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Updated: 2 hours 22 min ago

Reconciling conservation and human use in the Delta

February 12, 2017 - 7:00pm
By John Durand, Peter Moyle, and Amber Manfree  In a previous blog, we presented a Grand Scheme for habitat conservation in the North Delta Arc (the Arc). This follows up on our earlier broad vision for recreating a Delta more friendly … Continue reading →

California’s Wettest Drought? – 2017

February 5, 2017 - 7:20pm
By Jay Lund Wet.  After five years of drought, most of California finally has become wet.  The mountains are exceptionally wet and covered with snow.  The state’s reservoirs are fuller than their long term average (with a few exceptions).  Flood … Continue reading →

Episode 3: “Unraveling the Knot” Water Movement in the Sacramento-San Joaquin Delta – Managing Flows

January 29, 2017 - 7:00pm
By William Fleenor, Amber Manfree, and Megan Nguyen Delta water diversions have significant effects on flows and water quality within the Delta. Diversions can re-direct river flows and draw salt water inland from the sea, impacting water quality and the … Continue reading →

Episode 2: “Unraveling the Knot” Water Movement in the Sacramento-San Joaquin Delta – Tidal Forces

January 25, 2017 - 5:00am
By William Fleenor, Amber Manfree, and Megan Nguyen Tides are the biggest driver of Delta flows, and in Episode 2 we look at their impacts in different locations under a variety of inflow conditions.  Tides have a twice-daily cycle in … Continue reading →

Episode 1: “Unraveling the Knot” Water movement in the Sacramento-San Joaquin Delta

January 22, 2017 - 7:00pm
By Bill Fleenor, Amber Manfree, and Megan Nguyen In 2010, John DeGeorge of RMA, Inc used animated model results to illustrate specific flow and water quality issues in the Delta to the State Water Board. The Center for Watershed Sciences, … Continue reading →

Indicators of a drought ending in northern California

January 15, 2017 - 8:53pm
Jay Lund Droughts are common in California, a large, generally dry, and hydrologically complex place.  So it is hard to rely on a single index of the end or beginning of a drought.  A single storm is rarely enough to … Continue reading →

Tails of California’s Drought

January 10, 2017 - 9:39pm
by Jay Lund Storms are filling reservoirs, building snowpack, and flooding in ways not seen since the most recent California drought began in 2012.  The state’s reservoirs today contain 1.2 million acre-ft more water than the long-term average for this … Continue reading →

Out With the Old Drought and In With the New?

December 28, 2016 - 7:29am
By Jay Lund We are just a few months into this year’s wet season, and progress has been great.  Statewide, California is about 800,000 acre ft below average surface water storage for this time of year.  California’s water year began … Continue reading →

Shadow theater and data management for the Delta – a video

December 20, 2016 - 6:00am
By Amber Manfree Data and data management are persistent concerns for the Delta and California water more generally. Data Wars: A New Hope, a shadow puppet play on the subject, was shown at the 2016 Bay-Delta Science Conference in Sacramento. … Continue reading →

California, Flood Risk, and the National Flood Insurance Program

December 14, 2016 - 6:00am
by Nicholas Pinter, Rui Hui, and Kathy Schaefer Across the US and worldwide, flooding is the deadliest and most costly natural disaster.  The US National Flood Insurance Program (NFIP) is an imperfect framework for reducing flood losses, but currently the … Continue reading →

How engineers see the water glass in California

December 5, 2016 - 11:44am
How do engineers see the water glass in California? Mostly the same as they did four years ago when this blog was first posted, though with today’s drought the glass is perhaps down to a quarter full — or three-quarters empty.  … Continue reading →

The Coming Droughts of California in 2017 – November 27, 2016

November 27, 2016 - 6:01pm
By Jay Lund California is a big diverse place. California probably will experience droughts this year of different types in different places, and no drought at all in some places, simultaneously.  Even if conditions this year are very wet, with … Continue reading →

Human Use of Restored and Naturalized Delta Landscapes

November 20, 2016 - 7:00pm
By Brett Milligan, Assistant Professor, UC Davis Landscape Architecture and Sustainable Environmental Design and Alejo Kraus-Polk, PhD Geography candidate, UC Davis Current legislation and plans for the California Delta call for restoring tens of thousands of acres of aquatic and … Continue reading →

Allocating a Share of San Joaquin River Water to the Environment Shows Promise

November 14, 2016 - 7:00pm
By Jeffrey Mount, Brian Gray, Ellen Hanak, PPIC Water Policy Center, Peter Moyle, UC Davis Center for Watershed Sciences Introduction In September 2016, the State Water Board released its draft plan for new environmental flow requirements in the San Joaquin … Continue reading →

The North Delta Habitat Arc: an Ecosystem Strategy for Saving Fish

November 6, 2016 - 7:00pm
Peter Moyle, John Durand, Amber Manfree.  Center for Watershed Sciences, University of California, Davis. Delta native fishes are in desperate condition. Over 90% of fish sampled by diverse means belong to non-native species.  Native species such as delta smelt are … Continue reading →

The Horror of a Salmon’s Wheel of Misfortune

October 30, 2016 - 8:00pm
By Miranda Tilcock Salmon in the Stream 10 little salmon eggs, resting in a redd 1 was covered in silt, now the egg is dead 9 little alevin, with their yolks attached, 1 was washed away, and never made it … Continue reading →

Evaluating California’s Adjudicated Groundwater Basins in the SGMA Era

October 23, 2016 - 8:00pm
By Ruth Langridge, University of California – Santa Cruz [i] Groundwater is a critical resource in California. While the 2014 Sustainable Groundwater Management Act (SGMA) established new requirements and increased state oversight for many overdrafted basins,[ii] groundwater basins adjudicated before … Continue reading →

Water is for fighting over? – a review of John Fleck’s recent book

October 17, 2016 - 6:00pm
By Jay Lund Most expressions on Western water issues are reflex or studied advocacy favoring a single viewpoint or opposing other viewpoints.  A minority provide thoughtful and reasonably balanced insights.  John Fleck’s new book, “Water is for fighting over” is … Continue reading →

Comparing Delta Consumptive Use: Preliminary Results from a Blind Model Comparison

October 9, 2016 - 8:00pm
By Josué Medellín-Azuara, Kyaw Tha Paw U, Yufang Jin, Quinn Hart, Eric Kent, Jenae’ Clay, Andy Wong, Andrew Bell, Martha Anderson, Daniel Howes, Forrest Melton, Tariq Kadir, Morteza Orang, Michelle M. Leinfelder-Miles, J. Andres Morande, William Li, and Jay R. … Continue reading →

Drought Prospects in California for the New 2017 Water Year – October 1, 2016

October 3, 2016 - 8:42am
By Jay Lund Happy New Water Year 2017! Hopefully everyone has recovered from their celebrations. The 2016 drought year is over.  It was milder year than the four previous drought years.  The great wet hope of the “Godzilla” El Nino … Continue reading →