A new approach to flood management around the San Francisco Bay could trim maintenance costs for water agencies, restore habitat for endangered species, and help protect against rising seas. What links the three? Sediment. Winter storms push sediment down creeks that flow into the Bay and, long ago, these waterways fanned out when they reached the edge. Sediment settled there, nourishing tidal baylands — salt marshes and mudflats that are rich in wildlife, and also buffer the shore from storm surges, the highest tides, and sea level rise. Today few of these low-lying tidal baylands remain.