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The question of why manhole covers are typically round (in some countries) was made famous by Microsoft when they began asking it as a job-interview question.[8] Originally meant as a psychological assessment of how one approaches a question with more than one correct answer, the problem has produced a number of alternative explanations, from the tautological (Manhole covers are round because manholes are round)[8] to the philosophical.
Gratings, often found at the intersections of streets and drain channels, serve as covers for stormwater inlets. These metal or plastic structures provide several critical functions. First and foremost, they allow water to flow into the drainage system while preventing debris, such as leaves, trash, and larger objects, from entering the pipes below. This debris can clog the system, leading to backups and flooding.
drain channel & grating
