sewer
‘an artificial channel for carrying off sewage or rainwater’
Lexical development traced from the Tamil root:
E. suer(e), souer, sewre, seward < A.F. sewere, O.N.F. sewiere ‘sluice from a pond’ < Gallo-Rom. exaquaria < Lat. ex ‘out’ + aquaria, aquarius ‘pertaining to water’ < acqua ‘water’ < soouh < akwa- < Tamil ampu