Tag: Drought

Comments on the Water Board’s draft urban conservation regulations

Tree in wet and dry landscape
~ Deirdre Des Jardins ~ Leave a comment

On Wednesday, October 4, 2023, the State Water Resources Control Board held a hearing on proposed regulations to implement 2018 legislation to make conservation a way of life in California. According to the Board's fact sheet: Making Conservation a California Way of Life is a new regulatory framework proposed by State Water Board staff that establishes … Continue reading Comments on the Water Board’s draft urban conservation regulations

The State Water Project Delivery Reliability Report may have created systemic drought vulnerability

~ Deirdre Des Jardins ~ 1 Comment

On June 7, 2022, Adel Hagekhalil, general manager of the Metropolitan Water District of Southern California, issued the following statement: We are in an unprecedented situation, where our water supplies from the State Water Project are so limited by drought and climate change that they do not meet demands. Southern Californians must decrease their water … Continue reading The State Water Project Delivery Reliability Report may have created systemic drought vulnerability

Models that forecast water that isn’t there hurt all beneficial uses

~ Deirdre Des Jardins ~ 1 Comment

Assemblymember Adam Gray has called for an audit of the Department of Water Resources and the State Water Resources Control Board, in part to answer the question, What happened in the Water Year 2021 (October 1, 2020 to September 30, 2021) to lead the state to miscalculate by some 700,000 acre-feet the amount of water … Continue reading Models that forecast water that isn’t there hurt all beneficial uses

On DWR’s water supply models and drought risks

~ Deirdre Des Jardins ~ 2 Comments

The Delta Independent Science Board has just released their draft Water Supply Reliability Review. We strongly agree with their recommendation on water supply system models: The next generation of state-sponsored water supply system models for reliability estimation should be built, updated, and evaluated by a broad consortium of state and federal agencies and external experts … Continue reading On DWR’s water supply models and drought risks

Consideration of climate change in the Delta tunnel project

~ Deirdre Des Jardins ~ 1 Comment

The Department of Water Resources will be holding a webinar on consideration of climate change for the Delta tunnel project on August 25, 2021.  The following discussion is from my testimony in 2016 for Part 1A of the WaterFix Water Right Change Petition hearing. It explains some key problems with the consideration of shifts in … Continue reading Consideration of climate change in the Delta tunnel project

The “greedy” strategy for SWP and CVP reservoir operations

~ Deirdre Des Jardins ~ 4 Comments

Current operations of the State Water Project and Central Valley Project reservoirs in the Sacramento Valley are an example of a greedy strategy.[1] Under the greedy strategy, the system operators export as much water as possible in any given year. The strategy results in maximum water deliveries in a given year, but with the risk … Continue reading The “greedy” strategy for SWP and CVP reservoir operations

The State Water Project was originally designed for a six year drought

Lake Oroville March 2021
~ Deirdre Des Jardins ~ 1 Comment

A 1983 Bulletin by the Department of Water Resources (Bulletin 160-83) [1] documents that Oroville reservoir was designed to provide long-term carryover storage and reliable water deliveries in case of a repeat of the 1928-1934 drought. The Department of Water Resources  proposed in the same Bulletin 160-83 to change State Water Project operations to take … Continue reading The State Water Project was originally designed for a six year drought