The machinery was powered by water turbines fed by water from the river Lark .
This process created the broken grains that give twiglets their crunchy irregular shape and texture , this water powered mill operating until the last decade of the 20th century in this capacity .
The machinery was powered by water turbines fed by water from the river Lark and this process created the broken grains that give twiglets their crunchy irregular shape and texture , this water powered mill operating until the last decade of the 20th century in this capacity .