• This gate remains hinged at the top of the crest of the spillway.
  • This gate when open i.e. when not in position remains swung into a ditch formed at the crest of the spillway.
  • In open position drum of the gate itself forms the crest of the spillway while the framework supporting the skin plate remains in the ditch. See Fig. 14.22 dotted position.
  • The gate remains hinged at point A.
  • The gates is put in closed position with the help of power driven winches only.

Fig. 14.22. U.S.B.R. Drum gates.


  • This gate consists of two parts, one part slipping over the other for some length.
  • It is mostly use for low Navigation dams.