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Neil

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Fascinating TonyV.

I had untill now thought that the need for locks was because the tidal level was different on the oceans at each side at any given time.

Do they have to pump the water back up the mountains when the locks are used or is the canal refilled by rivers/streams?

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There's only about 8 inches difference in water level between the two oceans, the Pacific is higher. I think it's about 48 inches for the Suez canal, and there is an average flow from the Red Sea into the Med - with consequent problems for marine life.

There's a big lake at the top of the Panama Canal, which feeds it. I don't think it needs pumping back up.

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