River Severn | River Thames
A lock and weir system is needed where the river bed is steep and the water flows too quickly. Many rivers have locks so that boats can navigate rivers better.
How locks work
The first lock gates open and the boat sails into the full lock.
The first gates are closed.
The water is slowly drained out of the lock until it reaches the same level as the river below the lock.
The second lock gates are then opened and the boat sails on its way.
Back to river features