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.

Sri Lanka Water LevelsLive river-gauge readings

Tissa Wewa

Hambantota

Tissa Wewa reservoir is spilling about 109 cusecs and is 59% full. Irrigation Department, 25 Oct.

SpillingSmall release

As of 25 Oct · Checked 10 min ago

59%full

13.1 of 15.5 ft

2.4 ft below full

Irrigation Department · 25 Oct

Release now

109 cusecs

Spill

≈ 3,100 L/s · An Olympic pool every ~13 min

1 cusec ≈ 28 L/s

Irrigation Department · 25 Oct

Rain, day before: 0 mm; Irrigation Department · 25 Oct
Holds when full: ~4.3 million m³; Irrigation Department · 25 Oct
Source: Irrigation Department · 25 Oct

Recent days

History starts 23 Oct. The trend chart appears after 3 days, check back.

Sat 24
85%
109 cusecs

Water depth, % of full supply · Spill

Where the water goes

No river gauge of ours is directly below this reservoir.

Photos

Tissa Wewa
Photo: Yashaswin Dineth Bamunusingha, CC BY-SA 4.0 via Wikimedia Commons
Tissa Wewa, view 2
Photo: Kasuni Amarasinghe, CC BY-SA 4.0 via Wikimedia Commons
Tissa Wewa, view 3
Photo: Krankman, CC BY 3.0 via Wikimedia Commons
Tissa Wewa, view 4
Photo: Ashen1016, CC BY-SA 4.0 via Wikimedia Commons

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

Common questions

Is Tissa Wewa releasing water?: Tissa Wewa reservoir is spilling about 109 cusecs and is 59% full. Irrigation Department, 25 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.