A multi-agent civic-AI system that produces flood-exposure briefings for NYC neighborhoods, where every factual claim cites a public-record source. IBM Granite 4.1 does the reasoning, NASA/IBM Prithvi-EO and TerraMind supply satellite-derived exposure features, and a Mellea-coordinated agent graph pulls from FEMA flood maps, NYC DEP infrastructure data, and historical event records. Built for AMD MI300X, designed so a community board member or local journalist can trace any line in the briefing back to the document it came from.