sinkhole drainage

17 LETTERS · STARTS WITH S

sinkhole drainage is a valid 17-letter word worth 25 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1I1N1K5H4O1L1E1D2R1A1I1N1A1G2E1

1 + 1 + 1 + 5 + 4 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 1 + 1 + 2 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does sinkhole drainage mean?