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Moreover, drain covers protect the drainage systems from costly blockages. Roads are often littered with debris, including leaves, dirt, and litter. If these materials were to enter the drainage system, they could cause significant clogs, leading to the need for expensive repairs and maintenance. By adequately covering drainage points, drain covers serve as a barrier against this debris. Regular maintenance of drain covers is also essential; any damages or misalignments should be addressed promptly to ensure optimal functioning.
drain cover on road

Another important design feature is the height of the step irons. They must extend sufficiently above the edge of the pit to allow users to grip them safely while ascending or descending. This consideration is particularly important in deeper pits where falls can result in serious injury.
step irons in pits

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.