyagama; this uses Hanwella, 11 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

Kelani Ganga at Hanwella is 22.2 ft, rising slowly (at alert level)
55 mm of rain in the last 24 hours

Your river

Hanwella

Kelani Ganga · 11 km away

Alert22.2 ft3:02 am

Nagalagam Street

Kelani Ganga · 13 km away

Alert4.5 ft

Is this right?

Each answer helps us improve the forecast for your area.

Based on: Hanwella gauge on the Kelani Ganga, 11 km away

Set your street's flood level

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

Rain in Biyagama

Moderate rain in the last 24 hours (55 mm). Moderate rain expected early this morning, about 15 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.

Reservoirs upstream

Official flood map

In the Irrigation Department's maps of past floods (Kelani Ganga 2016 major flood, 2012 minor flood, 1989 critical flood), these Grama Niladhari divisions around Biyagama were partly or fully under water:

Biyagama East2016, 2012, 1989
Biyagama North2016, 2012, 1989
Yabaraluwa North2016, 2012, 1989
Biyagama West2016, 2012, 1989
Yabaraluwa South2016, 2012, 1989
Biyagama South2016, 2012, 1989
Pahala Bomiriya A2016, 2012, 1989
Siyambalape South2016, 2012, 1989

Flood help and phone numbers

Common questions

Is Biyagama flooding now?: Biyagama flood risk right now: Alert. This is an estimate based on the Hanwella gauge on the Kelani Ganga (11 km away), which read 22.2 ft as of Tue, 27 Oct, 3:02 am (Sri Lanka time).
Will Biyagama flood in the next hour?: Biyagama flood risk right now: Alert. This is an estimate based on the Hanwella gauge on the Kelani Ganga (11 km away), which read 22.2 ft as of Tue, 27 Oct, 3:02 am (Sri Lanka time). In the next hour the Kelani Ganga at Hanwella could fall to about 22.1 ft (22.1–22.2 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 Biyagama worked out?: From the nearest river gauge ({gauge}, 11 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.

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