A sluice (from the Dutch "sluis") is a water channel controlled at its head by a gate. A mill race, leet, flume, penstock or lade is a sluice channelling water toward a water mill. The terms sluice, sluice gate, knife gate, and slide gate are used interchangeably in the water and wastewater control industry.
A sluice gate is traditionally a wood or metal barrier sliding in grooves that are set in the sides of the waterway. Sluice gates commonly control water levels and flow rates in rivers and canals. They are also used in wastewater treatment plants and to recover minerals in mining operations, and in watermills.
"Sluice gate" refers to a movable gate allowing water to flow under it. When a sluice is lowered, water may spill over the top, in which case the gate operates as a weir. Usually, a mechanism drives the sluice up or down. This may be a simple, hand-operated, chain pulled/lowered, worm drive or rack-and-pinion drive, or it may be electrically or hydraulically powered.
When Annis built this cage
I saw the blueprint on the table
But I was too young to run
She lured me from my play
To her clandestine domain
To tend her illicit garden
Black, black soul
And Annis takes her toll
And from her veil of black
With all the mirrors at her back
She called me into her guarded empire
I treaded soft and lightly
Fear trembling so slightly
Snows in my bones I dream of the white sea
Chorus:
Black, black soul
And Annis takes her toll
Child of sin
Black Annis wins again
When Annis roared and jeered
I knew that no one leaves from here
Her fervid anger don't spare anything
In the frenzy of my senses
She confiscated my defenses
With all the forces of night
When Annis built this cage
I saw the blueprint on the table
But I was too young to run
She lured me from my play
To her clandestine domain
To tend her illicit garden
(Chorus 2x)