Blogs

Some construction questions sound almost too simple to ask. Why are manholes round? Because they're holes? Not necessarily. We make square openings all the time. Rectangular ones too. So somewhere along the way, engineers and utility designers had choices. And yet, all over the world, you keep seeing the same basic thing in streets and sidewalks: A round hole with a round cover. Turns out, there's a pretty good reason for that. Actually, there are several. And one of them is wonderfully simple: …