You ride on: a raft
Water coaster (conveyor)
A simpler water coaster: a moving rubber belt carries your raft up each hill, like the belt at a supermarket.Rubber conveyor belts lift rafts up each hill, like a log flume's lift. Simpler and cheaper than jets or magnets, at the cost of a slower ride.
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Zip Coaster at Kalahari in Ohio works like this. It's slower but cheaper to build.
Examples: Zip Coaster, Kalahari Sandusky