Devastating floods are almost annual occurrences in the West and
in California. With the anticipated sea level rise and other
impacts of a changing climate, particularly heavy winter rains,
flood management is increasingly critical in California.
Compounding the issue are man-made flood hazards such as levee
stability and stormwater runoff.
At the July meeting of the Delta Stewardship Council,
councilmembers heard briefings on the activities of the Delta
Protection Commission and the Delta Conservancy, and an update
on the Central Valley Flood Protection Plan.
After years marked by a historic statewide drought and
devastating floods around downtown San Jose, Santa Clara
County’s largest water provider has decided to ask voters to
approve a parcel tax to pay for a wide variety of projects,
from flood control to creek restoration, along with some costs
of rebuilding the county’s largest dam at Anderson Reservoir.
If California lawmakers set aside climate concerns like sea
level rise, and focus only on the pandemic, the state could be
setting itself up for an even worse economic hardship, the
nonpartisan Legislative Analyst’s Office cautioned in a report
By the 2070s, climate change will reduce snowpack and increase
extreme rainfall in the Sierra Nevada and California’s
reservoirs will likely be overwhelmed. That’s according to a
new study by UCLA climate scientists, who predict that run-off
during so-called atmospheric rivers will increase by nearly 50
percent, leading to widespread flooding across the state.
The loss in hydroelectric generation during the 2012-16 drought
cost PG&E and other California utilities about $5.5
billion, a new study says. As California’s climate becomes more
prone to severe droughts, the findings point to future costs
that utilities — and ultimately ratepayers — will likely be
forced to bear.
A group dedicated to protecting the Ballona Wetlands is among
the plaintiffs in a lawsuit alleging millions of dollars in
public funds have been misused for what they claim is a
“deceptive” plan to bulldoze the ecological reserve under the
guise of being a restoration effort.
The state will suffer dire long-term consequences if lawmakers
set aside concerns about rising seas to focus solely on
COVID-19, the non-partisan Legislative Analyst’s Office warned
Monday. Sea level rise will likely put at least $8 billion in
property underwater by 2050, and could affect tens of thousands
of jobs and billions in gross domestic product, according to
studies cited by the office. Sea level rise and related
flooding and erosion … also pose threats to water treatment
plants, roads, marinas, ports and railways.
People hoping to get a handle on future droughts in the
American West are in for a disappointment, as new University of
Southern California-led research shows El Niño cycles are an
unreliable predictor. Instead, they found that Earth’s dynamic
atmosphere is a wild card that plays a much bigger role than
sea surface temperatures, yet defies predictability, in the wet
and dry cycles that whipsaw the western states.
In California, many of the wildfires occur in the Sierra Nevada
mountains, which are the source of 70% of California’s water
resources. Understanding the feedbacks and implications of
disturbances on the hydrological cycle can help watershed
managers plan for future scenarios with wildfires and climate
Nearly 200,000 people were evacuated when the spillways failed
at Oroville Dam in 2017, an infrastructure disaster that cost
around a billion dollars to repair. Three years later
scientists say events that partially led to the incident could
become more frequent. It comes down to how and when snow and
The effort is part of an overall plan to develop a Lower Cache
Creek flood study through the US Army Corps of Engineers, the
Central Valley Flood Protection Board and the California
Department of Water Resources. And despite any objections to
the project, it may be more than five years before the first
spadeful of earth is turned to build the barrier.
As part of Valley Water’s mission to provide flood protection
for our communities, we are continuously preparing for the
possibility of flooding. We must regularly keep our streams and
creeks well maintained to handle the rainy season and protect
the many species of wildlife that live there.
Much needed work at Schafer Dam at Success Lake is finally set
to begin. The U.S. Army Corps of Engineers Sacramento District
will begin construction to realign Avenue 146 and widen the
existing Tule River Spillway at Success Lake in Porterville on
Senator Dianne Feinstein (D-Calif.) joined Senator John Kennedy
(R-La.) to introduce legislation to amend the Nutria
Eradication and Control Act. The legislation would authorize an
additional $6 million a year to increase assistance for states
that implement initiatives to eradicate the invasive species.
Legislation authorizing the Army Corps of Engineers to boost
the nation’s water infrastructure, protect waterways from
emerging contaminants, and bolster coastal shorelines sailed
through the House Wednesday. On a voice vote, the House used a
procedure reserved for mostly non-controversial legislation to
pass the bipartisan Water Resources Development Act of 2020…
Last rainfall season was a big one for the Central and South
Coasts, with above average rainfall for many drought impacted
local communities. … But, could we be headed back to a
drought year? There are some early indications it’s a
possibility, with a nearly 50-50 chance of us being impacted by
a “La Niña” pattern of cooler ocean water in the Western
Gov. Gavin Newsom released strategies Tuesday to improve
drinking water quality, revive a stalled multibillion-dollar
tunnel and build new dams. Newsom says the sweeping water
portfolio will help the Golden State prepare for global warming
by reinforcing outdated water infrastructure and reducing the
state’s reliance on groundwater during future droughts.
Nearly 230 wildlife species depend on Sacramento Valley rice
fields for food and a resting place, including the giant
gartersnake, a threatened species. Although it has “giant” in
its name, this creature is, at most, five-feet long. These
snakes are heavily dependent on rice fields for their survival;
having lost most of their earlier habitat – traditional
The Senate has confirmed Maj. Gen. Scott A. Spellmon as the
Army’s 55th Chief of Engineers and commanding general of the
Corps of Engineers, elevating him to one of the most crucial
infrastructure-related positions in the federal government.
Yuba Water Agency’s Board of Directors Thursday authorized
staff to move forward with a new design of an estimated $225
million secondary spillway at New Bullards Bar Dam, marking an
important step forward for the agency’s largest project to
reduce flood risk since the dam was built.
What was extraordinary was the unusually deep snow recorded in
the northern Sierra Nevada mountains before the storm event.
Subsequently, several records were set for how much snowmelt
occurred during the atmospheric river. The melt took place
because of unusually warm and wet conditions, and it increased
water available for runoff by 37 percent over rain alone,
straining the capacity of California’s second-largest
A largely ignored waterway in El Cajon is about to get some
much-needed TLC through $2 million in grant money. Broadway
Creek, a sliver in the 52-mile San Diego River watershed, runs
behind businesses along Broadway. Much of the creek and its
wetland habitat sit between homes and an apartment complex near
Magnolia Avenue, in the heart of the city.
U.S. dam safety frameworks have helped to prevent major
calamities, but the May collapse of the 95-year-old Edenville
Dam in Michigan illustrates that key failure risks remain—often
involving many causes, according to a study of dam safety risk
assessments by Oak Ridge National Laboratory.
Imperial Beach Mayor Pro Tem Paloma Aguirre joined Good Morning
San Diego to discuss a new report claiming that an audit done
by Baja California governor accuses big US companies of water
theft and contributed to raw sewage and hazardous pollutants
ending up in the Tijuana River.
A water main break has caused major flooding on part of
southbound Highway 99 at 12th Avenue in Sacramento, California
Highway Patrol officials confirmed Monday evening. … Tim
Swanson, a spokesperson for the City of Sacramento, said the
break started as a leak that was expected to be repaired in the
FEMA maps show that roughly 500,000 California properties are
at substantial likelihood of flooding, with a 1% chance of
being flooded in any given year. The study found that more than
twice that amount—1.1 million properties—are already at this
level of risk, and that an additional 150,000 properties will
join them in the next 30 years, mainly because of rising seas.
The latest proposal would trim the budget by $2 billion and the
storage capacity by about 300,000 acre-feet, according to Jerry
Brown, the new executive director of the project. Sites would
use existing canals for conveyance rather than build new
pipelines. The plan also eliminates a pumped-storage system for
generating and storing energy during high flow events. He said
the business case for that element of the project “just didn’t
Da Yang, an atmospheric scientist at UC Davis and his
co-authors predict the entire West Coast will experience
greater month-to-month fluctuations in extremely dry and wet
weather, especially in California. The study explores the
Madden-Julian oscillation (MJO), an atmospheric phenomenon that
influences rainfall in the tropics…
The Anderson Reservoir in Morgan Hill held back by a 240-foot
dam built in 1950 could be rebuilt following the State
Assembly’s passage of AB 3005 in June. … The project would
cost about $576 million but still needs to pass through the
“I secured provisions in this bill to authorize and expedite
construction of flood protection and aquatic ecosystem
restoration projects, address harmful algal blooms in the
Sacramento-San Joaquin Delta, and give local agencies greater
flexibility in using federal Army Corps funds to meet local
California’s wild weather swings, from pounding rain to drought
and from fires to floods, are widely expected to worsen as the
climate warms. A new study shows just how severe things might
get, and it’s not pretty.
A multibillion-dollar measure that would help build, repair,
and maintain a wide variety of water infrastructure projects
sailed through the House Transportation and Infrastructure
Committee Wednesday. Approved unanimously by voice vote, the
Water Resources Development Act of 2020 (H.R. 7575) would
authorize the Army Corps of Engineers every two years to carry
out specific projects and feasibility studies.
The high-tide flooding that inundated the streets of Newport
Beach’s Balboa Peninsula over the Fourth of July weekend will
grow ever-more common throughout the state — and nation —
thanks to rising seas, according to a National Oceanic and
Atmospheric Administration’s report released Tuesday, July 14.
California’s state budget includes $47 million to help the
Salton Sea. The new budget was signed by Governor Newsom last
month. … News Channel 3’s Madison Weil spoke with Phil
Rosentrater, the executive director of the Salton Sea
Authority, to see how the new funds will be used.
The “Guardians of the Reservoir” challenge seeks ideas to
remove or transport the amount of sediment building up in the
reservoirs, replacing available space for water storage, that
provide critical water supplies for the country. There will be
up to a total of $550,000 in cash prizes available for the
three-phase the competition.
For 50 years, Flood Insurance Rate Maps (FIRMs) have
unintentionally stifled conversations of flood risk. They have
encouraged property-owners and governments at all levels to
dwell on map details for one static event, rather than flood
risks for a range of events… Now, First Street Foundation has
released a new tool that can change how these conversations
The Consul General of Mexico in San Diego said there are things
happening in Tijuana that will help. In a written statement
responding to questions by KPBS, Carlos González Gutiérrez said
there are several projects underway.
A vision first formed in the early 1990s finally came to
fruition when the U.S. Fish and Wildlife Service gave the San
Bernardino Valley Water Conservation District authority to
manage a long-awaited project that will benefit water,
environmental, economic and community interests in the Upper
Santa Ana River Wash.
For the past two decades, dams have been falling across the
United States in a bid to reverse a legacy of destruction of
fish and their habitat. … But in southwestern Washington, a
local flood control district is going against the flow by
proposing a major new dam on the Chehalis River. … The
Chehalis is a critical salmon stream and the largest river
system fully contained within the state’s boundaries.
The federal Climate Prediction Center issued a La Nina watch
Thursday, indicating the odds favor the Pacific Ocean cooling
in the next six months and enhancing the chances for a cold and
wet upcoming winter in the Northwest.
Reps. Grace F. Napolitano (D-CA-32) and Linda T. Sánchez
(D-CA-38) announced that the FY2021 Energy and Water
Appropriations bill is providing $384,900,000 as part of the
U.S. Army Corps of Engineers’ Dam Safety and Seepage Program.
With support from EDF, four UC Santa Barbara graduate students
have developed a new mapping tool for California’s Central
Valley to identify the best locations for groundwater recharge
to secure these bonus benefits. The tool, called Recharge for
Resilience, is available online and also can be downloaded by
users with more technical expertise.
In five decades of public service Phil Isenberg has served as
mayor of Sacramento, a member of the Assembly, a lobbyist,
chairs of the Marine Life Protection Blue Ribbon Task Force,
the Delta Vision Blue Ribbon Task Force, and, until 2016, the
Delta Stewardship Council. … In a two-part oral history with
Chris Austin, editor of Maven’s Notebook, Isenberg details the
myths and complexities of California water politics.
Pasadena conservationist groups secured a major victory on
Tuesday when the Los Angeles County Board of Supervisors
approved a settlement agreement, ending a protracted legal
battle centered on the removal of 1.7 million cubic yards of
sediment from the Devil’s Gate Dam and its potential
The city of Imperial Beach, environmental advocacy group
Surfrider Foundation and the San Diego Regional Water Quality
Control Board agreed to put down their proverbial legal swords
for a period of 12 months while the U.S. Environmental
Protection Agency puts a stack of cash to work on the
decades-long sewage issue plaguing the Tijuana River watershed.
This brown bag seminar is part of the selection process for a
California Sea Grant Extension Specialist who will be hired
jointly with the Delta Stewardship Council. The position with
the Delta Stewardship Council will provide leadership in
advancing collaborative partnerships and initiatives and in
catalyzing and implementing social science research to inform
management of the Sacramento-San Joaquin Delta region of
The Fremont Weir Adult Fish Passage Modification Project, which
began modified operations in January of 2019, successfully
allowed thousands of migrating fish to pass between the
Sacramento River and Yolo Bypass in its first year of
A total of $83.9 million grant funding has been issued to
communities in San Diego, San Joaquin, Sacramento, Sierra and
Central Coast regions. The funding is aimed at supporting
projects to address infrastructure needs, depleted groundwater
levels, flood control issues, and other water issues of
Stream gages are critical for managing California’s water
resources. The devices help with early flood warning and
generate important data used by the Department of Water
Resources (DWR), and other state and federal agencies.
Adapting to climate change, coupled with the need to address
aging infrastructure, population growth, and degraded
ecosystems, requires significant investment in natural and
built water systems. These investments present a significant
opportunity to support not only water, but to provide economic,
social, and environmental benefits.
Across much of the United States, the flood risk is far greater
than government estimates show, new calculations suggest,
exposing millions of people to a hidden threat… That new
calculation, which takes into account sea-level rise, rainfall
and flooding along smaller creeks not mapped federally,
estimates that 14.6 million properties are at risk from what
experts call a 100-year flood, far more than the 8.7 million
shown on federal government flood maps. [See the map to explore
county flood risk in California and the West.]
There can be little argument that many of the more than 90,000
dams in this country are in need of immediate attention. The
catastrophic failure of two dams in Michigan last month
following an extraordinary amount of rain in a relatively short
period, highlights a number of issues:
Voters approved a $90 million general obligation bond for the
project in 2018, and construction was supposed to be complete
by December of this year. Now officials are expecting the
project to cost about $109 million and not be complete until
California has the most variable weather conditions in the
United States, often varying between extremes such as drought
and flood. Our ability to forecast variable weather conditions
well in advance is a driving factor in how water managers
maximize the benefits and minimize the hazards of each storm.
The project — managed jointly by California Division of Fish
and Wildlife, the Department of Water Resources and the
Department of Parks and Recreation — seeks to make changes in
Franks Tract with the goal of improving water quality,
providing enhanced recreational opportunities and improving the
ecology for the benefit of native and desirable wildlife.
As crews continue to battle a human-caused wildfire that has
become one of the largest in Arizona history, state agencies
are concerned about the potential impact on wildlife and water
resources. The Bush Fire, now the fifth-largest fire on record,
had burned 186,086 acres in the Tonto National Forest as of
Monday morning… The Tonto National Forest encompasses some of
the main water sources for Phoenix residents.
As winter rains intensify with climate change, flooding will
worsen in Santa Clara County, the Bay Area’s largest by
population… The Coyote Creek system — 1,500 miles of
waterways that drain a 350-square-mile watershed — connects
half a dozen elements that are key to climate adaptation, from
reservoirs to creek confluences to the Bay shore.
Encouraged by a recently vetted new method for creating carbon
offsets from wetlands, a flurry of new climate adaptation
projects on publicly owned islands strewn along the central
Delta corridor aim to defend against sea-level rise, restore
habitat, and reduce greenhouse gas emissions.
In recognition of the immense opportunity for recovery in Elk
River, CalTrout, the North Coast Regional Water Board, and
several project partners joined together to form the Elk River
Watershed Stewardship Program. The purpose is to engage with
the Elk River community to develop a landowner supported
recovery plan to reduce nuisance flooding, address the severe
sediment impairment, and rehabilitate habitat for native
Driving on Highway 101 from the South Bay, up the Peninsula,
commuters zoom by nearly invisible infrastructure keeping the
highway and nearby communities dry. Beyond the highway, at the
edge of the San Francisco Bay, are levees and tide gates
protecting roads and neighborhoods against high tides and storm
flooding. Unless you visit the bay lands to walk the levee
trails, you might never know these important structures exist.
Aaron Thomas arrived back in Paradise Valley just in time to
christen the Ambiente Course, which proved a sort of launching
pad for all manner constructive, on-course experimentation. …
Thomas confirms the new design saves between 45 million and 55
million gallons of water annually, compared to pre-2013 levels.
That is the platform from which Thomas has worked these past
Existing residents in the 200-year-flood zone are not off the
hook when it comes to paying for more robust protection. …
That’s because fees assessed on new growth — homes, commercial
and industrial concerns — being built in the flood zone only
will cover a third of the bill.
In an effort to move forward a $576 million Anderson Dam
Seismic Retrofit Project, the California State Assembly passed
AB 3005 on June 8, the Expedited Dam Safety for Silicon Valley
Act, facilitating the construction of the project. Assemblyman
Robert Rivas (D-Hollister, Calif.), who wrote the bill, says
the overwhelming vote of bipartisan support shows the
importance in fixing the dam.
Hundreds of studies on nature-based solutions to extreme events
show that “green infrastructure” is often cheaper and more
effective than engineered projects like dams, levees and sea
walls, according to a new analysis. Experts say federal and
state governments should heed those findings and increase
funding for natural landscapes and systems to reduce climate
disaster risk. Solutions include floodplain restoration and
“living shorelines” along vulnerable coasts and rivers.
USGS spokesman Paul Laustsen said the May 21 incident along
Pilarcitos Creek was just the most recent vandalism of the Half
Moon Bay stream gage. The vandalism only stopped the flow of
data for two days; the gage has since been replaced. He said
equipment vandalism is a big prob-lem for the agency all across
Three months after federal dam safety regulators ordered
Anderson Reservoir, the largest reservoir in Santa Clara
County, to be drained due to earthquake concerns, new details
are emerging on what will happen to all that water, the fish
that depend on it, and the water supply for Silicon Valley.
Grimes and Knights Landing are among three projects that have
been selected to receive grant funding under the second phase
of the Small Communities Flood Risk Reduction Program,
according to the California Department of Water Resources.
Construction will begin soon at Lake Success to increase flood
protection in the Porterville area by widening and reinforcing
Schafer Dam. On May 18, the U.S. Army Corps of Engineers
awarded a contract for up to $30 million to Central
Environmental Incorporated in Anchorage, Alaska to begin
In recognition of National Dam Safety Awareness Day, Andy
Mangney who serves as the Field Engineering Branch Chief
overseeing DSOD’s dam inspection and monitoring program, took
some time to answer questions about what DSOD is doing to
The likelihood of intense storms is rising rapidly in North
America, and the study, published Monday in the Proceedings of
the National Academy of Sciences, projects big increases in
such deluges. … If the current rate of warming continues,
Earth will heat up 5.4 degrees by 2100. Then, 20, 50 and
100-year extreme rainstorms could happen every 1.5 to 2.5
years, the researchers concluded.
In May, Cyclone Amphan made landfall in Bangladesh and eastern
India. The category 5 storm forced around 3 million people to
flee their homes. With this scenario in mind, a group of
disaster experts published guidelines for political leaders and
emergency managers so that they can prepare before the storms
U.S. policymakers understand quite well the impact of Mexico’s
wastewater management on American communities. What they fail
to comprehend is that the ongoing border sewage crisis is
rooted in a longer history of U.S. imperialism and private
enterprise in the San Diego-Tijuana region.
The proposals from the Bureau of Land Management would
eliminate a 15-day protest period afforded to the public to
comment on timber sales and other forest management decisions.
BLM said the comment period they are proposing to cut is
repetitive, as people can already submit their thoughts when a
project is undergoing review under the National Environmental
The water keeps rising, shrinking the window for implementing
solutions. Sea-level rise already threatens the bay shore,
which, at about 500 miles, is half the length of the entire
California coast. The worst is yet to come: The Bay Area needs
to plan for a 2-foot rise by 2050 and up to 7 feet by 2100.
The term “crisis on the border” typically refers to immigration
issues or drugs being smuggled into the country. But it has one
more meaning, as we discovered, when we went to the border in
early February: tens of millions of gallons of raw sewage that
spill every year into the Tijuana River on the Mexican side and
flow across the border right into Southern California,
polluting the land, air, and sea.
The 2008 financial market crash was called a “black swan” event
— an extreme catastrophic event that was not anticipated. We
hope that when a catastrophic dam failure occurs in the United
States it will not be called a black swan, since there is
already strong evidence that the combination of aging and
poorly maintained infrastructure and climate extremes could be
This network has been built up over 20+ years during several
epochs, including most recently in support of Forecast-Informed
Reservoir Operations with USACE and Sonoma Water, and with an
eye toward developing knowledge of what observations would be
needed in the future to support California’s needs for
hydrometeorological information related to drought and flood
monitoring and mitigation across the state.
As part of an effort to modernize Pyramid Dam located in Los
Angeles County, the Department of Water Resources (DWR)
recently completed assessments for the dam’s gated and
emergency spillways. The Pyramid Dam Modernization Program is
now entering the investigations phase, which includes
structural and hydraulic analyses for the gated spillway and
erodibility analysis for the emergency spillway.
In 2014, the Cleveland National Forest (CNF) initiated an
effort to restore the migratory corridors for fish and other
aquatic species in the San Juan and Santiago Watersheds by
removing the remnants of small (approximately 2 – 15 ft) dams
constructed by Orange County (California) between 1940-70s.
It was during the drought in the late-1980s that Robin Kulakow
and her fellow birdwatchers began noticing that Putah Creek was
running dry. The same observation was being made at places such
as Camp Davis, a popular site near the university where youth
paddled their canoes and participated in other activities.
More than 15,000 dams in the US would likely kill people if
they failed, and at least 2,300 of them are in poor or
unsatisfactory condition, according to recent data from the
federal government’s National Inventory of Dams.
No one can say yet whether the intense rainfall that preceded
this disaster [in central Michigan] was made worse by climate
change. But global warming is already causing some regions to
become wetter, and increasing the frequency of extreme storms,
according to the latest National Climate Assessment. … That
puts more of the nation’s 91,500 dams at risk of failing,
engineers and dam safety experts said.
To address the challenges atmospheric rivers present, the
Center for Western Weather and Water Extremes (CW3E) was
established at the Scripps Institute of Oceanography to advance
scientific understanding of atmospheric rivers and their role
in extreme events and to improve forecasting capabilities.
Earlier this year, a webinar hosted by the Scripps Corporate
Alliance highlighted the Center’s accomplishments.
Over the past six months, scientists have been flying high over
the Pacific Ocean, into the stratosphere to study weather
phenomena called atmospheric rivers. These rivers in the sky
can deliver huge amounts of rain and snow to the west coast.
And they may be getting more intense. NPR’s Nathan Rott joined
them for a flight.
The agreement between property owners, nonprofits and multiple
governmental agencies outlines a plan to remove the weir, or
low wooden dam at the mouth of the lagoon, and excavate the
entire 220-acre preserve to restore tidal flushing. … Without
intervention, the lagoon would continue to fill with sediment
and vegetation until it eventually disappears.
For decades, sediment buildup in California’s Butano Creek
caused an array of issues for both fish and people. It flooded
roads and local communities, prevented steelhead and coho
salmon from migrating, and contributed to substantial die-offs
of fish. In October 2019, the NOAA Restoration Center and
partners finished a $7 million effort to remove the sediment
and restore the creek.
The Three Rivers Levee Improvement Authority plans to finish a
levee improvement program at the Goldfields later this year
that has been in the making since 2004 and will have cost
approximately $500 million once all is said and done.
Like an undulating seesaw, weather in some regions swings from
drought to heavy rain under the weight of climate-induced
changes, a new study finds. The analysis, published in
Geophysical Research Letters, finds a link between droughts
followed by heavy rain events, along with an increased rate of
these successive extreme weather occurrences.
California has a paradoxical history with its environment. On
one hand, the state boasts incredible natural beauty, along
with a government that is an internationally recognized leader
for strong environmental policies. But the state’s residents
have also caused severe environmental destruction, particularly
in the late nineteenth century — some of which helped spur the
mobilization that led to these environmental successes.
The 2017 Central Valley Flood Protection Plan’s Investment
Strategy looked at … retooling the Sacramento-San Joaquin
Drainage District to provide a small continuous funding stream
for ongoing expenditures of the flood management system. At the
April meeting of the Central Valley Flood Protection Board,
consultants discussed the upcoming feasibility study.
The U.S. Environmental Protection Agency has proposed spending
$300 million to address the problem of toxic sewage flowing
across the border into San Diego County, legislators announced
Tuesday. The money would be part of the United
States-Mexico-Canada Agreement Implementation Act, and will be
used for the engineering, planning, design and construction of
wastewater infrastructure at the border, officials said.
A strange thing happens during particularly wet winters in
California: farmers flood their fields. … Aquifers are the
last line of defense against drought conditions. By flooding
their fields in January, farmers hope to fill these underground
reservoirs with water they can use in August. If a trio of
recent studies prove accurate, one can expect to see this
method deployed more regularly.
Being born from an engineering miscalculation on the part of
the California Development Company means the Salton Sea has
been written off as an “accident” in histories inked on many
pages, ranging from The Washington Post to the Daily Mail. But
that framing is too simplistic, new research suggests, arguing
that the sea’s formation was inevitable, regardless of the
famous canal breach in 1905.
The USDA’s Natural Resources Conservation Service announced
today the availability of up to $5 million for wetland
mitigation banks. This funding through the Wetland Mitigation
Banking Program is available to help conservation partners
develop or establish mitigation banks to help agricultural
producers maintain eligibility for USDA programs.
Rather than soaking into the ground, the water is swept quickly
into rivers and streams where it increases flood hazards. But
how much of a hazard are these impervious surfaces? A new study
has estimated the size of the effect. For every additional
percentage point of impervious surface in a watershed — going
from 5 percent coverage to 6 percent coverage, for instance —
the peak of the highest flood flow of the year increases by 3.3
A long awaited $74 million project to enlarge the Success
Reservoir will expand water storage along the Tule River from
82,000 to 110,000 acre feet and provide additional flood
protection for residents of Porterville and surrounding
The U.S. Department of Interior started a water experiment
along the Colorado Friday, May 1, at the Glen Canyon Dam,
located near Page Arizona. The experiment is meant to improve
the egg-laying conditions for insects that live at least some
part of their lives in the water, which are the primary food
source for endangered Colorado River fish as well as native
On a recent sunny, windy March day – just before COVID-19 sent
the [San Francisco] Bay Area into lockdown – Dave Halsing stood
on the trails at Eden Landing Ecological Reserve and
pointed out what used to be old industrial salt ponds. He noted
how they’re gradually being restored into a rich mosaic of
tidal wetlands and other ecosystems in the South Bay Salt Pond
Dr. Laurel Larsen, an expert in hydroecology, landscape
dynamics, complex environmental systems, and environmental
restoration, was unanimously appointed by the Delta Stewardship
Council on Thursday as lead scientist. Most recently, Dr.
Larsen has served as an associate professor in the Department
of Geography and Civil and Environmental Engineering at the UC
To prevent flooding and manage water levels in a Sonoma creek,
a pond leveler will be installed where a family of beavers is
living, Sonoma County Water Agency officials said. The pond
leveler will help water transfer through the beaver dam so that
the pond doesn’t cause flooding. It will also assist with
maintaining the habitat for the beavers…
The Department of Water Resources announced $7 million in
grants to restore streams, creeks, and rivers to more natural
environmental conditions and reduce flood damage risks across
multiple communities in California.
Just days before Covid-19 spurred a vast quarantine-at-home in
California, a crew of workers in downtown Oakland was busily
planting dozens of potted grasses, shrubs and trees in a newly
sculpted garden bed in what had been a gutter and a row of
parking stalls a block from City Hall.
When the Water Forum Agreement was officially signed 20 years
ago, the occasion marked an unprecedented show of regional
cooperation. For years, interests representing business, the
environment, water suppliers and others had sparred over the
water needs of people vs. the environment of the lower American
Pacific Gas and Electric Company (PG&E) announced that it
will be upgrading the Lower Bucks Lake Dam this year by
attaching a waterproof membrane to the upstream surface of the
dam to prevent seepage and extend the dam’s service life.
Lewis MacAdams, a poet and crusader for restoring the concrete
Los Angeles River to a more natural state and co-founder of one
of the most influential conservation organizations in
California, has died. He was 75.
Although it is clear that river discharge is the major source
of plastic pollution entering the oceans, there remains
uncertainty around how plastic pollution is transported through
rivers and coastal marine waters. How important is stormflow
for delivering plastic pollution from rivers to the coastal
ocean? How are microplastics transported through coastal
environments? How much is eventually sinking and settling on
It has been 30 years since the last time a dam was seriously
considered on the East Fork [of the Carson River] as a means to
reduce flooding and increase water for agriculture and other
uses. … The East Fork begins near the base of Sonora Peak in
California. The river’s upper gorge was carved out by a 16-mile
glacier coming off the 11,500-foot high mountain. It is one of
only two major free-flowing rivers in the Eastern Sierra.
Yolo Basin Foundation’s Board of Directors announced this week
that Chelsea Martinez has been named the Foundation’s new
executive director. … Martinez joined the Foundation in 2017
as the Community Outreach & Volunteer Coordinator and has grown
and sustained the Foundation’s volunteer base to over 200
volunteers as well as helped to increase community involvement
in its programs.
In the past decade, environmental groups have had success
bringing back patches of life in parts of the river delta. In
these green islands surrounded by the desert, water delivered
by canals and pumps is helping to nourish wetlands and forests.
Cottonwoods and willows have been growing rapidly. Birds have
been coming back and are singing in the trees.
A new study in Nature Scientific Reports says the possibility
of extreme flooding along U.S. Coastlines is going to double
every five years, and that dangerously high water levels we now
expect to see every 50 years will become: Annual occurrences by
2050; Daily occurrences by 2100.
Kristin Sicke is Assistant General Manager for Yolo County
Flood Control and Water Conservation District, which manages
water supplies for 200,000 acres in western Yolo County, which
encompasses Woodland, Davis, and the surrounding area. In this
presentation from the 2019 Western Groundwater Congress, Ms.
Sicke describes the district’s efforts to use winter stormwater
flows for groundwater recharge in the Yolo subbasin.
How critical are Sacramento Valley floodplains for a vibrant
fishery? A California Fish and Game Bulletin from 1930 gives us
a clue. The report documents the Sacramento River commercial
salmon catch declining from 6 million pounds in 1918 to less
than 1 million pounds by 1927.
Without the river, there would not have been an Emigrant Trail
through this site, gold would not have been discovered in
Dayton and who knows when the Comstock Lode would have been
discovered and Nevada might not even be Nevada today!
Led by the San Francisco Bay Conservation and Development
Commission, the report takes study findings from throughout the
region to demonstrate the shared impacts of sea level rise
ranging from 12 to 108 inches on housing, transportation
networks, critical environmental habitat, jobs and
Since March 10, the weather station on the University of
Southern California’s campus has seen just under seven inches
of rain, or nearly half of all taken in for the entire water
year. If that sounds like a lot for March and April, it is.
According to historic norms, the average rainfall during those
two months is 3.34 inches.
In the fall of 2018, a six-member independent Social Science
Task Force was charged by the Delta Stewardship Council’s Delta
Science Program to develop a strategy for strengthening and
integrating social sciences into the science, management, and
policy landscape of the Sacramento-San Joaquin Delta. This
document summarizes the findings and recommendations of the
It’s a simple rule, designed to protect both homeowners and
taxpayers: If you want publicly subsidized flood insurance, you
can’t build a home that’s likely to flood. But local
governments around the country, which are responsible for
enforcing the rule, have flouted the requirements, accounting
for as many as a quarter-million insurance policies in
violation, according to data provided to The New York Times by
the Federal Emergency Management Agency…
When modeling the El Niño-Southern Oscillation (ENSO)
ocean-climate cycle, adding satellite sea surface salinity — or
saltiness — data significantly improves model accuracy,
according to a new NASA study.
A slow-moving storm system will bring more rain and mountain
snow to parts of California through Thursday, and could trigger
flash flooding in the Mojave Desert, including some of
America’s typically driest places.
Los Angeles County can move forward on plans to develop 2,000
acres along the Santa Clara River without conducting a new
assessment of the project’s impact on local water supply, a
California appeals court ruled.
The Los Angeles River is special to Ed Reyes, who considers it
an integral part of his childhood. Reyes, 60, the executive
director of River LA and a former Los Angeles City councilman,
grew up about a half-mile from the river. He remembers playing
chicken with the rail cars and using his Stingray bike to dodge
the cars coming and going.
Today, as the chief of dam safety services within the Division
of Operations and Maintenance (O&M) of California’s
Department of Water Resources (DWR), David Sarkisian guides a
team of 25 engineers that monitors, surveils, inspects and
guides the on-going maintenance of the 26 dams and reservoirs
within the California State Water Project (SWP), many of which
are more than 50 years old.
Two 30-inch outlet pipes in the dam had been plugged with
debris since last spring, forcing the lake to rise and wash
over a spillway that state officials have deemed unsafe. But by
early February, water was again flowing out of the pipes,
allowing the lake to drop to a safe level, according to a
Shasta County Sheriff’s Office report.
A 48-inch increase in the bay’s water level in coming decades
could cause more than 100,000 Bay Area jobs to be relocated.
Nearly 30,000 lower-income residents might be displaced, and
68,000 acres of ecologically valuable shoreline habitat could
be lost. These are among the findings in the most detailed
study yet on how sea level rise could alter the Bay Area.
The $100 million Creek District project will improve streets,
add bridges and build a new park in the area adjacent to San
Marcos Creek, which goes through seasonal flooding during
rains. The Creek District project represents a milestone for
the city, which has struggled with annual flooding that has
limited access to the neighborhood during storms.
The Bureau of Reclamation and the California Department of
Water Resources are conducting exploratory work, including
clearing, excavation and controlled blasting of rock material
in the Basalt Hill area near B.F. Sisk Dam, located between Los
Banos and Gilroy, between 6 a.m. to 8 p.m. during April and
May. The exploratory findings on Reclamation lands will help
identify size and quality of granular material for the planned
Safety of Dams Modification project.
In March 2020 the most substantial review article to date
focusing on atmospheric rivers (AR) was published in the first
volume of the new journal Nature Reviews: Earth and
Environment. The article, led by Ashley Payne (Univ. of
Michigan) focuses on climate change dimensions, and was
prepared by an international group of scientists…
This year marks a significant milestone for the Interagency
Ecological Program (IEP) – now nine state and federal agencies
that first joined forces 50 years ago for cooperative
ecological monitoring and coordination in the Sacramento-San
Joaquin Delta and San Francisco Bay Estuary. As the IEP Lead
Scientist, I have been reflecting on who we are, how we’ve
evolved, and what we need to do to ensure we’re still working
collaboratively for another 50 years.
Kolster’s latest book, L.A. River (GFT Publishing, 2019),
contains a series of images of the fifty-one-mile body of water
at various stages, from its headwaters in Canoga Park through
California’s biggest city to Long Beach, where it meets the
Pacific Ocean. For this project, Kolster used a
nineteenth-century photographic technique called the wet plate
collodion process, to striking effect.
In February 2017, damage to the Oroville Dam’s spillways
prompted the evacuation of more than 180,000 people living
downstream along the Feather River. The raging muddy waters
also triggered an emergency decision to relocate millions of
young salmon from the Feather River Hatchery to the Thermalito
Annex Hatchery to be raised and held until river water
conditions improved. … Those fish survived and were later
released to the wild – helping fuel a record class salmon
harvest in the ocean two years later.
While studies attributing flood events to individual drivers
can be valuable, ignoring interdependencies among these drivers
as well as the effects of changing river morphology implicitly
promotes simplified views of the challenges inherent to flood
management. Further research must account for these
California’s homeless crisis is one of the state’s top issues,
but the least discussed aspect of this broad problem is the
damage these homeless encampments cause to our levees. …
Large trenches dug into the side of levees impact the integrity
and stability of our protective barriers that are engineered to
keep our homes and community from flooding.
For decades, the discussion over flood mitigation in Petaluma
has almost exclusively centered around storm surges and heavy
rainfall events. Now, months after the city made its landmark
climate emergency proclamation, attention is shifting to focus
more on sea level rise and scientific projections that offer a
glimpse into what could be a sodden future.
Historically, we’ve always been able to predict these extremes
by looking at how often they occurred in the past. But a new
study published Wednesday in Science Advances reveals just how
many of those forecasts actually fall short. In just a decade,
the findings suggest, the climate has shifted so drastically
that the frequency of past extreme events is no longer a
Paul Detjens is driving us from his Martinez office to a
restoration site near the mouth of Walnut Creek on Suisun Bay,
a project he spearheads as an engineer for the Contra Costa
County Flood Control District. … The closer we get to our
destination, however, the more industrial the landscape
becomes, and the more improbable it seems that we’re in the
right place to realize this vision.
Cindy Messer considers one of her greatest professional
accomplishments also the toughest experience in her 23-year
career. Messer was sworn in as chief deputy director of the
California Department of Water Resources the day after the
Oroville Dam crisis began in February 2017… But within
months, her boss retired, and she became acting interim
director for the recovery phase.
There is now plenty of evidence that as the atmosphere warms,
the planet is experiencing more wildfires. … Understandably,
much of the media surrounding these incidents focuses on the
immediate damage to forests, homes, people and wildlife, but
one potentially dangerous long-term impact has received less
attention – the effect of fires on water.
Now, Big Ag and the water agencies that do its water will want
to also divert streamflow during the winter wet season. For
folks who believe that any water “diverted” to the ocean is
wasted water, winter storm and snow-melt high flows have become
On March 12, 1928, three minutes before midnight, the dam broke
and sent a wall of water down San Francisquito Canyon through
Castaic Junction, Santa Clarita, Piru, Camulos, Bardsdale,
Fillmore, Santa Paula and Ventura before emptying into the
Pacific Ocean between Oxnard and Ventura. The dam collapse
created a 55-mile path of death and destruction, costing
millions of dollars and destroying many homes and other
Already a well-regarded landscape and portrait photographer,
Bay set out to bring more attention to the issue. The avid
surfer admits that he initially wasn’t sure how best to convey
what he saw as an environmental emergency. Then, one day, he
says he was visiting the Tijuana River mouth and stumbled upon
The public release of this product, and the underlying research
supporting it, is part of a joint partnership between CW3E and
NASA JPL, sponsored by the California Department of Water
Resources, to improve the two-week to two-month lead time of
forecasts, known as subseasonal-to-seasonal (S2S) forecasts.
The aim of these improved forecasts of atmospheric rivers and
precipitation is to benefit western U.S. water resource
Recharge basins are becoming increasingly popular in
overdrafted regions in California, where water managers are
seeking solutions to balance groundwater supply and demand to
comply with the state’s Sustainable Groundwater Management Act
Much-needed snow will blanket California’s Sierra Nevada high
country this weekend into next week, bringing hope of a
“Miracle March” that could replenish vital, water-providing
snowpack after a record-dry February.
We’re getting better when it comes to the L.A. River. Ten years
ago, most of us didn’t even know that L.A. even had a river.
… It’s hit a few bumps along the way (including the 1936
Flood Control Act that channelized it with concrete walls) —
but now, you not only can get to the re-wilded parts of the Los
Angeles River, but you can get onto them, too (for a part of
Spurred by a recent change in federal flood zone maps and a
desire to prepare for rising seas, Foster City is in the
process of raising its levees by 1 to 7 feet. Residents voted
in 2018 to tax themselves in order to pay for the estimated $90
million upgrade. When the project breaks ground later this
year, the city of 35,000 people will vault to the forefront of
urban adaptation in the Bay Area to rising waters.
While the bulk of the $175 million goes toward addressing
seepage issues along San Joaquin River levees, a dry levee in
southwest Manteca plays a key role in making sure potential
breaks along the San Joaquin south of RD-17 or levee failures
on the Stanislaus River don’t flood portions of either city.
The federal government is giving local officials nationwide a
painful choice: Agree to use eminent domain to force people out
of flood-prone homes, or forfeit a shot at federal money they
need to combat climate change.
State and federal leaders came together to tour the Salton Sea
and understand the impending health issues the public continues
to face. NBC Palm Springs joined officials to get a glimpse of
what is being done to help restore an area that was once a
relaxing summer destination.
As the waters of Lake Mead have risen and fallen over the
years, the remains of the village of St. Thomas have
reappeared, then disappeared again, only to re-emerge years
later. It’s a sort of Brigadoon for the southwestern United
The storm— fed by a plume of subtropical water vapor at the
lower and middle levels of the atmosphere — could bring 1 to 3
inches of rain to the area through at least Wednesday. … The
heaviest rain is expected throughout Tuesday, upping the
chances for both an ugly morning and evening commute.
State and federal leaders came together to tour the Salton Sea
and understand the impending health issues the public continues
to face. NBC Palm Springs joined officials to get a glimpse of
what is being done to help restore an area that was once a
relaxing summer destination.
U.S. Rep. Grace Napolitano has convinced the U.S. Army Corps of
Engineers to spend $393.2 million to fix the Whittier Narrows
Dam, but she still has to persuade Congress to appropriate the
money. With other congressional members at her side on Friday,
Napolitano, D-El Monte, began her effort with a tour of the dam
near Lincoln Avenue in Montebello.
We expect most of Southern California, including the Los
Angeles Basin and San Diego metro area, as well as parts of
Arizona, to pick up at least an inch of rain through Thursday.
Some heavier amounts in higher terrain on southern- and
southwestern-facing slopes are possible. Flash flooding of
flood-prone, low-lying streets, freeways and normally dry
washes and arroyos is possible in some areas.
As sea levels rise, so do the waters in the bay, which connects
to the Pacific Ocean through the Golden Gate. That relationship
between rising ocean levels and rising bay levels is well
known. What is less obvious is that groundwater levels are
rising as well, adding another variable to the region’s
equation of increasing flood risk.
The South Bay Salt Pond Restoration Project is the largest
tidal wetland restoration project on the West Coast. When
complete, the Project will restore 15,100 acres of industrial
salt ponds to a rich mosaic of tidal wetlands and other
habitats. The Project is intended to restore and enhance
wetlands in South San Francisco Bay while providing for flood
management, wildlife-oriented public access, and recreation.
The U.S. Army Corps of Engineers Sacramento District awarded a
$64 million construction contract on February 14 … for nearly
three miles of levee improvements along the Sacramento River
East Levee. This project will kick off major construction in
the region to complete approximately $1.5 billion of work to
upgrade levees along the American and Sacramento Rivers as well
as widening the Sacramento Weir and Bypass.
Valley Water in Santa Clara, Calif., doesn’t fully agree with a
Feb. 20 directive from the Federal Energy Regulatory Commission
(FERC) to drain its Anderson Dam as the water district waits to
begin upgrades to the structure near the Calaveras Fault.
The islands of the western
Sacramento-San Joaquin Delta are sinking as the rich peat soil
that attracted generations of farmers dries out and decays. As
the peat decomposes, it releases tons of carbon dioxide – a
greenhouse gas – into the atmosphere. As the islands sink, the
levees that protect them are at increasing risk of failure, which
could imperil California’s vital water conveyance system.
An ambitious plan now in the works could halt the decay,
sequester the carbon and potentially reverse the sinking.
A federal order to drain Silicon Valley’s largest drinking
water reservoir has thrown the region into disarray, with
multiple agencies pointing fingers at each other and some local
leaders fearful their cities could run out of water, not this
summer but the following one.
For years, city auditors warned elected leaders that San
Diego’s stormwater needs were being dramatically underfunded,
leaving the city vulnerable to lawsuits and hefty fines from
state regulators. Still, the mayor’s office has yet to take on
the political challenge of securing enough new funding to fix
the situation, something that would likely require a
voter-approved tax hike.
A Simon Fraser University-led research team has found
significant evidence that human activity in estuaries is
impacting juvenile Pacific and Atlantic salmon. The team’s
review of 167 peer-reviewed studies (from an initial search of
13,000) identified negative impacts from several stressors,
including the effects of flood-protecting tidal gates,
pollution and habitat modification.
California’s coast is truly a treasure for residents and
visitors alike. Sadly, rising seas are washing away our beach,
and for every inch of sand lost, our opportunities for joy —
and our economic future — similarly shrink.
At a time when Del Mar, Pacifica and other coastal cities are
fighting to defend their homes and roads from the rising sea,
Marina has embarked on a path less traveled. Here in this Army
turned university town, residents are learning how to adjust
with the ocean as the water moves inland.
The San Francisco Bay Conservation and Development Commission
has created an online mapping tool known as the Bay Shoreline
Flood Explorer that allows you to see the impacts of rising
oceans if precautions aren’t taken. You can see how much of the
shoreline is inundated at 12 to 144 inches of rise, as well as
the impacts of storm surges and exceptionally high tides that
can temporarily cause water levels to rise.
The state Department of Water Resources said Thursday the
Federal Emergency Management Agency agreed to cover
approximately $300 million in repair costs the agency had
previously denied. … All told, the state now expects to be
reimbursed for approximately $750 million of the $1.1 billion
cost of the crisis…
By 2030, the projected sea level combined with a particularly
nasty storm event could flood nearly everything west of Highway
1 in Stinson Beach: 590 parcels, 430 buildings and several
miles of road. By the middle of the century, every high tide
will bring flooding, and the roadways will likely need to be
altered to maintain access to the low-lying town.
An investigation by NBC Bay Area has found more than two dozen
major construction projects worth billions of dollars – either
recently completed or still in development or – located in
areas along San Francisco Bay that scientific computer models
show will be flooded or surrounded by water by 2050 or earlier.
The Colusa Groundwater Authority, the California Department of
Water Resources and The Nature Conservancy have partnered to
conduct an on-farm, multi-benefit demonstration program for
growers in two select project locations around Colusa County.
The town of Fairfield is moving forward with a project to
better protect its wastewater treatment plant from large storms
and sea level rise. According to a press release from First
Selectwoman Brenda Kupchick, the project will cost a total of
$7.4 million but $3.33 million will be funded through a grant
from the United States Department of Housing and Urban
Developments’ (US HUD) Community Development Block Grant -
A long-planned Pajaro River flooding prevention project has
secured its first federal funding for engineering and design.
Earlier this week, Rep. Jimmy Panetta announced that the Pajaro
River Flood Risk Reduction Project had been provided $1.8
million from the U.S. Army Corps of Engineers 2020 work plan
Local reservoirs and municipal water supplies might become so
polluted from the fires that the current water supply
infrastructure will be challenged or could no longer treat the
water. … But most of the fire-prone areas in North America
lack large-scale vulnerability assessments of their municipal
Partnering with the state of California and the Sacramento Area
Flood Control Agency, the Army Corps of Engineers is overseeing
a $383 million project to raise the height of Folsom Dam. At a
site along Folsom Lake, Rocklin-based Odin Construction
Solutions is tackling the first phase of that effort, raising
what’s known as Dike 8.
Recently, the Department of Water Resources launched a new
safety initiative called Headwaters to Floodplains, which
applies an integrated regional watershed management approach to
the realm of flood management. … At the January meeting of
the California Water Commission, Mike Mierzwa from DWR’s Office
of Floodplain Management briefed the Commission members on the
Two sprawling metropolitan areas offer a glimpse of the future.
One rich, one poor, they sit on opposite sides of the Pacific
Ocean: the San Francisco Bay Area (population 7 million) and
metropolitan Manila (almost 14 million). Their history, their
wealth, and the political and personal choices they make today
will shape how they fare as the water inevitably comes to their
More than $188 million in flood risk management work for
Northern California were outlined in two separate budget
releases on February 10, adding to an already robust Sacramento
District workload. … Continued upgrades to Natomas Basin
levees leads the way with $131.5 million.
More than dust-filled air could be plaguing residents around
the quickly evaporating Salton Sea in Imperial Valley.
University of California, Riverside research shows toxic
aerosols could also be filling the air. The problem has to do
with agricultural fertilizer in the Salton Sea wetland area.
Wildfires can have many detrimental impacts on water supplies.
The effects can last for multiple decades and include drinking
water pollution, reservoir sedimentation, flash floods and
reduced recreational benefits from rivers. These impacts
represent a growing hazard as populations expand, and
communities encroach onto forest landscapes.
The fate of Foster City and the rest of the Bay Area was front
and center last week as state lawmakers grappled with the many
threats California must confront as the ocean pushes farther
inland. A special committee of state lawmakers gathered — for
the second time in two months after years without meeting — to
reignite a much-needed discussion on how to better prepare
communities up and down the coast…
The group called Water Audit California has used lawsuits to
pry water releases from local reservoirs for fish and has
threatened a groundwater-related lawsuit against Napa County.
The group last week co-sponsored a forum to suggest another
To adequately prepare for the impacts of sea level rise,
regional collaboration must be enhanced and a considerable
investment by the state is needed and soon, according to the
experts and officials who spoke at a hearing on sea level rise
Friday in Foster City.
Climate change is spurring a new, deep dive into a complex,
little-studied weather system blamed for creating billions of
dollars in flood damage across the western U.S. Atmospheric
rivers are narrow ribbons of concentrated moisture that
originate in the Pacific and can flow thousands of miles before
dropping rain and snow on land.
Like last year, the White House wants to cut all non-defense
discretionary spending by 5%. Non-nuclear spending at the
Department of Energy would be cut 29%, EPA would be reduced by
27%, the Army Corps of Engineers would drop 22% and the
Interior Department would fall by 13%.
This means that the numbers used for the three gages in Tehama
County have different levels for what is considered flood
monitor stage when there is the possibility of flooding, as
well as the level that is considered to be flood stage, said
Cindy Matthews, a senior service hydrologist with the National