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Delta Conveyance Project: Modernizing California’s Water Infrastructure, Fast Facts 2024

California Department of Water Resources (DWR) | September 13th, 2023

Summary

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Delta Islands and Levees Feasibility Study, Draft Feasibility Report and Environmental Impact Statement

U.S. Army Corps of Engineers (USACE) | April 10th, 2014

Summary

The U.S. Army Corps of Engineers and the California Department of Water Resources propose to restore approximately 89.5 acres of lost or degraded tidal marsh habitat in t

The U.S. Army Corps of Engineers and the California Department of Water Resources propose to restore approximately 89.5 acres of lost or degraded tidal marsh habitat in the west central portion of the Sacramento-San Joaquin Delta. The restoration work would involve transporting and placing dredged material into open water habitat to restore 80.3 acres and 9.2 acres of tidal marsh at Big Break and Little Franks Tract, respectively, in the Delta. The work would be conducted over 5 years as part of the annual operation and maintenance (O&M) dredging of the Stockton Deep Water Ship Channel. Previously stockpiled dredged material from existing dredged material storage sites would also be placed in conjunction with O&M. The draft report describes the affected environment in the Big Break and Little Franks Tract area; evaluates the direct, indirect, and cumulative environmental effects and the benefits of the tentatively selected plan and two alternative plans; and recommends avoidance, minimization, and mitigation measures. Most potential adverse effects would either be short term and insignificant, or would be avoided or reduced to less than significance using best management practices. Beneficial effects on vegetation and wildlife, special status species, other resources, and the historic floodplain from the alternative plans are also discussed.

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Delta Islands and Levees Sacramento – San Joaquin River Delta, California Interim Integrated Feasibility Report/ Environmental Impact Statement

U.S. Army Corps of Engineers (USACE) | November 15th, 2018

Summary

USACE initiated the Delta Study in 2006 at the request of the DWR, the non-Federal sponsor for the study. USACE is the lead agency for the Feasibility Study and is also t

USACE initiated the Delta Study in 2006 at the request of the DWR, the non-Federal sponsor for the study. USACE is the lead agency for the Feasibility Study and is also the lead under the National Environmental Policy Act (NEPA). This report: (1) identifies flood risk management and ecosystem restoration problems and opportunities in the Delta; (2) develops and evaluates measures to solve identified problems; (3) formulates and compares alternatives for ecosystem restoration; and (4) identifies a Recommended Plan (RP) for implementation. A draft of this FR/EIS was concurrently released for public review, internal policy review, Agency Technical Review (ATR), and Independent External Peer Review (IEPR). The present report has been updated based on comments received during these reviews and finalized to present the RP for eventual authorization. The RP is the most reasonably efficient contribution to the Delta, restoring 340 acres of intertidal marsh habitat in the Delta at a cost of $25M. The RP provides a unique opportunity to restore intertidal marsh, habitat which is now greatly reduced in this ecosystem of national significance. The RP links the proposed ecosystem restoration actions to historic and ongoing USACE navigation projects, providing a cost effective mechanism to implement otherwise costly subsidence reversal goals. This action would restore habitat for multiple Federally listed species, notably salmonids and Delta smelt. The restored habitat would also benefit millions of migratory fowl on the Pacific Flyway as they travel through the Delta.

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Delta Levee Investment Strategy: Final Report

Delta Stewardship Council (Delta Council) | August 4th, 2017

Summary

In the California Sacramento-San Joaquin Delta (Delta), levee failure could cause catastrophic flooding, potentially causing injury or loss of life, and possibly damaging

In the California Sacramento-San Joaquin Delta (Delta), levee failure could cause catastrophic flooding, potentially causing injury or loss of life, and possibly damaging property, water supply, infrastructure, and environmental resources of importance to the entire State of California (State). Though levee maintenance and improvements over the past three decades have reduced the frequency of levee failures, the State has no comprehensive method to prioritize its investments in Delta levees operations, maintenance, and improvement projects. The Delta Plan, adopted on May 16, 2013, recommends that the Delta Stewardship Council (Council), in consultation with the California Department of Water Resources (DWR), the Central Valley Flood Protection Board (CVFPB), the Delta Protection Commission (DPC), local agencies, and the California Water Commission, implement California Water Code (CWC) section 85306 by developing a Delta Levees Investment Strategy (DLIS) to identify funding priorities for State investments in Delta levees. The DLIS is an innovative approach for determining priorities for State funds for levee improvement in the Delta and Suisun Marsh. The DLIS, which considers the assets protected by levees, the threats to levees, and the multiple beneficiaries of levee investments, uses a risk analysis methodology to recommend priorities for State investments in levee operations, maintenance, and improvements. This methodology was developed in close coordination with State agency partners, local and regional flood management and emergency response planning agencies, and other interested parties. In total, the Council worked with 113 different stakeholders and conducted 10 public meetings, 60 stakeholder outreach meetings, and 60 interagency coordination meetings. The Council also discussed DLIS issues at 38 Council meetings and workshops, which provided opportunities for public comment. The DLIS team developed a Decision Support Tool (DST) to enable the Council and stakeholders to review and update the data and analysis that form the basis of the risk evaluation. The DST supports deliberations by summarizing information about baseline and future risks, aggregating and displaying risks, and then identifying portfolios of investments that have the potential to reduce risk to State interests. The data components in the DST are designed to be updated as new information is collected or identified.

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Delta Levee Investment Strategy: Risk Analysis Methodology

Delta Stewardship Council (Delta Council) | July 20th, 2016

Summary

Levees in California’s Sacramento-San Joaquin Delta (Delta) reduce flood risk to people, property, natural resources, and infrastructure systems of statewide importance

Levees in California’s Sacramento-San Joaquin Delta (Delta) reduce flood risk to people, property, natural resources, and infrastructure systems of statewide importance. Levee failure (such as a levee breach) could cause devastating flooding, potentially resulting in injury or loss of life, damage to property and infrastructure, disruption of water supply, and harm to environmental resources of statewide significance. Currently, the State of California (State) does not have a long-term strategy to guide future investments of its limited funding for Delta levees. The 2009 Delta Reform Act directed the Delta Stewardship Council (Council) to lead the effort to develop and recommend priorities for State investments in Delta levees to reduce flood risks and to advance the coequal goals of water supply reliability and restoring the Delta ecosystem. Working closely with other agencies and the public, the Council is developing a Delta Levees Investment Strategy (DLIS) to establish priorities for State investments in the Delta levee system. Risk, the potential for an unwanted outcome, is a principal factor in establishing priorities for State investments in levees. Specifically, risk is the probability that an adverse event (such as a flood or earthquake) will occur multiplied by the consequences of that event: Risk = Probability x Consequences As presented in this report, the DLIS is based on a comprehensive methodology that quantifies risk by considering the threats to Delta levees and the assets protected by Delta levees. The DLIS also considers the multiple beneficiaries of Delta levee investments. Building on the results of previous Delta levee planning efforts, the DLIS collects and uses the best available existing data and information from numerous sources to evaluate risks to State interests in the Delta as defined by risk to public safety; property and infrastructure; water supply reliability; the Delta ecosystem; and the unique attributes of the Delta as an evolving place. The DLIS evaluates those risks under current and potential future conditions. In early 2015, the DLIS team prepared an Interim Progress Report summarizing the work conducted during the first 9 months of the DLIS project. The report focused primarily on the methodologies planned for implementing the DLIS project to facilitate a “mid-course” review by an independent science panel, which completed its work in July 2015. Panel members offered comments for improvement and concluded that the “overall methodology of using existing data, identifying important metrics, aggregating results, and making comparisons across islands is conceptually sound” (Mitchell et al. 2015). The DLIS project includes outreach to State and local agencies, concerned stakeholders in the Delta, knowledgeable technical resources, owners and operators of Delta infrastructure, and Delta leaders and residents. The final methodologies employed in the DLIS project are reported herein and incorporate the input from the independent science panel as well as feedback and comments resulting from the outreach efforts.

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Delta Levees – Types, Uses, and Policy Options

Delta Vision Blue Ribbon Task Force (Delta Vision) | August 7th, 2008

Summary

This document was developed to support Delta Vision discussions on the role of levees in the Delta’s future. It is to clarify the different types (or design standards)

This document was developed to support Delta Vision discussions on the role of levees in the Delta’s future. It is to clarify the different types (or design standards) of levees that now exist for the Delta and what improvements could be considered. It is especially oriented toward an improved understanding of what types of levees are suitable for protecting various land uses or for other applications. Based on understanding the levee types, policy options are identified for a) selecting levee improvements to be included in the vision of the Delta’s future and b) implementing the improvements selected.

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Delta Levees Investment Strategy: Sea Level Rise Methodology

Delta Stewardship Council (Delta Council) | August 21st, 2015

Summary

This memorandum describes the methodology used to account for the impact of potential future sea level rise on the Delta Levees Investment Strategy (DLIS) metrics and how

This memorandum describes the methodology used to account for the impact of potential future sea level rise on the Delta Levees Investment Strategy (DLIS) metrics and how those impacts are incorporated into the DLIS planning tool. A description of the approach used to account for the spatial variation of tide effects in the Delta and Suisun Marsh and prediction uncertainties are also included in this memorandum.

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Delta Reclamation District Financing and Budgets

Delta Stewardship Council (Delta Council) | August 16th, 2016

Summary

This report explains the financing of the 93 reclamation districts that maintain the Delta’s levees. Reclamation districts’ primary method for raising funds is thr

This report explains the financing of the 93 reclamation districts that maintain the Delta’s levees. Reclamation districts’ primary method for raising funds is through assessments, which are levied on a per-acre basis upon property owners within a district’s boundaries. Assessments are subject to Proposition 218 procedures, and they must be approved by a vote of the affected people. A second financing tool that reclamation districts have is charging fees for services, such as irrigation or drainage services for landowners. In addition to relying on these direct financing tools, reclamation districts can also receive funds from the State or from other entities. According to data from the State Controller’s office, the median Delta reclamation districts have annual budgets of around $370,000, with property assessments serving as the primary source of revenue. Typical assessments in these districts are about $32 per acre. State funding is a supplementary source of revenue for these districts, making up about 30 percent of total revenues. On the expenditure side, more than 80 percent of typical reclamation districts’ expenditures are for “services and supplies,” which includes levee work, but also other expenses. Only 12 Delta reclamation districts have long-term debt, so State funding appears to have been successful in helping Delta reclamation districts avoid overly burdensome debt levels. The State has concentrated its reclamation district funding on certain strategic islands. Ten reclamation districts have received 62 percent of state funding over the past five years. These 10 reclamation districts that receive the most state funding also tend to have much higher property assessment rates compared to other reclamation districts. This suggests that reclamation districts are increasing their assessment rates as the State steps up its funding. Finally, reclamation districts receiving a large amount of state funds also spend much more on services and supplies, even after controlling for the size of the reclamation district. This difference suggests that reclamation districts that are not receiving significant funding from the State are primarily paying for levee maintenance projects rather than undertaking large-scale levee improvement projects.

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Delta Region Integrated Flood Management: Key Considerations and Statewide Implications

California Department of Water Resources (DWR) | September 1st, 2012

Summary

This Background / Reference Memorandum (BRM) presents highlights from flood-related technical, legislative and funding information regarding the Sacramento-San Joaquin De

This Background / Reference Memorandum (BRM) presents highlights from flood-related technical, legislative and funding information regarding the Sacramento-San Joaquin Delta (Delta), with emphasis on activities by the California Department of Water Resources (DWR). The BRM is intended to provide historical and existing conditions (year 2011) context for DWR’s use in conveying strategies for future investments in integrated flood management in the Delta under a separate document. The State of California has entrusted DWR as the agency with the responsibility for managing water flow through the Delta and for representing State interests in Delta levees. DWR invests in the Delta levee system to protect clear and identifiable State interests, including but not limited to: • Human life, public health, and property within the Delta; • Water quality and water supply for agriculture, ecosystem, and municipal and industrial water users within the Delta and water users outside of the Delta; • Ecosystem protection and enhancement, including protection and recovery of threatened and endangered species; • Critical infrastructure such as highways, railroads, aqueducts, and pumping plants; • Other infrastructure such as transmission lines (electric & petroleum), shipping channels, and public infrastructure (water and wastewater treatment plants); • Agriculture and recreation; and • Cultural, historical, aesthetic, and other values included in “Delta as a place.” State legislation and modifications to the California Water and Public Resources codes have repeatedly demonstrated the State’s interest in preserving the Delta and the importance of Delta levees. The legislation and modifications to the codes have made strong statements about the importance of the Delta, provided direction for the DWR’s levee programs, and provided funding for flood management activities and environmental stewardship in the Delta. This BRM should be considered a reference document. Due to the large number of existing documents on the Delta and its levees, this BRM provides highlights of important material with references to other documents for more detailed information. This base information should be useful when considering modifications to investment strategies for integrated flood management in the Delta.

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Delta Subsidence in California: The sinking heart of the state

U.S. Geological Survey (USGS) | April 8th, 2000

Summary

The Sacramento-San Joaquin River Delta of California once was a great tidal freshwater marsh blanketed by peat and peaty alluvium. Beginning in the late 1800s, levees wer

The Sacramento-San Joaquin River Delta of California once was a great tidal freshwater marsh blanketed by peat and peaty alluvium. Beginning in the late 1800s, levees were built along the stream channels, and the land thus protected from flooding was drained, cleared, and planted. Although the Delta is now an exceptionally rich agricultural area (over a $500 million crop value in 1993), its unique value is as a source of freshwater for the rest of the State. It is the heart of a massive north-to-south water delivery system. Much of this water is pumped southward for use in the San Joaquin Valley and elsewhere in central and southern California. The leveed tracts and islands help to protect water-export facilities in the southern Delta from saltwater intrusion by displacing water and maintaining favorable freshwater gradients. However, ongoing subsidence behind the levees reduces levee stability and, thus, threatens to degrade water quality in the massive north-to-south water-transfer system.

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Fenner Valley 7-002
Fish Lake Valley 6-014
Fremont Valley 6-046
Gilroy-Hollister Valley - Llagas Area 3-003.01
Goldstone Valley 6-048
Goleta 3-016
Harper Valley 6-047
Helendale Fault Valley 7-048
Hemet Lake Valley 8-006
Hidden Valley 4-016
Imperial Valley 7-030
Indian Wells Valley - 6-054
Iron Ridge Area 7-050
Ivanpah Valley 6-030
Jacumba Valley 7-047
Johnson Valley - Soggy Lake 7-018.01
Johnson Valley - Upper Johnson Valley 7-018.02
Joshua Tree 7-062
Kane Wash Area 6-089
Kelso Valley 6-031
Lanfair Valley 7-001
Langford Valley - Irwin 6036.02
Langford Valley - Langford Well Lake 6-036.01
Langford Valley 6-036.02
Las Posas Valley 4-008
Lavic Valley 7-014
Leach Valley 6-027
Lockwood Valley 4-017
Long Valley 6-011
Los Osos Valley - Los Osos 3-008.01
Los Osos Valley - Warden Creek 3-008.02
Lost Horse Valley 7-051
Lower Kingston Valley 6-021
Lower Mojave River Valley 6-040
Lucerne Valley 7-019
Malibu Valley 4-022
Means Valley 7-017
Mesquite Valley 6-029
Middle Amargosa Valley - 6-020
Middle Mojave River Valley 6-041
Mission Valley 9-014
Modoc) 5-004
Morongo Valley 7-020
Morro Valley 3-041
Napa-Sonoma Valley - Napa-Sonoma Lowlands 2-002.03
Needles Valley 7-044
Ocotillo-Clark Valley 7-025
Ogilby Valley 7-035
Ojai Valley 4-002
Orocopia Valley - 7-031
Owens Valley - Fish Slough 6-012.02
Owens Valley 6-012.01
Owl Lake Valley 6-088
Pahrump Valley 6-028
Palo Verde Mesa 7-039
Palo Verde Valley 7-038
Pamo Valley 9-024
Panamint Valley 6-058
Peach Tree Valley 3-032
Petaluma Valley 2-001
Pilot Knob Valley 6-051
Pinto Valley 7-006
Pipes Canyon Fault Valley 7-049
Pittsburgh Plain 2-004
Piute Valley 7-045
Pleasant Valley 4-006
Potrero Valley 9-029
Poway Valley 9-013
Raymond 4-023
Red Pass Valley 6-024
Redding Area - Anderson 5-006.03
Redding Area - Bowman 5-006.01
Redding Area - Enterprise 5-006.04
Redding Area - Millville 5-006.05
Redding Area - South Battle Creek 5-006.06
Rice Valley 7-004
Riggs Valley 6-023
Russell Valley 4-020
Sacramento Valley - Antelope 5-021.54
Sacramento Valley - Bend 5-021.53
Sacramento Valley - Butte 5-021.70
Sacramento Valley - Colusa 5-021.52
Sacramento Valley - Corning 5-021.51
Sacramento Valley - Los Molinos 5-021.56
Sacramento Valley - North American (5-021.64)
Sacramento Valley - North Yuba 5-021.60
Sacramento Valley - Red Bluff 5-021.50
Sacramento Valley - Solano 5-021.66
Sacramento Valley - South American 5-021.65
Sacramento Valley - South Yuba 5-021.61
Sacramento Valley - Sutter 5-021.62
Sacramento Valley - Vina 5-021.57
Sacramento Valley - Wyandotte Creek 5-021.69
Sacramento Valley - Yolo 5021.67
Salinas Valley - 180/400 Foot Aquifer 3-004.01
Salinas Valley - Atascadero Area 3-004.11
Salinas Valley - East Side Aquifer 3-004.02
Salinas Valley - Forebay Aquifer 3-004.04
Salinas Valley - Langley Area 3-004.09
Salinas Valley - Monterey 3-004.10
Salinas Valley - Paso Robles Area 3-004.06
Salinas Valley - Upper Valley Aquifer 3-004.05
Saline Valley 6-017
Salt Wells Valley 6-053
San Antonio Creek Valley 3-014
San Dieguito Creek 9-012
San Elijo Valley 9-023
San Felipe Valley 7-027
San Fernando Valley 4-012
San Gabriel Valley 4-013
San Jacinto 8-005
San Joaquin Valley - Chowchilla 5-022.05
San Joaquin Valley - Cosumnes (5-022.16)
San Joaquin Valley - Delta-Mendota 5-022.07
San Joaquin Valley - East Contra Costa 5-022.19
San Joaquin Valley - Eastern San Joaquin 5-022.01
San Joaquin Valley - Kaweah 5-022.11
San Joaquin Valley - Kern 5-022.14
San Joaquin Valley - Kings 5-022.08
San Joaquin Valley - Madera 5-022.06
San Joaquin Valley - Merced 5-022.04
San Joaquin Valley - Modesto 5-022.02
San Joaquin Valley - Pleasant Valley 5-022.10
San Joaquin Valley - Tracy 5-022.15
San Joaquin Valley - Tulare Lake 5-022.12
San Joaquin Valley - Tule 5-022.13
San Joaquin Valley - Turlock 5-022.03
San Joaquin Valley - Westside 5-022.09
San Joaquin Valley - White Wolf 5-022.18
San Juan Valley 9-001
San Luis Obispo Valley 3-009
San Luis Rey Valley - Lower San Luis Rey Valley 9-007.02
San Luis Rey Valley - Upper San Luis Rey Valley 9-007.01
San Marcos Area 9-032
San Mateo Valley 9-002
San Onofre Valley 9-003
San Pasqual Valley 9-010
Santa Barbara 3-017
Santa Clara River Valley - Fillmore 4-004.05
Santa Clara River Valley - Mound 4-004.03
Santa Clara River Valley - Oxnard 4-004.02
Santa Clara River Valley - Piru 4-004.06
Santa Clara River Valley - Santa Clara River Valley East 4-004.07
Santa Clara River Valley - Santa Paula 4-004.04
Santa Clara Valley - East Bay Plain 2-009.04
Santa Clara Valley - Niles Cone 2-009.01
Santa Clara Valley - San Mateo Plain 2-009.03
Santa Clara Valley - Santa Clara 2-009.02
Santa Cruz Mid-County 3-001
Santa Margarita 3-027
Santa Maria River Valley - Arroyo Grande 3-012.02
Santa Maria River Valley - Santa Maria 3-012.01
Santa Maria River Valley 3-012.02
Santa Maria Valley 9-011
Santa Rosa Valley - Santa Rosa Plain 1-055.01
Santa Ynez River Valley 3-015
Scott River Valley 1-005
Searles Valley 6-052
Seven Oaks Valley 8-008
Shasta Valley 1-004
Sierra Valley 5-012.01
Silver Lake Valley 6-034
Simi Valley 4-009
Soda Lake Valley 6-033
South San Diego River Valley 9-015
Superior Valley 6-049
Temecula Valley 9-005
Terwilliger Valley 7-026
Thousand Oaks Area 4-019
Tule Lake 1-002-01
Twentynine Palms Valley 7-010
Ukiah Valley 1-052
Upper Kingston Valley 6-022
Upper Mojave River Valley 6-042
Upper Ojai Valley 4-001
Upper Santa Ana Valley - Chino 8-002.01
Upper Santa Ana Valley - Cucamonga 8-002.02
Upper Santa Ana Valley - Rialto-Colton 8-002.04
Upper Santa Ana Valley - Riverside-Arlington 8-002.03
Upper Santa Ana Valley - San Bernardino 8-002.06
Upper Santa Ana Valley - San Timoteo 8-002.08
Upper Santa Ana Valley - Temescal 8-002.09
Upper Santa Ana Valley - Yucaipa 8-002.07
Vallecito-Carrizo Valley 7-028
Ventura River Valley - Lower Ventura River 4-003.02
Ventura River Valley - Upper Ventura River 4-003.01
Vidal Valley 7-042
Ward Valley 7-003
Warren Valley 7-012
West Salton Sea
Wingate Valley 6-019
Yuma Valley 7-036

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