Keywords:flood management, infrastructure, storage
INTERA Incorporated (INTERA) was retained by the Calleguas Municipal Water District (CMWD) to develop a numerical groundwater model of the East Las Posas...
INTERA Incorporated (INTERA) was retained by the Calleguas Municipal Water District (CMWD) to develop a numerical groundwater model of the East Las Posas Management Area (ELPMA), which includes the locally-recognized east and south sub-basins of the Las Posas Valley Basin (LPVB). Groundwater in the ELPMA is found in a multiple-aquifer system characterized by intense faulting and folding, which is known to exert structural controls on groundwater flow and movement. The ELPMA is known to receive recharge from surface water flows in Arroyo Las Posas/Simi that runs east to west along the southern edge of the basin. Flows in the Arroyo have become perennial as a result of discharges from wastewater treatment plants and dewatering wells within and upstream of the ELPMA. Hence, understanding and modeling the surface-water/groundwater interaction along the Arroyo is an important component of the numerical model development. CMWD also owns and operates the Las Posas Basin Aquifer Storage and Recovery (ASR) Project, consisting of eighteen high capacity ASR wells and associated facilities located in the ELPMA that are used to inject and recover potable water purchased from Metropolitan Water District of Southern California (Metropolitan). Basin response to injection/extractions at the ASR well fields and the evaluation of storage capacity of the ASR well field are key considerations for this modeling project.
An extensive storage system plays a critical role in the state’s water management. This brief describes a number of ways to improve the...
An extensive storage system plays a critical role in the state’s water management. This brief describes a number of ways to improve the management of reservoirs and groundwater basins to better prepare for droughts and manage floods.
This publication is part of a briefing kit that summarizes a dozen of the state’s most pressing water management issues.
Achieving a more effective and flexible water storage system requires a shift in the way that we, as a society, understand, define, and...
Achieving a more effective and flexible water storage system requires a shift in the way that we, as a society, understand, define, and use storage as an element of integrated water management. Broadening our view of what constitutes a storage reservoir must be accompanied by a shift in our policies and programs to support a “retention” approach to storage—one that holds as much water as possible in the landscape for later use, while maintaining healthy ecosystems.
To be more resilient and better prepared for future variations in water supply, California must take advantage of all storage opportunities throughout the system that meet the goals of reliable water supply and ecosystem restoration.
Several valuable aspects of water storage tend to be overlooked in terms of their ability to contribute to the availability and reliability of water supplies for uses that benefit society.
In particular, California’s agricultural lands play an important role in the storage infrastructure. The value of working lands in helping to sequester water for later use while achieving many benefits, such as food security, flood management and habitat restoration, represents a critical missed opportunity for improving water security.
Four key principles must guide efforts to ensure effective water retention in the future:
1. Storage integrates all hydrological components affecting water availability, movement, and retention to improve supply reliability statewide for evolving needs.
2. Comprehensive, timely, accurate, accessible, and transparent data and resulting information about our water resources is an essential foundation for effectively managing water storage in California.
3. An effective storage system requires the coordination of policies and regulations, activities, oversight, and accountability of all government agencies to meet local, regional, and statewide needs simultaneously.
4. Water storage and retention for improved water supply reliability and watershed health is facilitated by the availability of new sources of financial support that allow investment in quantified outcomes.
Improving the flow of information through coordinated data management and institutional coordination can lead to powerful water retention outcomes. Several new and innovative funding mechanisms can complement traditional funding streams for water retention and are particularly well suited to agricultural applications.
California’s vast reservoir system, fed by annual snow and rainfall, plays an important part in providing water to the State’s human and wildlife...
California’s vast reservoir system, fed by annual snow and rainfall, plays an important part in providing water to the State’s human and wildlife population. There are almost 1,300 reservoirs throughout the State, but only approximately 200 of them are considered storage reservoirs, and many of the larger ones are critical components of the Federal Central Valley Project and California State Water Project. Storage reservoirs, such as the ones shown in figure 1, capture winter precipitation for use in California’s dry summer months.
In addition to engineered reservoir storage, California also depends on water “stored” in the statewide snowpack, which slowly melts during the course of the summer, to augment the State’s water supply.