A decades-old plan to protect Alviso and surrounding South Bay areas from devastating floods has moved closer to reality with $177 million in federal funds to begin work on a 4-mile-long levee and wetlands restoration.

The combination of flood control and environmental improvements will be a model for the rest of the country, Sam Schuchat, executive officer of the state Coastal Conservancy, said Friday at an event celebrating the project at the Don Edwards San Francisco Bay National Wildlife Refuge in Alviso.