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🚤 How a canal lock raises a boat

Follow a boat through a canal lock and see how gates, paddles, water pressure, and careful sequencing lift it to a higher pound.

4
lessons
~20 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. The chamber between levelsExplain how a lock chamber, gates, and buoyancy connect two canal levels.A lock is a sealed section of canal whose water level can change around a floating boat.
  2. Filling the lockTrace how gates and paddles fill a chamber for an uphill passage.The lower gates seal the boat in, then controlled water flow raises the chamber level.
  3. Leaving at the higher levelCompare uphill and downhill passages and describe staircase locks.Equal water levels permit the next gates to open, while reverse flow lowers a boat and repeated chambers climb a hill.
  4. Water, safety, and trade-offsConnect lock operation with water conservation, safe practice, and hydraulic sequencing.A lock is a timed machine that spends and manages water while people observe each stage.

Questions this course answers

What actually raises the boat in a canal lock?

The boat floats, so it rises with the water surface as the chamber fills.

Put the uphill lock sequence in order.

The gates must seal the chamber before water can fill it, and the next gates open only after levels equalize.

Why must the upper gates stay closed while the chamber fills?

Opening the upper gates before equalization would create a strong flow and could endanger the boat.

How do gates, paddles, water pressure, and buoyancy cooperate to raise a boat?

No single part lifts the boat alone. The lock coordinates controlled water movement with a floating hull.

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