The Roof Drain Under a Cloudburst

Show a flat roof in heavy rain from a low angle beside a parapet. In the foreground, water gathers around a shallow drain grate. In the parapet beyond it, a rectangular overflow opening sits visibly higher than the roof membrane and just begins to spill through the wall. Use reflections and a consistent water level to make the height difference clear, with no lightning, flooding interior, or people.

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