A sluicegate at the downstream exit controlled the flow of water into the fields; closing it would flood the fields, opening it allowed the water to drain off again.
2.
By means of the guardgate, the volume of water is regulated at pleasure, and uniform height preserved . . . The expense of maintaining the dam, canals, and main sluicegates, and of regulating the water, is borne by the company.
3.
The dam ended in Felton's Tower, a square fortification designed to protect the sluicegates regulating the water levels of the dam, and the South Gatehouse also called Giffard's Tower originally accessed via a drawbridge, which led into the town.
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