100-Year Flood – It’s All About Chance
Los Angeles Basin Study Summary Report$0.00 Bulk Download
Los Angeles Basin Study Summary ReportU.S. Bureau of Reclamation (USBR) | November 1, 2016...Summary
Changing demographics, climate change, and competing interests for available water supplies all present long-term risks to the stability and reliability of the region’s...
Changing demographics, climate change, and competing interests for available water supplies all present long-term risks to the stability and reliability of the region’s imported water. The region recognizes that today’s challenges require an integrated water resources management approach.
For decades, this region has operated and maintained one of the most effective flood control systems in the world that protects millions of people from the impacts of flooding in the region. This system sends much of the stormwater runoff into the ocean, water that historically recharged local groundwater basins, making this region even more dependent on imported water supplies. As regulatory pressure to clean up polluted stormwater runoff continues and imported water resources diminish, this local source of water supply is becoming more and more attractive (GLAC IRWMP 2014).
Many of the region’s water management agencies have studied and planned for increasing use of local recycled and graywater supplies, ocean and brackish desalination, developing more groundwater, and implementing improved water conservation initiatives to extend existing supplies. Additionally, social trends and concerns also drive the emphasis on the use of local water supplies.
However, the one major local resource that has not been studied in-depth is stormwater and its opportunities to optimize the reliability of local supplies.
To enhance the capabilities of the existing stormwater conservation infrastructure within the Los Angeles Basin, the LACFCD began to investigate long-term projected needs and future climate conditions within the region. Given that local groundwater plays such a vital role in the region’s water supply portfolio, detailed scientific, engineering, and economic analyses were conducted to identify strategies for enhancing stormwater capture for groundwater recharge.
The LA Basin Study examined the region’s water supplies and demand, and impacts from projected population growth and changing climate in the watersheds of the Los Angeles region. The objectives of the study were to:
• Use state-of-the-art climate change analysis to develop projections of future water supply and demands in the Basin.
• Analyze how the Basin’s existing water infrastructure and its operations will perform in the face of changing water realities.
• Develop and highlight opportunities to adapt to current and future water demands.
• Conduct a trade-off analysis of identified opportunities.
Concepts ranged from enhancing the existing stormwater capture system and modifying existing facilities (including those capturing runoff for groundwater recharge), to developing new structural and nonstructural concepts that could help resolve future water supply and flood risk issues.
This Summary Report presents highlights of the critical tasks associated with this Basin Study and the results and findings produced throughout this collaborative study effort.
Full study chapters and appendices:
Task 3: Climate Change Analysis
Task 3.2: Hydrologic Modeling Report
Task 3.2: Annual Hydrologic Results Workbook
Task 4: Existing Infrastructure Response & Operations Guidelines Analysis
Task 5: Task 5 - Infrastructure & Operations Concept Analysis
Task 6: Trade-off Analysis
Urban Level of Flood Protection Criteria$0.00 Bulk Download
Urban Level of Flood Protection CriteriaCalifornia Department of Water Resources (DWR) | November 12, 2013...Summary
The Urban Level of Flood Protection Criteria was developed in response to requirements from the Central Valley Flood Protection Act of 2008, enacted...
The Urban Level of Flood Protection Criteria was developed in response to requirements from the Central Valley Flood Protection Act of 2008, enacted by Senate Bill (SB) 5 (2007), to strengthen the link between flood management and land use.
The California Department of Water Resources (DWR) developed these criteria as a systematic approach to assist affected cities and counties within the Sacramento-San Joaquin Valley in making findings related to an urban level of flood protection before approving certain land-use decisions. In preparing these criteria, DWR used its broad experience and expertise in flood management and planning to address concerns related to flood protection and flood risk management.
RELATED CONTENT: Urban Levee Design Criteria
Urban Levee Design Criteria$0.00 Bulk Download
Urban Levee Design CriteriaCalifornia Department of Water Resources (DWR) | May 15, 2012...Summary
The Urban Levee Design Criteria (ULDC) provides engineering criteria and guidance for the design, evaluation, operation, and maintenance of levees and floodwalls that...
The Urban Levee Design Criteria (ULDC) provides engineering criteria and guidance for the design, evaluation, operation, and maintenance of levees and floodwalls that provide an urban level of flood protection (i.e., 200-year level of flood protection) in California, as well as for determining design water surface elevations (DWSE) along leveed and unleveed streams.
Other topics beyond design and evaluation are presented to provide reasonable assurance that once a levee or floodwall is found to provide an urban level of flood protection, it will continue to do so.
RELATED CONTENT: Urban Level of Flood Protection Criteria
Managing Floods in California$0.00 Bulk Download
Managing Floods in CaliforniaLegislative Analyst's Office | March 22, 2017...Summary
This report is intended to provide basic information about floods and flood management in California. (Whereas previous generations referred to “flood control” or...
This report is intended to provide basic information about floods and flood management in California. (Whereas previous generations referred to “flood control” or “flood prevention” activities, experts now prefer the term “flood management” in acknowledgement that floodwaters are recurring and inevitable.) We begin by summarizing the history, causes, and risk of floods across the state. We then describe flood management agencies, infrastructure, and strategies, as well as how governmental agencies typically respond when floods occur. Next, we describe the spending levels and funding sources currently supporting flood management efforts, as well as estimates for how much additional funding may be needed to improve those efforts. We conclude by highlighting some key challenges confronting the state in contemplating how best to manage floods in California.