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by-lead
by-lead n.
Brit. 
/ˈbʌɪliːd/
, /ˈbʌɪliːd/U.S. /ˈbaɪˌlid/
= by-wash n./ˈbaɪˌlid/ΘΚΠ
the world > the earth > water > rivers and streams > stream > [noun] > channel for conveyance of water > for surplus water > for overflow of reservoir, etc.
by-lead1885
by-wash1885
spillway1889
1885 Ogilvie's Imperial Dict. Bye-wash, By-lead, a channel cut to convey the surplus water from a reservoir or aqueduct, and prevent overflow.
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