bury ▁Well s <0x0A> </s> ▁The ▁Cast l ere igh ▁Dam ▁( also ▁sp elled ▁Cast l ere agh ) ▁is ▁a ▁gravity ▁dam ▁built ▁across ▁the ▁Ke hel g am u ▁O ya , ▁a ▁major ▁trib ut ary ▁to ▁the ▁Kel ani ▁River , ▁approximately ▁ ▁south - west ▁of ▁Hat ton , ▁in ▁the ▁Central ▁Province ▁of ▁Sri ▁L anka . ▁ ▁Res er voir ▁and ▁power ▁station ▁ ▁The ▁dam ▁creates ▁the ▁icon ic ▁Cast l ere igh ▁Res er voir , ▁which ▁is ▁almost ▁entirely ▁maintained ▁by ▁the ▁in flow ▁of ▁water ▁from ▁the ▁Ke hal g am u ▁O ya . ▁Water ▁from ▁the ▁res er voir ▁is ▁di vert ed ▁to ▁the ▁W imal as ur endra ▁Power ▁Station , ▁located ▁approximately ▁ ▁further ▁down stream ▁at ▁, ▁near ▁N orton ▁Bridge . ▁The ▁power ▁station ▁dis charg es ▁the ▁water ▁into ▁the ▁N orton ▁Res er voir , ▁created ▁by ▁the ▁N orton ▁Dam , ▁located ▁at ▁the ▁same ▁site . ▁ ▁The ▁power ▁station ▁consists ▁of ▁two ▁ 2 5 - m eg aw att ▁units , ▁tot alling ▁the ▁plant ▁capacity ▁to ▁. ▁Both ▁units ▁were ▁commission ed ▁in ▁. ▁ ▁Water ▁air port ▁ ▁The ▁Cast l ere igh ▁Res er voir ▁is ▁also ▁home ▁to ▁the ▁Cast l ere igh ▁Water ▁Airport , ▁registered ▁under ▁the ▁I ATA ▁code ▁N U F . ▁ ▁See ▁also ▁▁▁ ▁List ▁of ▁d ams ▁and ▁res er voir s ▁in ▁Sri ▁L anka ▁