sluicegate
sluice valve
floodgate
penstock
head gate
water gate

Once I'm there, you two be ready to spring for the water gate.

I lowered myself from the window and walked the other way, toward the water gate.

The main entrance was to the south, with a "water gate" facing the river to the north.

Would deep throat have revealed all to us about water gate if he had not assured his own anonymity?

I've got a boat waiting at the northwest water gate.

A water gate allowed access to ships in the river.

Very few people had been selected and given permission to enter the water gate.

They close his water gate and never mention it.

The house was a water gate, inhabited at night by a single watchman.

The museum built over the water gate opened in 1995.