<P> Sri Lanka is pockmarked with a large number of irrigation dams with its water resource distributed across nearly the entirety of the island for agricultural purposes via artificial canals and streams . Utilization of hydro resources for agricultural production dates back pre-Colonial era, with current crop productions now largely dependand on these water resources . </P> <P> Irrigation dams with a length and height of more than 100 m (330 ft) and 10 m (33 ft) are listed, including all the state - run hydroelectric power stations . Privately owned "small - hydro" facilities (which are limited to a maximum nameplate capacity of 10 MW), are not included in this list . Nearly all hydroelectric dams are also used for providing water resource for irrigation purposes, hence for the sake of identifying the hydroelectric dams, any dam with hydroelectric involvement is stated as such in the below table, even if the primary purpose of building the dam is to retain water for irrigation . </P> <Table> <Tr> <Th> Dam </Th> <Th> Location </Th> <Th> Purpose </Th> <Th> Length (m) </Th> <Th> Height (m) </Th> <Th> Gen . </Th> <Th> Type </Th> <Th> Ref </Th> </Tr> <Tr> <Td> Bowatenna </Td> <Td> 07 ° 40 ′ 00" N 80 ° 40 ′ 00" E ﻿ / ﻿ 7.66667 ° N 80.66667 ° E ﻿ / 7.66667; 80.66667 ﻿ (Bowatenna Dam) </Td> <Td> Hydroelectricity </Td> <Td> 226 </Td> <Td> 30 </Td> <Td> 40 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Broadlands </Td> <Td> 06 ° 58 ′ 50" N 80 ° 27 ′ 09" E ﻿ / ﻿ 6.98056 ° N 80.45250 ° E ﻿ / 6.98056; 80.45250 ﻿ (Broadlands Hydropower Project) </Td> <Td> Hydroelectricity </Td> <Td> 114 </Td> <Td> 24 </Td> <Td> 35 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Canyon </Td> <Td> 06 ° 52 ′ 18" N 80 ° 31 ′ 34" E ﻿ / ﻿ 6.87167 ° N 80.52611 ° E ﻿ / 6.87167; 80.52611 ﻿ (Canyon Dam) </Td> <Td> Hydroelectricity </Td> <Td> </Td> <Td> </Td> <Td> 100 </Td> <Td> Arch - gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Castlereigh </Td> <Td> 06 ° 52 ′ 24" N 80 ° 33 ′ 59" E ﻿ / ﻿ 6.87333 ° N 80.56639 ° E ﻿ / 6.87333; 80.56639 ﻿ (Castlereigh Dam) </Td> <Td> Hydroelectricity </Td> <Td> </Td> <Td> </Td> <Td> 50 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Deduru Oya </Td> <Td> 07 ° 43 ′ 06" N 80 ° 16 ′ 28" E ﻿ / ﻿ 7.71833 ° N 80.27444 ° E ﻿ / 7.71833; 80.27444 ﻿ (Deduru Oya Dam) </Td> <Td> Hydroelectricity </Td> <Td> 2,400 </Td> <Td> 20 </Td> <Td> 1.5 </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Dyraaba </Td> <Td> 06 ° 53 ′ 13" N 80 ° 57 ′ 23" E ﻿ / ﻿ 6.88694 ° N 80.95639 ° E ﻿ / 6.88694; 80.95639 ﻿ (Dyraaba Dam) </Td> <Td> Hydroelectricity </Td> <Td> 165 </Td> <Td> 50 </Td> <Td> 120 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Gal Oya </Td> <Td> 07 ° 12 ′ 37" N 81 ° 32 ′ 10" E ﻿ / ﻿ 7.21028 ° N 81.53611 ° E ﻿ / 7.21028; 81.53611 ﻿ (Gal Oya Dam) </Td> <Td> Hydroelectricity </Td> <Td> 1,100 </Td> <Td> 43 </Td> <Td> 12 </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Inginimitiya </Td> <Td> 07 ° 56 ′ 40" N 80 ° 07 ′ 54" E ﻿ / ﻿ 7.94444 ° N 80.13167 ° E ﻿ / 7.94444; 80.13167 ﻿ (Inginimitiya Dam) </Td> <Td> Irrigation </Td> <Td> 4,880 </Td> <Td> 18 </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Kalu Ganga </Td> <Td> 07 ° 33 ′ 35" N 80 ° 50 ′ 09" E ﻿ / ﻿ 7.55972 ° N 80.83583 ° E ﻿ / 7.55972; 80.83583 ﻿ (Kalu Ganga Dam) </Td> <Td> Irrigation </Td> <Td> 546 </Td> <Td> 67 </Td> <Td> N / A </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Kandalama </Td> <Td> 07 ° 53 ′ 00" N 80 ° 41 ′ 40" E ﻿ / ﻿ 7.88333 ° N 80.69444 ° E ﻿ / 7.88333; 80.69444 ﻿ (Kandalama Dam) </Td> <Td> Irrigation </Td> <Td> 1,600 </Td> <Td> 21 </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Kantale </Td> <Td> 08 ° 21 ′ 40" N 80 ° 59 ′ 29" E ﻿ / ﻿ 8.36111 ° N 80.99139 ° E ﻿ / 8.36111; 80.99139 ﻿ (Kantale Dam) </Td> <Td> Irrigation </Td> <Td> 4,200 </Td> <Td> 15 </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Kotmale </Td> <Td> 07 ° 03 ′ 39" N 80 ° 35 ′ 50" E ﻿ / ﻿ 7.06083 ° N 80.59722 ° E ﻿ / 7.06083; 80.59722 ﻿ (Kotmale Dam) </Td> <Td> Hydroelectricity </Td> <Td> 600 </Td> <Td> 87 </Td> <Td> 201 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Kukule Ganga </Td> <Td> 06 ° 34 ′ 48" N 80 ° 19 ′ 37" E ﻿ / ﻿ 6.58000 ° N 80.32694 ° E ﻿ / 6.58000; 80.32694 ﻿ (Kukule Ganga Dam) </Td> <Td> Hydroelectricity </Td> <Td> 110 </Td> <Td> 20 </Td> <Td> 80 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Laxapana </Td> <Td> 06 ° 55 ′ 08" N 80 ° 29 ′ 22" E ﻿ / ﻿ 6.91889 ° N 80.48944 ° E ﻿ / 6.91889; 80.48944 ﻿ (Laxapana Dam) </Td> <Td> Hydroelectricity </Td> <Td> </Td> <Td> </Td> <Td> 75 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Lunugamwehera </Td> <Td> 06 ° 21 ′ 11" N 81 ° 12 ′ 09" E ﻿ / ﻿ 6.35306 ° N 81.20250 ° E ﻿ / 6.35306; 81.20250 ﻿ (Lunugamwehera Dam) </Td> <Td> Irrigation </Td> <Td> </Td> <Td> </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Maduru Oya </Td> <Td> 07 ° 38 ′ 53" N 81 ° 12 ′ 50" E ﻿ / ﻿ 7.64806 ° N 81.21389 ° E ﻿ / 7.64806; 81.21389 ﻿ (Maduru Oya Dam) </Td> <Td> Irrigation </Td> <Td> 1,090 </Td> <Td> 41 </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Maskeliya </Td> <Td> 06 ° 50 ′ 37" N 80 ° 32 ′ 56" E ﻿ / ﻿ 6.84361 ° N 80.54889 ° E ﻿ / 6.84361; 80.54889 ﻿ (Maskeliya Dam) </Td> <Td> Hydroelectricity </Td> <Td> </Td> <Td> </Td> <Td> 60 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Moragahakanda </Td> <Td> 07 ° 42 ′ 17" N 80 ° 46 ′ 59" E ﻿ / ﻿ 7.70472 ° N 80.78306 ° E ﻿ / 7.70472; 80.78306 ﻿ (Moragahakanda Dam) </Td> <Td> Hydroelectricity </Td> <Td> </Td> <Td> 65 </Td> <Td> 25 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Moragolla </Td> <Td> </Td> <Td> Hydroelectricity </Td> <Td> </Td> <Td> 35 </Td> <Td> 30 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Norton </Td> <Td> 06 ° 54 ′ 50" N 80 ° 31 ′ 18" E ﻿ / ﻿ 6.91389 ° N 80.52167 ° E ﻿ / 6.91389; 80.52167 ﻿ (Norton Dam) </Td> <Td> Hydroelectricity </Td> <Td> </Td> <Td> </Td> <Td> 50 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Nilambe </Td> <Td> 07 ° 11 ′ 18" N 80 ° 37 ′ 52" E ﻿ / ﻿ 7.18833 ° N 80.63111 ° E ﻿ / 7.18833; 80.63111 ﻿ (Nilambe Dam) </Td> <Td> Hydroelectricity </Td> <Td> 70 </Td> <Td> </Td> <Td> 3.2 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Polgolla </Td> <Td> 07 ° 19 ′ 18" N 80 ° 38 ′ 42" E ﻿ / ﻿ 7.32167 ° N 80.64500 ° E ﻿ / 7.32167; 80.64500 ﻿ (Polgolla Barrage) </Td> <Td> Hydroelectricity </Td> <Td> 144 </Td> <Td> 14.6 </Td> <Td> 40 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Puhulpola </Td> <Td> 06 ° 54 ′ 51" N 80 ° 56 ′ 00" E ﻿ / ﻿ 6.91417 ° N 80.93333 ° E ﻿ / 6.91417; 80.93333 ﻿ (Puhulpola Dam) </Td> <Td> Irrigation </Td> <Td> 175 </Td> <Td> 45 </Td> <Td> NA </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Rajanganaya </Td> <Td> 08 ° 08 ′ 30" N 80 ° 13 ′ 23" E ﻿ / ﻿ 8.14167 ° N 80.22306 ° E ﻿ / 8.14167; 80.22306 ﻿ (Rajanganaya Dam) </Td> <Td> Irrigation </Td> <Td> </Td> <Td> </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Randenigala </Td> <Td> 07 ° 12 ′ 00" N 80 ° 55 ′ 30" E ﻿ / ﻿ 7.20000 ° N 80.92500 ° E ﻿ / 7.20000; 80.92500 ﻿ (Randenigala Dam) </Td> <Td> Hydroelectricity </Td> <Td> 485 </Td> <Td> 94 </Td> <Td> 126 </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Rambakan Oya </Td> <Td> 07 ° 33 ′ 53" N 81 ° 27 ′ 17" E ﻿ / ﻿ 7.56472 ° N 81.45472 ° E ﻿ / 7.56472; 81.45472 ﻿ (Rambakan Oya Dam) </Td> <Td> Irrigation </Td> <Td> 1225 </Td> <Td> 24.7 </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Rantembe </Td> <Td> 07 ° 12 ′ 00" N 80 ° 57 ′ 00" E ﻿ / ﻿ 7.20000 ° N 80.95000 ° E ﻿ / 7.20000; 80.95000 ﻿ (Rantembe Dam) </Td> <Td> Hydroelectricity </Td> <Td> 420 </Td> <Td> 42 </Td> <Td> 52 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Ratkinda </Td> <Td> 07 ° 30 ′ 30" N 81 ° 03 ′ 24" E ﻿ / ﻿ 7.50833 ° N 81.05667 ° E ﻿ / 7.50833; 81.05667 ﻿ (Ratkinda Dam) </Td> <Td> Irrigation </Td> <Td> 4,960 </Td> <Td> 25 </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Samanala </Td> <Td> 06 ° 40 ′ 54" N 80 ° 47 ′ 54" E ﻿ / ﻿ 6.68167 ° N 80.79833 ° E ﻿ / 6.68167; 80.79833 ﻿ (Samanala Dam) </Td> <Td> Hydroelectricity </Td> <Td> 530 </Td> <Td> 110 </Td> <Td> 124 </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Udawalawe </Td> <Td> 06 ° 26 ′ 02" N 80 ° 51 ′ 15" E ﻿ / ﻿ 6.43389 ° N 80.85417 ° E ﻿ / 6.43389; 80.85417 ﻿ (Udawalawe Dam) </Td> <Td> Hydroelectricity </Td> <Td> 3,900 </Td> <Td> </Td> <Td> 6 </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Ulhitiya </Td> <Td> 07 ° 28 ′ 20" N 81 ° 03 ′ 17" E ﻿ / ﻿ 7.47222 ° N 81.05472 ° E ﻿ / 7.47222; 81.05472 ﻿ (Ulhitiya Dam) </Td> <Td> Irrigation </Td> <Td> </Td> <Td> </Td> <Td> N / A </Td> <Td> Embankment </Td> <Td> </Td> </Tr> <Tr> <Td> Upper Kotmale </Td> <Td> 06 ° 56 ′ 48" N 80 ° 39 ′ 29" E ﻿ / ﻿ 6.94667 ° N 80.65806 ° E ﻿ / 6.94667; 80.65806 ﻿ (Upper Kotmale Dam) </Td> <Td> Hydroelectricity </Td> <Td> 180 </Td> <Td> 35 </Td> <Td> 150 </Td> <Td> Gravity </Td> <Td> </Td> </Tr> <Tr> <Td> Victoria </Td> <Td> 07 ° 14 ′ 29" N 80 ° 47 ′ 05" E ﻿ / ﻿ 7.24139 ° N 80.78472 ° E ﻿ / 7.24139; 80.78472 ﻿ (Victoria Dam) </Td> <Td> Hydroelectricity </Td> <Td> 520 </Td> <Td> 122 </Td> <Td> 210 </Td> <Td> Arch </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Dam </Th> <Th> Location </Th> <Th> Purpose </Th> <Th> Length (m) </Th> <Th> Height (m) </Th> <Th> Gen . </Th> <Th> Type </Th> <Th> Ref </Th> </Tr>

What is the largest dam in sri lanka