Planning Tool to Support Louisiana's Decisionmaking on Coastal Protection and Restoration

Technical Description

by David G. Groves, Christopher Sharon, Debra Knopman

View related products

Download

Download eBook for Free

Full Document

FormatFile SizeNotes
PDF file 1.2 MB Best for desktop computers.

Use Adobe Acrobat Reader version 7.0 or higher for the best experience.

ePub file 7.7 MB Best for mobile devices.

On desktop computers and some mobile devices, you may need to download an eBook reader to view ePub files. Calibre is an example of a free and open source e-book library management application.

mobi file 9.3 MB Best for Kindle 1-3.

On desktop computers and some mobile devices, you may need to download an eBook reader to view mobi files. Amazon Kindle is the most popular reader for mobi files.

Summary Only

FormatFile SizeNotes
PDF file 0.2 MB

Use Adobe Acrobat Reader version 7.0 or higher for the best experience.

Purchase

Purchase Print Copy

 FormatList Price Price
Add to Cart Paperback104 pages $27.50 $22.00 20% Web Discount

Research Questions

  1. What mixture of hurricane risk reduction and coastal restoration projects can achieve Louisiana's goals of reducing hurricane risk and stabilizing and rebuilding coastal land, for different budget constraints?
  2. How can an interactive planning tool help decisionmakers develop a comprehensive master plan that meets diverse objectives under significant financial and other constraints?

Abstract

Coastal Louisiana's built and natural environment faces risks from catastrophic tropical storms. Concurrently, the region is experiencing a dramatic conversion of coastal land and associated habitats to open water and a loss of important services provided by such ecosystems. Louisiana's Coastal Protection and Restoration Authority (CPRA) engaged in a detailed modeling, simulation, and analysis exercise, the results of which informed Louisiana's Comprehensive Master Plan for a Sustainable Coast. The Master Plan defines a set of coastal risk-reduction and restoration projects to be implemented in the coming decades to reduce hurricane flood risk to coastal communities and restore the Louisiana coast. Risk-reduction and restoration projects were selected to provide the greatest level of risk-reduction and land-building benefits under a given budget constraint while being consistent with other objectives and principles of the Master Plan. A RAND project team, with the guidance of CPRA and other members of the Master Plan Delivery Team, developed a computer-based decision-support tool, called the CPRA Planning Tool. The Planning Tool provided technical analysis that supported the development of the Master Plan through CPRA and community-based deliberations. This document seeks to provide an accessible technical description of the Planning Tool and associated analyses used to develop the Master Plan.

Key Findings

A planning tool helped develop a range of different alternative comprehensive solutions to Louisiana's coast problems to support deliberation among stakeholders and decisionmakers.

  • Predictive models estimated the effects of a large set of possible risk-reduction projects and restoration projects for two environmental scenarios (one of moderate conditions and another of less optimistic conditions).
  • The Planning Tool evaluated the costs and effects of these projects.
  • The tool used an objective function that selected groups of projects (or alternatives) that maximizes flood risk reduction (in terms of expected annual damage) and land building (in terms of area of land) for several funding scenarios between $20 and $100 billion over a 50-year period.
  • The tool also calculated the following metrics for risk-reduction projects: residual damage at 50-, 100-, and 500-year flood intervals.
  • The tool also calculated the following ecosystem-service metrics for restoration projects: alligator, oysters, shrimp, saltwater fisheries, waterfowl, carbon sequestration, freshwater availability, nutrient uptake, and storm surge and wave attenuation.
  • The tool also considered other decision criteria including: distribution of risk across socioeconomic groups, use of natural processes, sustainability, operations and maintenance costs, support of cultural heritage, flood protection of historic properties, support of navigation, flood protection of strategic assets, support of oil and gas, and restoration of critical landforms.
  • The tool applied four types of constraints when developing alternatives: financial and natural resource constraints, mutually exclusive project constraints, project inclusion and exclusion constraints, and outcome constraints.
  • A process of deliberation with analysis framed and illustrated key policy trade-offs between alternatives in the two scenario types in a future without action and a future with the identified alternative implemented.

Louisiana can significantly reduce hurricane flood risk and stabilize the coastal landscape under favorable future assumptions with the implementation of a 50-year, $50 billion comprehensive master plan.

  • The master plan resulting from this analysis, if implemented, would significantly reduce flood risk under either of the two environmental scenarios.
  • The master plan, if implemented, would stop the loss of coastal land by 2040 and lead to land growth after that under moderate assumptions. Under less optimistic assumptions, land loss would continue but at a significantly slower rate.

Recommendations

  • Louisiana should begin to develop an implementation plan for the 50-year, $50 billion Comprehensive Master Plan for a Sustainable Coast.
  • The assumptions were reasonable for the planning phase but will need more-careful examination as the Master Plan is implemented.
  • In some cases, the combined effect of projects may have consequences not captured by the Planning Tool, so modifications over time to the plan may be necessary.
  • Additional work needs to be done to better quantify the ecosystem and economic benefits of implementing the Master Plan to justify public expenditures.
  • More-significant analysis of its performance under different scenarios and potential adjustments will be helpful to ensure that the sequence of projects ultimately implemented is indeed robust to a wide range of futures.

Table of Contents

  • Chapter One

    Introduction

  • Chapter Two

    Model Description and Assumptions

  • Chapter Three

    Analytic Procedures

  • Chapter Four

    Analyses to Develop the Master Plan

  • Chapter Five

    Conclusions

  • Appendix

    Expert-Adjusted Alternatives

This research was sponsored by the Coastal Protection and Restoration Authority of the State of Louisiana and was conducted in the RAND Gulf States Policy Institute and the Environment, Energy, and Economic Development Program within RAND Infrastructure, Safety, and Environment.

This report is part of the RAND Corporation technical report series. RAND technical reports may include research findings on a specific topic that is limited in scope or intended for a narrow audience; present discussions of the methodology employed in research; provide literature reviews, survey instruments, modeling exercises, guidelines for practitioners and research professionals, and supporting documentation; or deliver preliminary findings. All RAND reports undergo rigorous peer review to ensure that they meet high standards for research quality and objectivity.

Permission is given to duplicate this electronic document for personal use only, as long as it is unaltered and complete. Copies may not be duplicated for commercial purposes. Unauthorized posting of RAND PDFs to a non-RAND Web site is prohibited. RAND PDFs are protected under copyright law. For information on reprint and linking permissions, please visit the RAND Permissions page.

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.