Will Rajagiriya flood in the next hour?

Rajagiriya flood risk right now: Alert. This is an estimate based on the Nagalagam Street gauge on the Kelani Ganga (5.6 km away), which read 4.4 ft as of Tue, 27 Oct, 2:10 am (Sri Lanka time). In the next hour the Kelani Ganga at Nagalagam Street could rise to about 4.6 ft (4.4–4.8 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 Rajagiriya worked out?

From the nearest river gauge ({gauge}, 5.6 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 Rajagiriya flooding?

Rajagiriya, Colombo

Rajagiriya flood risk right now: Alert. This is an estimate based on the Nagalagam Street gauge on the Kelani Ganga (5.6 km away), which read 4.4 ft as of Tue, 27 Oct, 2:10 am (Sri Lanka time).

Reading at 2:10 am · 37 min ago

Alert

4.4 ft

Next hour

Rising with the tide, about the same once the tide is allowed for

Next 24 hours

Risk stays high

Move valuables up, charge your phone

Experimental estimate. There is no river gauge in Rajagiriya; this uses Nagalagam Street, 5.6 km away, plus rain at the town and official warnings.

Call 117 Colombo 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 Kelani Ganga
Kelani Ganga at Nagalagam Street is 4.4 ft, rising (at alert level)
55 mm of rain in the last 24 hours
Water in Rajagiriya drains through canals into the river. When the river is high, rain can stay on the lowest ground near them.

Your river

Nagalagam Street

Kelani Ganga · 5.6 km away

Alert4.4 ft2:10 am

Is this right?

Each answer helps us improve the forecast for your area.

Based on: Nagalagam Street gauge on the Kelani Ganga, 5.6 km away

Set your street's flood level

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

Rain in Rajagiriya

Moderate rain in the last 24 hours (55 mm). Moderate rain expected early this morning, about 19 mm in the next 24 hours.

mm per hour

Tap or hover a bar to see that hour.

Rain map

It is around high tide now. Canals drain slowest for the next hour or so. Next high tide around 3:03 pm.

Sea level at the Kelani mouth is rising (reading 1:15 am). Canal levels: CUrW / SLLDC (pub.curwsl.org)

How water drains here

Water here drains into Parliament Lake (the Diyawanna Oya). From the lake it goes north through the Kolonnawa canal to the Kelani, and south through the Kotte canals to the sea at Wellawatta and Dehiwala. Heavy rain plus high tide or a high Kelani slows draining.

Colombo canals explained

Canal levels now · Parliament Lake and Kotte canals

Diyasaru Uyana Gate USNormal for this canal
3.3 ft above sea level
Reading 1:15 am
Diyatha BridgeNormal for this canal

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, 1989 critical flood), these Grama Niladhari divisions around Rajagiriya were partly or fully under water:

Welikada East2016, 1989
Obeysekarapura2016
Welikada West2016
Gothamipura2016
Kotuwegoda2016, 1989
Madinnagoda2016, 1989
Borella South2016
Borella North2016
and 1 more nearby

Flood help and phone numbers

Common questions

Is Rajagiriya flooding now?: Rajagiriya flood risk right now: Alert. This is an estimate based on the Nagalagam Street gauge on the Kelani Ganga (5.6 km away), which read 4.4 ft as of Tue, 27 Oct, 2:10 am (Sri Lanka time).
Will Rajagiriya flood in the next hour?: Rajagiriya flood risk right now: Alert. This is an estimate based on the Nagalagam Street gauge on the Kelani Ganga (5.6 km away), which read 4.4 ft as of Tue, 27 Oct, 2:10 am (Sri Lanka time). In the next hour the Kelani Ganga at Nagalagam Street could rise to about 4.6 ft (4.4–4.8 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 Rajagiriya worked out?: From the nearest river gauge ({gauge}, 5.6 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.