Coastal Protection and Restoration Authority 150 Terrace Avenue, Baton Rouge, LA 70802 | [email protected] | www.coastal.la.gov 2017 Coastal Master Plan Appendix A: Project Definition Report: Final Date: April 2017 Prepared By: Brett McMann, Mike Schulze, Heather Sprague, and Kerri Smyth 2017 Coastal Master Plan: Project Definition Coastal Protection and Restoration Authority This document was prepared in support of the 2017 Coastal Master Plan being prepared by the Coastal Protection and Restoration Authority (CPRA). CPRA was established by the Louisiana Legislature in response to Hurricanes Katrina and Rita through Act 8 of the First Extraordinary Session of 2005. Act 8 of the First Extraordinary Session of 2005 expanded the membership, duties, and responsibilities of CPRA and charged the new authority to develop and implement a comprehensive coastal protection plan, consisting of a master plan (revised every five years) and annual plans. CPRA's mandate is to develop, implement, and enforce a comprehensive coastal protection and restoration master plan. Suggested Citation: McMann, B., Schulze, M., Sprague, H, and Smyth, K. (2017). 2017 Coastal Master Plan: Appendix A: Project Definition. Version Final. (pp.1- 119). Baton Rouge, Louisiana: Coastal Protection and Restoration Authority. Page | ii 2017 Coastal Master Plan: Project Definition Acknowledgements This document was developed in support of the 2017 Coastal Master Plan under the guidance of the Master Plan Delivery Team. The following CPRA staff provided input to and/or review of the document: Karim Belhadjali, Melanie Saucier, Mandy Green, Rudy Simoneaux, Jas Singh, Glenn Ledet, Tye Fitzgerald, and Russ Joffrion. This effort was funded by CPRA under Contract Number 2503-13-46, Task Order No. 6. Page | iii 2017 Coastal Master Plan: Project Definition Executive Summary As coastal Louisiana faces increasing threats from flooding and sea level rise, there is a great need to advance our scientific understanding of the coast and how coastal Louisiana will need to adapt to future conditions. The Coastal Protection and Restoration Authority (CPRA) is undertaking this challenge through five year updates of Louisiana’s Comprehensive Master Plan for a Sustainable Coast. The 2017 Coastal Master Plan builds on past progress and establishes a clear vision for the future. It carries the 2007 and 2012 plans forward by improving the methods used to ensure projects are completed as efficiently and effectively as possible. This document summarizes the process by which CPRA developed the list of candidate projects to evaluate for consideration in the 2017 Coastal Master Plan. Following development of the candidate projects list, specific project details were required to define project features affecting the landscape in the coastal system, as well as the economic analysis and prioritization of projects. This was accomplished by the development of specific attributes for each type of candidate project to provide physical and monetary parameters needed by the Integrated Compartment Model (ICM), the Coastal Louisiana Risk Assessment (CLARA) model, and the Planning Tool. This document presents the principal project attribute assumptions for each project type. In addition, fact sheets describing each restoration and risk reduction project evaluated for the master plan are provided as an attachment to this document as well as parish fact sheets that detail the potential impacts of future without action and future with implementation of the master plan at the parish level. Page | iv 2017 Coastal Master Plan: Project Definition Table of Contents Coastal Protection and Restoration Authority ............................................................................................ ii Acknowledgements ......................................................................................................................................... iii Executive Summary ......................................................................................................................................... iv List of Tables ...................................................................................................................................................... vii List of Figures .....................................................................................................................................................viii List of Abbreviations ......................................................................................................................................... ix 1.0 Introduction .......................................................................................................................................... 1 1.1 Developing a List of Projects ............................................................................................................. 1 1.1.1 Refinement of 2012 Coastal Master Plan Projects ....................................................................... 1 1.1.2 2017 New Project Development Program ..................................................................................... 9 1.1.3 Programmatic Measures for Oyster Reef and Hydrologic Restoration .................................. 22 1.1.4 Identify Candidate Projects from 2012 for Reconsideration .................................................... 23 1.1.5 Project Variations Examined ........................................................................................................... 29 1.2 The Project List .................................................................................................................................... 30 1.2.1 Restoration Projects .......................................................................................................................... 30 1.2.2 Structural Protection Projects ......................................................................................................... 57 1.2.3 Nonstructural Risk Reduction Projects .......................................................................................... 60 2.0 Project Attributes Assumptions ........................................................................................................ 63 2.1 Task Attribute Descriptions and Background ............................................................................... 63 2.2 General Attributes Common for all Project Types ....................................................................... 63 2.3 Planning Tool Attributes Common for all Project Types ............................................................. 64 2.4 General/Planning Tool Attributes Specific to Project Types ...................................................... 65 2.5 Detailed Project Attribute Assumptions and Rationale (Excluding Nonstructural) ............... 69 2.5.1 Project Feature Development ....................................................................................................... 69 2.5.2 Project Total Cost Development and Rationale ........................................................................ 69 2.5.3 Project Total Cost Breakdown ........................................................................................................ 69 2.5.4 Planning/Engineering and Design Duration Rationale ............................................................. 73 2.5.5 Cost and Feasibility of Marsh Creation and Barrier Island/Headland Projects .................... 74 2.5.6 Construction Elevation for Marsh Creation Projects .................................................................. 76 3.0 Project Attribute Assumptions for Each Project Type ................................................................. 76 3.1 Bank Stabilization (BS) ....................................................................................................................... 77 3.1.1 Bank Stabilization Project Assumptions and Attributes .............................................................. 77 3.2 Barrier Island/Headland Restoration (BH) ..................................................................................... 78 3.2.1 Barrier Island/Headland Project Assumptions and Attributes .................................................. 78 3.3 Diversions (DI) ..................................................................................................................................... 81 3.3.1 Diversion Project Assumptions and Attributes ............................................................................. 81 3.4 Hydrologic Restoration (HR) ............................................................................................................ 83 3.4.1 Hydrologic Restoration Project Assumptions and Attributes .................................................... 83 3.5 Marsh Creation (MC) ........................................................................................................................ 84 3.5.1 Marsh Creation Project Assumptions and Attributes ................................................................. 84 3.6 Oyster Barrier Reef (OR) .................................................................................................................... 86 3.6.1 Oyster Barrier Reef Project Assumptions and Attributes ............................................................ 87 3.7 Ridge Restoration (RC) ..................................................................................................................... 88 3.7.1 Ridge Restoration Project Assumptions and Attributes