Where does the reservoir information come from?

From the Irrigation Department's daily reservoir sheet and the Mahaweli Authority's daily report. Both update about once a day, so check the date shown. This site is independent: for spill-gate warnings follow the Disaster Management Centre and call 117.

Thuruwila Reservoir

Anuradhapura

Thuruwila reservoir is spilling about 357 cusecs and is 89% full. Irrigation Department, 26 Oct.

SpillingSmall release

As of 26 Oct · Checked 2 min ago

89%full

13.8 of 14.8 ft

1.0 ft below full

Level +0.05 m since 23 Oct.

Irrigation Department · 26 Oct

Release now

357 cusecs

Spill

≈ 10,000 L/s · An Olympic pool every ~4 min

2 gates open

1 cusec ≈ 28 L/s

Irrigation Department · 26 Oct

Rain, day before: 0 mm; Irrigation Department · 26 Oct
Holds when full: ~10 million m³; Irrigation Department · 26 Oct
Source: Irrigation Department · 26 Oct Mahaweli Authority · 26 Oct

Recent days

Water depth, % of full supply
Spill · Release (cusecs)

History starts 23 Oct 2026.

Where the water goes

No river gauge of ours is directly below this reservoir.

Figures from the daily Irrigation Department and Mahaweli Authority reports. A blank there shows here as “no data”, never zero.

Common questions

Is Thuruwila releasing water?: Thuruwila reservoir is spilling about 357 cusecs and is 89% full. Irrigation Department, 26 Oct.
Where does the reservoir information come from?: From the Irrigation Department's daily reservoir sheet and the Mahaweli Authority's daily report. Both update about once a day, so check the date shown. This site is independent: for spill-gate warnings follow the Disaster Management Centre and call 117.