Rowan’s Canal Boat

Rowan and Nell help Grandad build a model canal on the garden table. Two clear basins hold different depths of water. A little red boat waits in the lower basin, but Rowan wants it to reach the higher one without being lifted by hand.

“We could push it over the wall,” Nell suggests. Rowan tries gently, but the boat catches against the divider. Grandad asks them to notice the water on each side. The boat floats easily, yet the higher water is still beyond its reach.

Grandad shows them a narrow chamber between two gates. It is a model lock, which can raise a boat with water. Rowan opens the lower gate and guides the boat inside, then closes that gate carefully before touching anything else.

Nell pours water slowly into the closed chamber from a blue jug. As the water rises, the red boat rises too. Rowan watches its sides to make sure it stays clear of the walls. Soon it floats level with the higher basin.

They open the upper gate and guide the boat into the higher water. Nell grins at Grandad. “The water did the lifting!” Rowan notices that the boat has not needed wheels or a ramp, only enough room to float as the level changes.

For the return trip, they guide the boat back into the chamber and close the upper gate behind it. Grandad helps them release water through a small outlet. They watch the level drop slowly until it matches the lower basin, keeping the lower gate shut while it falls.

Rowan opens the lower gate, and Nell guides the boat out. This time they can explain why the gates must not both open at once. The chamber needs to hold its own water level while the boat moves between the two different heights.

Before they empty the model, Rowan draws three pictures of their boat going up. Nell adds arrows to show where the water goes. Grandad asks which part surprised them most. “It looked like a wall,” Rowan says, “until we found the water lift.”