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🚢 How a lock and dam lifts a ship

Follow a ship through the gates, valves, pools, and buoyant water of a navigation lock, then see how dams and lock staircases turn river height into a climbable route.

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

What you’ll learn

  1. The river has stepsExplain why a dam creates an elevation change and identify the chamber, gates, and pools that make a lock possible.A dam creates linked water levels; the lock is a watertight chamber beside it that lets a vessel cross the height difference.
  2. Going upstreamTrace how a boat enters from the lower pool, rises by gravity-fed filling, and exits after levels equalize.Lower gates admit the boat, valves let higher water fill the chamber, and buoyancy raises the vessel until the upper gates can open.
  3. Going downstreamTrace the reverse lockage and explain why valves, mooring, and equal water levels are needed for a controlled descent.A downbound vessel enters at the upper level, then descends as water drains toward the lower pool before the lower gates open.
  4. Scaling the staircaseDistinguish the jobs of a navigation dam and lock and connect multiple lockages to the idea of a hydraulic staircase.Dams maintain pools and pass water; locks pass vessels. Several chambers can combine to overcome a larger rise while repeating the same hydraulic cycle.

Questions this course answers

What actually raises a boat during an upstream lockage?

Gravity-fed water fills the chamber, and the floating boat rises with its changing water surface.

Why are gates opened only after the water levels match?

Equal levels reduce the pressure difference across the gate and let the vessel pass without a surge.

What is the dam's main navigation role in a lock-and-dam system?

The dam regulates river elevation and flow; the adjacent lock is the vessel passage across the elevation change.

Which sequence describes a boat traveling upstream?

The chamber is matched to the lower pool for entry, then filled until it matches the upper pool for exit.

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