Where a Street Drain Can Take the Rain

Water disappears into a street drain, but the grate does not show you where it goes next. It is tempting to imagine one universal underground route. The Environmental Protection Agency describes two different arrangements: separate systems and combined systems. We will draw both, then explain why the difference matters when rain changes the amount of water entering them. Hidden in Plain Sight: everyday details, hidden systems. Look closer. Sources: https://www.epa.gov/npdes/combined-se... Original simplified diagrams; not to scale. No music. Narration uses a digitally rendered version of the channel owner’s voice.