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Going back as far as the Roman times, in ancient Rome Man has started using stone to cover up drain covers.
The layman term for drain cover ( http://elmorebank5.sosblogs.com/The-first-blog-b1/We-all-have-been-to-a-pool-area-at-least-more-than-once-in-our-lifetime-b1-p2.htm ) is manhole cover. Say "manhole cover" and pictures of spies/heros making use of the underground sewage system popping out of manhole cover in Hollywood films appear.
Historically from the time that Man invented the sewage system since the Roman Times to drain water and urban waste away for http://www.caflo