+A **sewer** is an underground passage, a hidden vein beneath cities, collecting and transporting [Wastewater](/wiki/wastewater). This silent network of [Conduit](/wiki/conduit) is critical for public health and environmental protection.
+## See also
+- [Drainage](/wiki/drainage)
+- [Plumbing](/wiki/plumbing)
+- [Sanitation](/wiki/sanitation)
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