Flooding Study Results Require Action

When heavy rains returned to California last winter after an extensive drought, some Bay Area cities experienced flooding for the first time in many years.  Now, a new study shows that kind of flooding will become chronic in many Bay Area locations in the decades to come.

The Union of Concerned Scientists report provides even more detail on how much climate change will affect specific Bay shoreline cities, and how soon.

As early as 2035, neighborhoods all around the Bay Area–on Bay Farm Island, Alameda, Redwood Shores, Sunnyvale, Alviso, Corte Madera, and Larkspur– would experience flooding 26 times per year or more, and that’s with moderate sea level rise.  By 2060, the number of affected neighborhoods grows to include Oakland, Milpitas, Palo Alto, East Palo Alto, and others along the corridor between San Francisco and Silicon Valley. If the sea level rises faster, that frequency of flooding will occur sooner. Read the full report at http://bit.ly/2vacc5j.

The report raises another problem. The Federal Emergency Management Agency’s maps of flood-prone areas are outdated and don’t reflect sea level rise projections. Those maps determine where property owners can and cannot qualify for federally-subsidized flood insurance, and where communities must construct additional flood protection to retain that insurance.

Outdated maps give communities a false sense of security and lead to uninformed development decisions.  Just ask those homeowners near Coyote Creek in San Jose who were flooded out a few months ago.

The State of California and its agencies, including the Bay Conservation and Development Commission, should be aggressively reducing risks to people and property from climate impacts – that has been explicit in the State’s climate adaptation strategy since 2009.  Pressing FEMA for updated maps should be high on the priority list.

Here’s a report on the UCS study in the San Jose Mercury News, which quotes Save The Bay:

A Feb. 21 photo from a San Jose city worker shows flooding at 1742 Rock Springs Drive. (City of San Jose)
A Feb. 21 photo from a San Jose city worker shows flooding at 1742 Rock Springs Drive. (City of San Jose)

Chronic flooding from rising seas could plague many Bay Area waterfront communities such as East Palo Alto, Alameda and San Mateo within four decades, a nonprofit science group said in a report released Wednesday.

While other studies have predicted inundation of coastal cities, this new study by the Union of Concerned Scientists is the first to put dates on when towns that ring the San Francisco Bay would regularly experience chronic flooding.

Rather than slam shoreline communities with epic floods every few years, rising sea levels threatens to flood streets, yards, parks, homes and businesses in low-lying areas several times a year, the scientists said.

“Cities around the San Francisco Bay will begin to experience more frequent and disruptive flooding in the coming decades and will have to make tough decisions around whether to defend existing homes and businesses or to retreat,” said Erika Spanger-Siegfried, senior analyst in the Climate and Energy Program at UCS and a report author.

Airports and low-income housing in low areas are particularly vulnerable, the study said.

While airports can draw on business income to pay for defenses against rising seas, many poorer neighborhoods are hard pressed to afford bigger seawalls or levees or to move people out of flood-prone areas, said Kristy Dahl, a UCS climate scientist and co-author of the report.

She said the report underscores the need for federal policies to help local communities.

“We shouldn’t have some communities left behind simply because they don’t have the resources of their neighbors,” Dahl said in an Oakland press conference to discuss the study. “A large number of these communities don’t have the resources they truly need to adapt.”

Last year, the federal government announced its first grant to buy and relocate a small town — Isle de Jean Charles, La. — for $48 million after concluding it was not worth trying to save the community in place.

The Union for Concerned Scientists study assessed three scenarios — low, intermediate and high sea-level rise — by the years 2060 and 2100, depending on the pace of emissions and melting rates of polar ice. An interactive series of maps show when inundated communities may reach tipping point, with at least 10 percent of usable land flooded at least 26 times per year.

The study found that:

  • By 2060, in the high sea level rise scenario, parts of many Bay Area communities would face flooding 26 times or more per year, or every other week. Communities with affected neighborhoods include Alameda, Oakland, Palo Alto, East Palo Alto, San Mateo, Burlingame, San Francisco, Corte Madera and Larkspur.
  • By 2100, in the intermediate sea level rise scenario, chronic flooding would affect public infrastructure such as San Francisco International Airport, Oakland International Airport, San Quentin State Prison, Moffett Federal Airfield and the Bay Bridge.
  • By 2100, in the intermediate sea level rise scenario, two Bay Area communities would see more than 10 percent of their land chronically flooded: Alameda and San Mateo.
  • By 2100, in the high sea level rise scenario, more than half of Alameda, about 11 percent of South San Francisco and about 14 percent of Oakland’s land area would be chronically flooded.

“Imagine what it would be like to have your driveway and backyard flooded every every other week on average,” Dahl said, “And you can’t let your kids play in the back yard because it’s flooded.”

The “low scenario” assumes a San Francisco Bay water level rise of around 2 feet by 2100, a carbon emissions decline, and global warming limited to less than two degrees Celsius — in line with the primary goal of the Paris Agreement.

The “intermediate scenario” projects a four-foot water level rise and carbon emissions peaking around mid-century and about four feet of sea level rise globally. In the high scenario, emissions rise through the end of the century and ice melts faster, causing 6.5 feet of sea  level rise.

The group applauded efforts by cities such as San Francisco and Foster City, which already have begun planning where and how to build seawalls and levees. Other regions — such as the cities of Alameda, Hayward and Oakland and Contra Costa, San Mateo, Alameda and Santa Clara  counties — are close behind, identifying potential strategies.

Welcoming the report, David Lewis of the Oakland-based nonprofit Save The Bay said it underscored the need for the Federal Emergency Management Agency to update Bay Area flood maps to reflect new projections. Those flood maps determine where property owners can and cannot qualify for federally-subsidized flood insurance, and where communities must construct additional flood protection to retain that insurance.

He urged the state to press FEMA to update the maps. Congress also must be prodded to provide funding for the updates, he added.

“If maps don’t incorporate projections for sea level rise — and for increased frequency of flooding from extreme storms independent of sea level rise — then communities have a false sense of security, and property values, as well as public and private planning and development decisions, don’t accurately reflect risks,” said Lewis.

“Ask those homeowners near Coyote Creek,” which flooded last winter, he said.


This article was originally published in The Mercury News by Lisa Kreiger and Denis Cuff on 7/12/2017. 

The Three Kings of January 19, 2015: The tide, the location, and one man’s legacy

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January 19, 2015 — A day that could only be described by Martin Luther King Junior himself, “everyone can be great, because anyone can serve…”

Perhaps it was the significance behind this observed holiday, the opportunity to restore the wetlands at Martin Luther King Junior Regional Shoreline, or the anticipation of the King Tides that excited and inspired Save The Bay staff, volunteers, and myself to give back to my community.

My role was to capture still images of the event. During the King Tides walking tour, the volunteers and I learned about the King Tides phenomenon and the vital role our wetlands play in mitigating the impacts of sea level rise.

Not to be confused with climate change, King Tides are the result of a strong gravitational pull exerted by the sun and moon. But, scientists say the high water levels you see in the photographs (above) are projected to become the daily average high tide in the year 2050. This is primarily due to a rise in sea level and destruction of our wetlands which act as a natural buffer. Healthy wetlands help protect coastal communities by soaking up and slowing down water from severe storms, which are expected to become more severe and occur more frequently as sea level rises.

Following the conclusion of the event, I returned to the same restoration site and snapped a few photographs to capture the extremes between high and low tide.

“Who drained the slough?!” I thought to myself.

Within the span of 6 hours the water level fell dramatically, exposing saturated mounds of mud and revealing plants that were once entirely submerged!

As I peered through my camera lens, staring at the muddy puddles in astonishment, the importance of wetland restoration and impact of volunteering became clear to me. Having seen the tide rise as high as the frontage road off of Interstate 880 near the Oakland Coliseum, I know that every acre of restored tidal marsh will help Bay Area communities brace for what is to come – extreme regional flooding over time.

From social to environmental movements, Dr. King taught us that it does not take much to be great. Simply put, a little help will make a lasting impact.

While covering this event is my small contribution to help improve our local region, there is nothing more powerful than seeing what we are capable of together as a community.

To view more photos from this restoration event visit our Facebook Page!