|Water from the dam is fed through a pentrough. This controls the rate at which the water falls on to the wheel and so controls the speed of the wheel.
Inside the pentrough is a sluice or gate which can be raised or lowered to control the flow of water over the wheel.
There are two pentroughs at Abbeydale, one for the Tilt Wheel and one for the Grinding Hull Wheel. The other wheels are also fed from these two pentroughs.