DOCSLIB.ORG

Prospect Island Tidal Habitat Restoration Project: Admin Final Restoration Plan

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Prospect Island Tidal Habitat Restoration Project: Admin Final Restoration Plan DEPARTMENT OF WATER RESOURCES AGREEMENT # 4600009291 ADMIN FINAL ◦ JUNE 2014 Prospect Island Tidal Habitat Restoration Project: Admin Final Restoration Plan ADMIN FINAL Prospect Island Tidal Habitat Restoration Project NOT FOR CIRCULATION Admin Final Restoration Plan Suggested Citation: Department of Water Resources and Department of Fish and Wildlife. 2014. Prospect Island Tidal Habitat Restoration Project: Draft Restoration Plan. Prepared with assistance from Wetlands and Water Resources, Inc., San Rafael, California and Stillwater Sciences, Davis, California for Department of Water Resources, West Sacramento, California. Contract No. 4200009291. June. June 2014 i ADMIN FINAL Prospect Island Tidal Habitat Restoration Project NOT FOR CIRCULATION Admin Final Restoration Plan Table of Contents Abreviations ......................................................................................................... vi 1 Introduction ...................................................................................................1-1 1.1 Project Site ........................................................................................1-1 1.2 Restoration Actions ............................................................................1-2 2 Project Purpose, Goal, and Objectives ......................................................... 2-1 2.1 Purpose .............................................................................................2-1 2.2 Project Goal .......................................................................................2-2 2.3 Project Objectives .............................................................................. 2-2 3 Regional Setting ........................................................................................... 3-1 3.1 Landscape Position ........................................................................... 3-1 3.2 Regional Ecosystem Restoration Efforts ............................................ 3-3 4 Existing Site Conditions ................................................................................ 4-1 4.1 Site History ........................................................................................ 4-1 4.2 Current Land Use and Ownership ..................................................... 4-3 4.2.1 Surrounding properties ................................................................. 4-3 4.2.2 Nearby municipal areas ................................................................ 4-5 4.3 Physical Resources ........................................................................... 4-7 4.3.1 Levees ..........................................................................................4-7 4.3.2 Soils ..............................................................................................4-9 4.3.3 Topography ................................................................................ 4-11 4.3.4 Site hydrology ............................................................................. 4-13 4.3.5 Adjacent channels and sloughs .................................................. 4-17 4.3.6 Sediment Regime in Miner Slough ............................................. 4-19 4.3.7 Utilities, gas wells, mineral rights, infrastructure, easements ..... 4-20 4.4 Biological Resources ....................................................................... 4-23 4.4.1 Natural communities ................................................................... 4-23 4.4.2 Special-status species ................................................................ 4-26 4.4.3 Jurisdictional wetlands and waters ............................................. 4-42 4.5 Cultural Resources .......................................................................... 4-44 4.6 Hazards and Hazardous Materials ................................................... 4-45 5 Opportunities and Constraints ...................................................................... 5-1 6 Proposed Project and Alternatives ............................................................... 6-1 6.1 Overview of Proposed Project and Alternatives ................................. 6-1 6.2 Proposed Project ............................................................................. 6-11 6.2.1 South property levee repair ........................................................ 6-17 6.2.2 Pre-construction site preparation: dewatering, clearing and grubbing, access roads and ramps, staging areas ..................... 6-17 6.2.3 Pre-restoration invasive plant species control ............................ 6-21 June 2014 ii ADMIN FINAL Prospect Island Tidal Habitat Restoration Project NOT FOR CIRCULATION Admin Final Restoration Plan 6.2.4 Debris, old infrastructure, and dead tree/snag removal .............. 6-26 6.2.5 Excavate constructed channel network ...................................... 6-27 6.2.6 Block or fill remnant agricultural ditches ..................................... 6-30 6.2.7 Construct interior topographic features ....................................... 6-30 6.2.8 Construct eastern toe berm ........................................................ 6-31 6.2.9 Construct eastern intertidal bench .............................................. 6-34 6.2.10 Breach internal cross levee ........................................................ 6-36 6.2.11 Construct breach velocity dissipation feature ............................. 6-38 6.2.12 Dredge Miner Slough spur channel ............................................ 6-40 6.2.13 Breach Miner Slough levee ........................................................ 6-40 6.2.14 Construction implementation schedule ....................................... 6-43 6.2.15 Anticipated Future Habitat Conditions, Proposed Project ........... 6-43 6.3 Post Construction Site Maintenance, Monitoring, and Adaptive Management Activities ..................................................................... 6-48 6.4 Restoration Alternative 1 .................................................................. 6-49 6.5 Restoration Alternative 2 .................................................................. 6-49 6.5.1 Construct Overflow Weir ............................................................. 6-49 6.5.2 Breach Miner Slough levee ........................................................ 6-50 6.5.3 Anticipated Future Habitat Conditions, Alternative 2 .................. 6-50 6.6 Restoration Alternative 3 .................................................................. 6-56 6.6.1 Breach Miner Slough levee ........................................................ 6-56 6.6.2 Anticipated Future Habitat Conditions, Alternative 3 .................. 6-57 7 Contributing Authors .....................................................................................7-1 8 Literature Cited ............................................................................................. 8-1 June 2014 iii ADMIN FINAL Prospect Island Tidal Habitat Restoration Project NOT FOR CIRCULATION Admin Final Restoration Plan List of Tables Table 1-1. Project Areas ............................................................................................................... 1-1 Table 3-1. Natural, Constructed, and Planned Ecosystem Restoration Efforts in the Cache- Yolo Region. ......................................................................................................................... 3-3 Table 4-1. Elevations of DWR and Port Prospect Island Properties .......................................... 4-11 Table 4-2. Tidal Datums in the Vicinity of Prospect Island. ........................................................ 4-15 Table 4-3. Special-status Plant Occurrences Documented at the Project Site (CNDDB; DWR, unpubl. data). ...................................................................................................................... 4-28 Table 4-4. Special-status Fish Species with the Potential to Occur at the Project Site. ............ 4-31 Table 4-5. Special-status Wildlife Species with the Potential to Occur at the Project Site. ....... 4-36 Table 4-6. Preliminary USACE jurisdictional waters and wetlands in the Project area. ............. 4-42 Table 5-1. Prospect Island Opportunities and Constraints Summary. ......................................... 5-2 Table 6-1. General Project Features ............................................................................................ 6-5 Table 6-2. Restoration Activities and Features of the Proposed Project and Alternatives ........... 6-6 Table 6-3. Restoration Features Quantities for Proposed Project and Alternatives .................. 6-14 Table 6-4. Removal techniques for aquatic emergent and terrestrial non-native invasive plant species (WWR-Stillwater Sciences 2013). ......................................................................... 6-22 Table 6-5. Timeline of invasive plant species removal techniques. ........................................... 6-24 Table 6-6. Estimated Construction Implementation Timing ....................................................... 6-43 Table 6-7. Prospect Island Habitats: Existing, Projected As-Built, and Future, Proposed Project1 ............................................................................................................................... 6-45 Table 6-8. Prospect Island Habitats: Existing, Projected As-Built, and Future, Alternative 21 ... 6-52 Table 6-9. Prospect Island Habitats: Existing, Projected As-Built, and Future, Alternative 31 ... 6-58 List of Figures Figure
Load more

Recommended publications
  • 0 5 10 15 20 Miles Μ and Statewide Resources Office
    Woodland RD Name RD Number Atlas Tract 2126 5 !"#$ Bacon Island 2028 !"#$80 Bethel Island BIMID Bishop Tract 2042 16 ·|}þ Bixler Tract 2121 Lovdal Boggs Tract 0404 ·|}þ113 District Sacramento River at I Street Bridge Bouldin Island 0756 80 Gaging Station )*+,- Brack Tract 2033 Bradford Island 2059 ·|}þ160 Brannan-Andrus BALMD Lovdal 50 Byron Tract 0800 Sacramento Weir District ¤£ r Cache Haas Area 2098 Y o l o ive Canal Ranch 2086 R Mather Can-Can/Greenhead 2139 Sacramento ican mer Air Force Chadbourne 2034 A Base Coney Island 2117 Port of Dead Horse Island 2111 Sacramento ¤£50 Davis !"#$80 Denverton Slough 2134 West Sacramento Drexler Tract Drexler Dutch Slough 2137 West Egbert Tract 0536 Winters Sacramento Ehrheardt Club 0813 Putah Creek ·|}þ160 ·|}þ16 Empire Tract 2029 ·|}þ84 Fabian Tract 0773 Sacramento Fay Island 2113 ·|}þ128 South Fork Putah Creek Executive Airport Frost Lake 2129 haven s Lake Green d n Glanville 1002 a l r Florin e h Glide District 0765 t S a c r a m e n t o e N Glide EBMUD Grand Island 0003 District Pocket Freeport Grizzly West 2136 Lake Intake Hastings Tract 2060 l Holland Tract 2025 Berryessa e n Holt Station 2116 n Freeport 505 h Honker Bay 2130 %&'( a g strict Elk Grove u Lisbon Di Hotchkiss Tract 0799 h lo S C Jersey Island 0830 Babe l Dixon p s i Kasson District 2085 s h a King Island 2044 S p Libby Mcneil 0369 y r !"#$5 ·|}þ99 B e !"#$80 t Liberty Island 2093 o l a Lisbon District 0307 o Clarksburg Y W l a Little Egbert Tract 2084 S o l a n o n p a r C Little Holland Tract 2120 e in e a e M Little Mandeville
    [Show full text]
  • Transitions for the Delta Economy
    Transitions for the Delta Economy January 2012 Josué Medellín-Azuara, Ellen Hanak, Richard Howitt, and Jay Lund with research support from Molly Ferrell, Katherine Kramer, Michelle Lent, Davin Reed, and Elizabeth Stryjewski Supported with funding from the Watershed Sciences Center, University of California, Davis Summary The Sacramento-San Joaquin Delta consists of some 737,000 acres of low-lying lands and channels at the confluence of the Sacramento and San Joaquin Rivers (Figure S1). This region lies at the very heart of California’s water policy debates, transporting vast flows of water from northern and eastern California to farming and population centers in the western and southern parts of the state. This critical water supply system is threatened by the likelihood that a large earthquake or other natural disaster could inflict catastrophic damage on its fragile levees, sending salt water toward the pumps at its southern edge. In another area of concern, water exports are currently under restriction while regulators and the courts seek to improve conditions for imperiled native fish. Leading policy proposals to address these issues include improvements in land and water management to benefit native species, and the development of a “dual conveyance” system for water exports, in which a new seismically resistant canal or tunnel would convey a portion of water supplies under or around the Delta instead of through the Delta’s channels. This focus on the Delta has caused considerable concern within the Delta itself, where residents and local governments have worried that changes in water supply and environmental management could harm the region’s economy and residents.
    [Show full text]
  • Fall 2015 CCSDA Newsletter
    Contra Costa Special Districts Association Newsletter Contra Costa Chapter of the California Special Districts Association Fall 2015 October 2015 Ironhouse Sanitary District General Ironhouse new General Manager Manager Tom Williams Retires Chad Davisson, the new General Manager for Ironhouse You don’t have to look too hard to see the changes, Sanitary District (ISD), started on July 13, 2015. Chad innovations and conservation techniques that Tom comes to the District with over 25 years of wastewater Williams has helped bring to Ironhouse Sanitary District industry experience. (ISD) during his 15 years there, including the past 10 as He also has 10 years of general manager. It is those lasting contributions that executive level organization Williams leaves behind. management experience. He has a Bachelor of Arts Congratulations Degree in Public Administration Tom Williams for 15 from San Diego State University and is scheduled to receive his years’ service, ten MBA Degree from Saint Mary’s College in Moraga January years as Manager! 2016. He served as the General Manager of the Richmond First hired as the district’s engineer under the Municipal Sewer District, worked for the City of San leadership of then GM David Bauer, Williams dove in Mateo as the Environmental Services Division Manager, on existing projects around the old treatment plant. the Water Reclamation Systems Plant Manager for When Bauer retired, Williams easily made the transition Olivenhain Water District and the Industrial Waste to overseeing the day-to-day operations of the district. Control Representative for the County of San Diego. One of his first major projects was building a railroad He has also worked as a consultant for Crescent City, undercrossing to safely bring workers and the public the City of Ontario, the City of Montclair and the past what had been a non-signalized grade crossing Olivenhain Municipal Water District.
    [Show full text]
  • Transitions for the Delta Economy
    Transitions for the Delta Economy January 2012 Josué Medellín-Azuara, Ellen Hanak, Richard Howitt, and Jay Lund with research support from Molly Ferrell, Katherine Kramer, Michelle Lent, Davin Reed, and Elizabeth Stryjewski Supported with funding from the Watershed Sciences Center, University of California, Davis Summary The Sacramento-San Joaquin Delta consists of some 737,000 acres of low-lying lands and channels at the confluence of the Sacramento and San Joaquin Rivers (Figure S1). This region lies at the very heart of California’s water policy debates, transporting vast flows of water from northern and eastern California to farming and population centers in the western and southern parts of the state. This critical water supply system is threatened by the likelihood that a large earthquake or other natural disaster could inflict catastrophic damage on its fragile levees, sending salt water toward the pumps at its southern edge. In another area of concern, water exports are currently under restriction while regulators and the courts seek to improve conditions for imperiled native fish. Leading policy proposals to address these issues include improvements in land and water management to benefit native species, and the development of a “dual conveyance” system for water exports, in which a new seismically resistant canal or tunnel would convey a portion of water supplies under or around the Delta instead of through the Delta’s channels. This focus on the Delta has caused considerable concern within the Delta itself, where residents and local governments have worried that changes in water supply and environmental management could harm the region’s economy and residents.
    [Show full text]
  • Comparing Futures for the Sacramento-San Joaquin Delta
    comparing futures for the sacramento–san joaquin delta jay lund | ellen hanak | william fleenor william bennett | richard howitt jeffrey mount | peter moyle 2008 Public Policy Institute of California Supported with funding from Stephen D. Bechtel Jr. and the David and Lucile Packard Foundation ISBN: 978-1-58213-130-6 Copyright © 2008 by Public Policy Institute of California All rights reserved San Francisco, CA Short sections of text, not to exceed three paragraphs, may be quoted without written permission provided that full attribution is given to the source and the above copyright notice is included. PPIC does not take or support positions on any ballot measure or on any local, state, or federal legislation, nor does it endorse, support, or oppose any political parties or candidates for public office. Research publications reflect the views of the authors and do not necessarily reflect the views of the staff, officers, or Board of Directors of the Public Policy Institute of California. Summary “Once a landscape has been established, its origins are repressed from memory. It takes on the appearance of an ‘object’ which has been there, outside us, from the start.” Karatani Kojin (1993), Origins of Japanese Literature The Sacramento–San Joaquin Delta is the hub of California’s water supply system and the home of numerous native fish species, five of which already are listed as threatened or endangered. The recent rapid decline of populations of many of these fish species has been followed by court rulings restricting water exports from the Delta, focusing public and political attention on one of California’s most important and iconic water controversies.
    [Show full text]
  • Summary of Floods Ir the United States During 1960
    Summary of Floods ir the United States During 1960 By J. O. ROSTVEDT FLOODS OF 1960 IN THE UNITED STATES GEOLOGICAL SURVEY WATER-SUPPLY PAPER 1790-B Prepared in cooperation with Federal, State, and local agencies CNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1965 UNITED STATES DEPARTMENT OF THE DTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.G. 20402 - Price 45 cents (pap^r cover) CONTENTS Page Abstract___-_--_____-__-____---_--__-______-___-___.____________ Bl Introduction._____________________________________________________ 1 Determination of flood stages and discharges_________________________ 6 Explanation of data_________________-__-___________________-_____- 11 Summary of floods of 1960_____________________________________ 13 Floods of: February 8-10 in northern California._______________________ 13 March 7-9 in southern Idaho.______,____-__-__-_-_____-____ 18 March 17-April 5 in central Florida.________________________ 20 March-April in the Skunk River and lower Iowa River basins, Iowa_ _________________________________________________ 24 March 29-April 6 in southeastern Wisconsin and northeastern Illinois.----.-.-_____________________________-. 27 March-April in eastern Nebraska and adjacent areas._________ 30 March 30-April 6 in New York___-_-_____---_-__-_-_--__-__ 47 April 15^19 in west-central Missouri.________________________ 51 April and May in northern Wisconsin and Michigan Upper Peninsula. ___ ___________-_-______-__-_-_--___-_-_-_-_-__ 53 May 4-6 in northwestern Arkansas and east-central Oklahoma. _ 58 May 5-9 in southern Mississippi.___________________________ 60 May 6 in south-central Missouri.- __________________________ 64 May 19-22 in southwestern Arkansas and southeastern Okla­ homa.
    [Show full text]
  • REPORT 1St Session HOUSE of REPRESENTATIVES 104–149 " !
    104TH CONGRESS REPORT 1st Session HOUSE OF REPRESENTATIVES 104±149 " ! ENERGY AND WATER DEVELOPMENT APPROPRIATIONS BILL, 1996 JUNE 20, 1995.ÐCommitted to the Committee of the Whole House on the State of the Union and ordered to be printed Mr. MYERS of Indiana, from the Committee on Appropriations, submitted the following R E P O R T together with ADDITIONAL VIEWS [To accompany H.R. 1905] The Committee on Appropriations submits the following report in explanation of the accompanying bill making appropriations for en- ergy and water development for the fiscal year ending September 30, 1996, and for other purposes. INDEX TO BILL AND REPORT Page Number Bill Report I. Department of DefenseÐCivil: Corps of engineersÐCivil: General investigations ................................................................. 2 6 Construction, general .................................................................. 3 26 Flood control, Mississippi River and tributaries, Arkansas, Il- linois, Kentucky, Louisiana, Mississippi, Missouri, and Tennessee .................................................................................. 5 36 Operation and maintenance, general ......................................... 5 38 Regulatory program ..................................................................... 6 52 Flood control and coastal emergencies ....................................... 6 52 Oil spill research .......................................................................... 7 52 General expenses ........................................................................
    [Show full text]
  • Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA
    UC Davis San Francisco Estuary and Watershed Science Title Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA Permalink https://escholarship.org/uc/item/7xd4x0xw Journal San Francisco Estuary and Watershed Science, 8(2) ISSN 1546-2366 Authors Deverel, Steven J Leighton, David A Publication Date 2010 DOI https://doi.org/10.15447/sfews.2010v8iss2art1 Supplemental Material https://escholarship.org/uc/item/7xd4x0xw#supplemental License https://creativecommons.org/licenses/by/4.0/ 4.0 Peer reviewed eScholarship.org Powered by the California Digital Library University of California august 2010 Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA Steven J. Deverel1 and David A. Leighton Hydrofocus, Inc., 2827 Spafford Street, Davis, CA 95618 AbStRACt will range from a few cm to over 1.3 m (4.3 ft). The largest elevation declines will occur in the central To estimate and understand recent subsidence, we col- Sacramento–San Joaquin Delta. From 2007 to 2050, lected elevation and soils data on Bacon and Sherman the most probable estimated increase in volume below islands in 2006 at locations of previous elevation sea level is 346,956,000 million m3 (281,300 ac-ft). measurements. Measured subsidence rates on Sherman Consequences of this continuing subsidence include Island from 1988 to 2006 averaged 1.23 cm year-1 increased drainage loads of water quality constitu- (0.5 in yr-1) and ranged from 0.7 to 1.7 cm year-1 (0.3 ents of concern, seepage onto islands, and decreased to 0.7 in yr-1). Subsidence rates on Bacon Island from arability.
    [Show full text]
  • A Century of Delta Salt Water Barriers
    A Century of Salt Water Barriers in the Delta By Tim Stroshane Policy Analyst Restore the Delta June 5, 2015 edition Since the late 19th century, California’s basic plan for water resource development has been to export water from the Sacramento River and the Delta to the San Joaquin Valley and southern California. Unfortunately, this basic plan ignores the reality that the Delta is the very definition of an estuary: it is where fresh water from the Central Valley’s rivers meets salt water from tidal flow to the Delta from San Francisco Bay. Productive ecosystems have thrived in the Delta for millenia prior to California statehood. But for nearly a century now, engineers and others have frequently referred to the Delta as posing a “salt menace,” a “salinity problem” with just two solutions: either maintain a predetermined stream flow from the Delta to Suisun Bay to hydraulically wall out the tide, or use physical barriers to separate saline from fresh water into the Delta. While readily admitting that the “salt menace” results from reduced inflows from the Delta’s major tributary rivers, the state of California uses salt water barriers as a technological fix to address the symptoms of the salinity problem, rather than the root causes. Given complex Delta geography, these two main solutions led to many proposals to dam up parts of San Francisco Bay, Carquinez Strait, or the waterway between Chipps Island in eastern Suisun Bay and the City of Antioch, or to use large amounts of water—referred to as “carriage water”— to hold the tide literally at bay.
    [Show full text]
  • C a S E S T U D Y R E P O R T Sherman Island Delta
    C A S E S T U D Y R E P O R T SHERMAN ISLAND DELTA PROJECT November 2013 Written by Bradley Angell, Richard Fisher & Ryan Whipple a project of Ante Meridiem Incorporated with the direct support of the Delta Alliance International Foundation © 2013 Ante Meridiem Incorporated ABSTRACT This report is an official beginning to a model design for Sherman Island, an important land mass that lies at the meeting point of the Sacramento and San Joaquin Rivers of the California Delta system. As design is typically dominated by a particular driving discipline or a paramount policy concern, the resulting decision-making apparatus is normally governed by that discipline or policy. After initial review of Sherman Island, such a “single” discipline or “principle” policy approach is not appropriate for Sherman Island. At this critical physical place at the heart of California Delta, an inter-disciplinary and equal-weighted policy balance is necessary to meet both the immediate and long-term requirements for rehabilitation of the project site. Exhibiting the collected work of a small team of design and policy specialists, the Case Study Report for the Sherman Island Delta Project outlines the multitude of interests, disciplines and potential opportunities for design expression on the selected 1,000 acre portion of Sherman Island under review. Funded principally by a generous grant from the Delta Alliance, the team researched applicable uses and technologies with a pragmatic case study approach to the subject, physically documenting exhibitions of each technology as geographically close to the project site as possible. After study and on-site documentation, the team compiled this wealth of discovery in three substantive chapters: a site characterization report, the stakeholders & goals assessment, and a case study report.
    [Show full text]
  • Designing a High-Frequency Nutrient and Biogeochemical Monitoring Network for the Sacramento–San Joaquin Delta, Northern California
    Prepared in cooperation with the Delta Regional Monitoring Program Designing a High-Frequency Nutrient and Biogeochemical Monitoring Network for the Sacramento–San Joaquin Delta, Northern California Scientific Investigations Report 2017–5058 U.S. Department of the Interior U.S. Geological Survey FRONT COVER: Top left: Photograph showing monitoring buoy at Liberty Island, California, being serviced by hydrologic technician. Photograph by Bryan Downing, December 19, 2013. Bottom Left: Example of a daily report for the monitoring buoy in Liberty Island, California that is emailed out to interested parties. Report generated by Frank Anderson, 2014. Bottom middle: Photograph showing vertical water quality profiler in the Sacramento River. Photograph by Michael Sauer, April 16, 2013. Right: Map of nitrate concentrations collected via high speed boat mapping in the Cache Slough Complex/North Delta. Map created by Travis von Dessonneck and Bryan Downing, October 10, 2014. BACK COVER: Top left: Photograph showing monitoring buoy at Liberty Island, California. Photograph by Bryan Downing, March 8, 2017. Bottom Left: Photograph showing vertical profiling instrumentation, Sacramento River, Freeport, California. Photograph courtesy of Michael Sauer, April 16, 2013. Right: Photograph showing flow monitoring station in Liberty Island, California. Photograph by Bryan Downing, March 8, 2017. Bottom: Photograph showing sunset in the northern Delta, Little Holland Tract, California. Photograph by Bryan Downing, March 8, 2017. Designing a High-Frequency Nutrient and Biogeochemical Monitoring Network for the Sacramento–San Joaquin Delta, Northern California By Brian A. Bergamaschi, Bryan D. Downing, Tamara E.C. Kraus, and Brian A. Pellerin Prepared in cooperation with the Delta Regional Monitoring Program Scientific Investigations Report 2017–5058 U.S.
    [Show full text]
  • Subsidence Reversal for Tidal Reconnection
    PERFORMANCE MEASURE 4.12: SUBSIDENCE REVERSAL FOR TIDAL RECONNECTION Performance Measure 4.12: Subsidence Reversal for Tidal Reconnection Performance Measure (PM) Component Attributes Type: Output Performance Measure Description 1 Subsidence reversal 0F activities are located at shallow subtidal elevations to prevent net loss of future opportunities to restore tidal wetlands in the Delta and Suisun Marsh. Expectations Preventing long-term net loss of land at intertidal elevations in the Delta and Suisun Marsh from impacts of sea level rise and land subsidence. Metric 1. Acres of Delta and Suisun Marsh land with subsidence reversal activity located on islands with large areas at shallow subtidal elevations. This metric will be reported annually. 2. Average elevation accretion at each project site presented in centimeters per year. This metric will be reported every five years. Baseline 1. In 2019, zero acres of subsidence reversal on islands with large areas at shallow subtidal elevations. 2. Short-term elevation accretion in the Delta at 4 centimeters per year. 1 Subsidence reversal is a process that halts soil oxidation and accumulates new soil material in order to increase land elevations. Examples of subsidence reversal activities are rice cultivation, managed wetlands, and tidal marsh restoration. DELTA PLAN, AMENDED – PRELIMINARY DRAFT NOVEMBER 2019 1 PERFORMANCE MEASURE 4.12: SUBSIDENCE REVERSAL FOR TIDAL RECONNECTION Target 1. By 2030, 3,500 acres in the Delta and 3,000 acres in Suisun Marsh with subsidence reversal activities on islands, with at least 50 percent of the area or with at least 1,235 acres at shallow subtidal elevations. 2. An average elevation accretion of subsidence reversal is at least 4 centimeters per year up to 2050.
    [Show full text]