Sea level is projected to rise at least 16 inches along the California coast by 2050, with a 55-inch rise predicted by 2100. The primary impacts from sea level rise are increases in flooding and erosion. Sea level rise will expand the area vulnerable to flooding during major storms, as well as in the rare but catastrophic event of a major tsunami. 

The term 100-year flood is used as a standard for planning, insurance, and environmental analysis.  People, infrastructure, and property are already located in areas vulnerable to flooding from a 100-year event. Sea level rise will cause more frequent—and more damaging—floods to those already at risk and will increase the size of the coastal floodplain, placing new areas at risk to flooding.

2/1/13

Parts of New York and New Jersey are still reeling from Superstorm Sandy, an event that brought climate change and the threat of sea-level rise front-and-center. It's a looming problem for all coastal cities, and one that San Francisco has been pondering since long before Sandy struck. Along San Francisco’s western shore, the Ocean Beach Master Plan is a kind of test case for sea-rise planning. It calls for big changes, including a strategy known as managed retreat.

11/28/12


This year America watched sea levels rise and the ocean flood cities across the east coast in late October. Humboldt County faces a similar threat.
 
Mid-November to early December is when flood risk is the highest. A storm during the high tides of that time can overtake the dikes around Humboldt Bay, flood the area and cost the county millions of dollars to recover.

10/10/12

The county is looking at ways to protect coastal com­munities on Humboldt Bay threatened by rising sea levels and aging dikes. The Board of Supervisors on Tuesday voted unanimously to sup­port a recent application for a $250,000 Coastal Conservan­cy grant that would allow nonprofit Coastal Ecosys­tems Institute of Northern California to adapt planning and technical studies associ­ated with sea level rise in Humboldt Bay.

Aldaron Laird of Trinity Associates said at Tuesday’s meeting that the first phase of the project — the first com­prehensive mapping of Humboldt Bay, funded by the Coastal Conservancy — was complete. Seventy-five per­cent of Humboldt Bay’s 102 ­mile shoreline is artificial, Laird said, meaning it needs maintenance.

Laird said Humboldt Bay has the highest rate of sea ­level rise on the West Coast and showed examples of crumbling dikes and shore­line areas that already flood yearly.

Harbor district Director of Conservation Division Dan Berman said it was an important issue for the dis­trict, adding that even if sea level rise goes more slowly than expected, it’s already a problem on the bay.

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