Reservoirs (Mahaweli Authority)

The Mahaweli Authority's 47 reservoirs with figures, the hydro power ones among them: storage, % full, water level, rainfall and discharge, daily. Daily, 2026.

Published by the Mahaweli Authority of Sri Lanka; read from Mahaweli Authority, Water Management Secretariat: daily reservoir status.

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Alikotaara reservoir

Storage (Mahaweli Authority)3.95MCM–

Storage, % of gross capacity (Mahaweli Authority)64.0%–

Water level (Mahaweli Authority)210.99m above MSL–

Spill or downstream discharge (Mahaweli Authority)10.7m3/s–

Angamuwa reservoir

Storage (Mahaweli Authority)8.35MCM–

Storage, % of gross capacity (Mahaweli Authority)52.0%–

Water level (Mahaweli Authority)62.42m above MSL–

Basawakkulama reservoir

Storage (Mahaweli Authority)0.87MCM–

Storage, % of gross capacity (Mahaweli Authority)43.0%–

Water level (Mahaweli Authority)83.9m above MSL–

Bowatenna reservoir

Storage (Mahaweli Authority)17.01MCM–

Storage, % of gross capacity (Mahaweli Authority)72.0%–

Water level (Mahaweli Authority)250.32m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)52mm–

Castlereigh reservoir

Storage (Mahaweli Authority)44.38MCM–

Storage, % of gross capacity (Mahaweli Authority)92.0%–

Water level (Mahaweli Authority)1,094.37m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)16mm–

Chandrikawewa reservoir

Storage (Mahaweli Authority)28.56MCM–

Storage, % of gross capacity (Mahaweli Authority)103.0%–

Water level (Mahaweli Authority)61.34m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)56.1mm–

Dambarawa reservoir

Storage (Mahaweli Authority)11.47MCM–

Storage, % of gross capacity (Mahaweli Authority)72.0%–

Water level (Mahaweli Authority)100.64m above MSL–

Dambuluoya reservoir

Storage (Mahaweli Authority)10.81MCM–

Storage, % of gross capacity (Mahaweli Authority)92.0%–

Water level (Mahaweli Authority)161.91m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)91.6mm–

Dayaraba reservoir

Storage (Mahaweli Authority)0.63MCM–

Storage, % of gross capacity (Mahaweli Authority)68.0%–

Water level (Mahaweli Authority)971.5m above MSL–

Diyabana reservoir

Storage (Mahaweli Authority)0.66MCM–

Storage, % of gross capacity (Mahaweli Authority)55.0%–

Water level (Mahaweli Authority)107.4m above MSL–

Giritale reservoir

Storage (Mahaweli Authority)9.82MCM–

Storage, % of gross capacity (Mahaweli Authority)37.0%–

Water level (Mahaweli Authority)86.97m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)5.6mm–

Hadapanagala reservoir

Storage (Mahaweli Authority)11.58MCM–

Storage, % of gross capacity (Mahaweli Authority)56.0%–

Water level (Mahaweli Authority)21.54m above MSL–

Hepolaoya reservoir

Storage (Mahaweli Authority)10.3MCM–

Storage, % of gross capacity (Mahaweli Authority)82.0%–

Water level (Mahaweli Authority)110.03m above MSL–

Huruluwewa reservoir

Storage (Mahaweli Authority)19.85MCM–

Storage, % of gross capacity (Mahaweli Authority)29.0%–

Water level (Mahaweli Authority)127.84m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)22.4mm–

Kalawewa reservoir

Storage (Mahaweli Authority)76.96MCM–

Storage, % of gross capacity (Mahaweli Authority)74.0%–

Water level (Mahaweli Authority)128.07m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)16mm–

Kaluganga reservoir

Storage (Mahaweli Authority)136.95MCM–

Storage, % of gross capacity (Mahaweli Authority)55.0%–

Water level (Mahaweli Authority)194.62m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)12.5mm–

Kandalama reservoir

Storage (Mahaweli Authority)24.63MCM–

Storage, % of gross capacity (Mahaweli Authority)73.0%–

Water level (Mahaweli Authority)174.74m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)17.5mm–

Kantale reservoir

Storage (Mahaweli Authority)42.99MCM–

Storage, % of gross capacity (Mahaweli Authority)31.0%–

Water level (Mahaweli Authority)54.01m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)65.3mm–

Kaudulla reservoir

Storage (Mahaweli Authority)28.41MCM–

Storage, % of gross capacity (Mahaweli Authority)22.0%–

Water level (Mahaweli Authority)67.37m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)22mm–

Kotmale reservoir

Storage (Mahaweli Authority)124.53MCM–

Storage, % of gross capacity (Mahaweli Authority)73.0%–

Water level (Mahaweli Authority)694.75m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)31mm–

Loggaloya reservoir

Storage (Mahaweli Authority)42.71MCM–

Storage, % of gross capacity (Mahaweli Authority)89.0%–

Water level (Mahaweli Authority)110.74m above MSL–

Lunugamwehera reservoir

Storage (Mahaweli Authority)149.23MCM–

Storage, % of gross capacity (Mahaweli Authority)66.0%–

Water level (Mahaweli Authority)55.41m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)4.3mm–

Maduruoya reservoir

Storage (Mahaweli Authority)173.53MCM–

Storage, % of gross capacity (Mahaweli Authority)29.0%–

Water level (Mahaweli Authority)86.66m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)7mm–

Mapakada reservoir

Storage (Mahaweli Authority)5.52MCM–

Storage, % of gross capacity (Mahaweli Authority)58.0%–

Water level (Mahaweli Authority)103.54m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)0.7mm–

Minneriya reservoir

Storage (Mahaweli Authority)90.88MCM–

Storage, % of gross capacity (Mahaweli Authority)67.0%–

Water level (Mahaweli Authority)91.68m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)21.6mm–

Moragahakanda reservoir

Storage (Mahaweli Authority)472.27MCM–

Storage, % of gross capacity (Mahaweli Authority)85.0%–

Water level (Mahaweli Authority)181.9m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)17.5mm–

Moussakele reservoir

Storage (Mahaweli Authority)106.86MCM–

Storage, % of gross capacity (Mahaweli Authority)87.0%–

Water level (Mahaweli Authority)1,165.34m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)8mm–

NDK reservoir

Storage (Mahaweli Authority)4.26MCM–

Storage, % of gross capacity (Mahaweli Authority)22.0%–

Water level (Mahaweli Authority)68.34m above MSL–

Nachchaduwa reservoir

Storage (Mahaweli Authority)27.49MCM–

Storage, % of gross capacity (Mahaweli Authority)49.0%–

Water level (Mahaweli Authority)99.64m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)38mm–

Nuwarawewa reservoir

Storage (Mahaweli Authority)22.7MCM–

Storage, % of gross capacity (Mahaweli Authority)51.0%–

Water level (Mahaweli Authority)85.19m above MSL–

PSS reservoir

Storage (Mahaweli Authority)86.55MCM–

Storage, % of gross capacity (Mahaweli Authority)60.0%–

Water level (Mahaweli Authority)57.03m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)54mm–

Polgolla reservoir

Storage (Mahaweli Authority)3.69MCM–

Storage, % of gross capacity (Mahaweli Authority)90.0%–

Water level (Mahaweli Authority)440.4m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)35.5mm–

Spill or downstream discharge (Mahaweli Authority)29.17m3/s–

Puhulpola reservoir

Storage (Mahaweli Authority)0.63MCM–

Storage, % of gross capacity (Mahaweli Authority)100.0%–

Water level (Mahaweli Authority)986m above MSL–

Rajanganaya reservoir

Storage (Mahaweli Authority)91.31MCM–

Storage, % of gross capacity (Mahaweli Authority)91.0%–

Water level (Mahaweli Authority)67.68m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)20mm–

Randenigala reservoir

Storage (Mahaweli Authority)590.51MCM–

Storage, % of gross capacity (Mahaweli Authority)74.0%–

Water level (Mahaweli Authority)222.27m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)8.7mm–

Rantambe reservoir

Storage (Mahaweli Authority)4.25MCM–

Storage, % of gross capacity (Mahaweli Authority)61.0%–

Water level (Mahaweli Authority)150.12m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)9.8mm–

Ridiyagama reservoir

Storage (Mahaweli Authority)33.77MCM–

Storage, % of gross capacity (Mahaweli Authority)105.0%–

Water level (Mahaweli Authority)20.06m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)90mm–

Samanalawewa reservoir

Storage (Mahaweli Authority)128.98MCM–

Storage, % of gross capacity (Mahaweli Authority)46.0%–

Water level (Mahaweli Authority)439.87m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)10mm–

Sorabora reservoir

Storage (Mahaweli Authority)12.63MCM–

Storage, % of gross capacity (Mahaweli Authority)61.0%–

Water level (Mahaweli Authority)93.92m above MSL–

Thuruvila reservoir

Storage (Mahaweli Authority)7.54MCM–

Storage, % of gross capacity (Mahaweli Authority)75.0%–

Water level (Mahaweli Authority)103.29m above MSL–

Tissawewa reservoir

Storage (Mahaweli Authority)3.22MCM–

Storage, % of gross capacity (Mahaweli Authority)75.0%–

Water level (Mahaweli Authority)90.68m above MSL–

Udawalawa reservoir

Storage (Mahaweli Authority)232.83MCM–

Storage, % of gross capacity (Mahaweli Authority)84.0%–

Water level (Mahaweli Authority)87.26m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)60.2mm–

Ulhitiya reservoir

Storage (Mahaweli Authority)118.61MCM–

Storage, % of gross capacity (Mahaweli Authority)82.0%–

Water level (Mahaweli Authority)105.43m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)3.3mm–

Upper Kotmale reservoir

Storage (Mahaweli Authority)1.26MCM–

Storage, % of gross capacity (Mahaweli Authority)79.0%–

Water level (Mahaweli Authority)1,192.62m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)17.8mm–

Vakaneri reservoir

Storage (Mahaweli Authority)10.96MCM–

Storage, % of gross capacity (Mahaweli Authority)66.0%–

Water level (Mahaweli Authority)14.88m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)15.6mm–

Vendrason reservoir

Storage (Mahaweli Authority)6.44MCM–

Storage, % of gross capacity (Mahaweli Authority)26.0%–

Water level (Mahaweli Authority)49.83m above MSL–

Victoria reservoir

Storage (Mahaweli Authority)627.35MCM–

Storage, % of gross capacity (Mahaweli Authority)87.0%–

Water level (Mahaweli Authority)434m above MSL–

Rainfall, last 24 hours (Mahaweli Authority)3.5mm–

Mahaweli Authority, power station reservoirs

Storage1,649.44MCM–

Storage, % of gross capacity76.0%–

Mahaweli Authority, other hydro reservoirs

Storage889.43MCM–

Storage, % of gross capacity62.0%–

Mahaweli Authority, Mahaweli system reservoirs

Storage415.08MCM–

Storage, % of gross capacity68.0%–

Mahaweli Authority, irrigation reservoirs

Storage685.54MCM–

Storage, % of gross capacity55.0%–

Mahaweli Authority, all 48 reservoirs

Storage3,639.49MCM–

Storage, % of gross capacity66.0%–

Storage (Mahaweli Authority)

MCM, daily. 15 Oct 2026: 3.95

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Published by the Mahaweli Authority of Sri Lanka; read from Mahaweli Authority, Water Management Secretariat: daily reservoir status.

* Calculated by Macro Lab from the published values.