The Big U is a protective system around Manhattan, driven by the needs and concerns of its communities. Stretching from West 57th street south to The Battery and up to East 42th street, the Big U protects 10 continuous miles of low-lying geography that comprise an incredibly dense, vibrant, and vulnerable urban area. The proposed system not only shields the city against floods and stormwater; it provides social and environmental benefits to the community, and an improved public realm.