| 21. | Its function was as an hydraulic tower to open the lock gates of the Royal Dock.
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| 22. | In 2014 the lock gates at the dock were replaced by contractor Ravestein ( Netherlands ).
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| 23. | The lock gates are " sector gates " ( pie-slice shaped ), and are made of steel.
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| 24. | As the River Medina is tidal, the marina has lock gates to maintain a sufficient operational depth.
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| 25. | There is a weir ( constructed in 1967 ) and associated lock gates to allow river navigation.
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| 26. | Also to replace newly constructed lock gates.
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| 27. | The lock gates were wide and high.
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| 28. | The engine house provided the power for equipment such as the lock gates and cranes until 2010.
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| 29. | Little now remains of the old lock gates, wooden as they were, although the infrastructure is still evident.
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| 30. | Yeoman was also responsible for setting out towing paths, designing 35 roving bridges, and construction of lock gates.
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