Make them 100 turns to build and no shorter than 10 turns per square no matter how many workers you have working the site. That way you can have ships move across continents to lakes etc or move from one body of water to another even when there is a two spaces wide spot of land in the way.
When a canal is built on a piece of land that land cannot be pillaged (unless hit by a nuclear device). However the locks can be damaged instead. This would mean the canal cannot be used until fixed by workers (another 100 turns to remove and fix the damaged locks).
When a canal is built on a piece of land that land cannot be pillaged (unless hit by a nuclear device). However the locks can be damaged instead. This would mean the canal cannot be used until fixed by workers (another 100 turns to remove and fix the damaged locks).
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