Louisiana Coastal Land Loss Since 1956


Land Area Change in Coastal Louisiana After the 2005 Hurricanes: A Historical Perspective (from 1956) – Full Size Poster

This map only shows land as lost when it is turned to open water. There are large areas of land, such as the area east of New Orleans, that have lost most of their elevation since 1956, but are still just barely above water. They will disappear from the map as go below water, creating the impression of sudden land loss when the reality is that a long term process of subsidence. If you fly over the area or try to walk on this land, it is clear that it is already lost and is just awaiting the final death of the marsh to disappear into open water.

EPA Rejects Corps EIS for Columbia River Coal Terminal


The U.S. Environmental Protection Agency has reviewed the U.S. Army Corps of Engineers’ September 2016 Millennium Bulk Terminals – Longview Draft Environmental Impact Statement (Corps DEIS), (EPA Region 10 Project Number: 13-0034-COE). We conducted our review according to EPA’s responsibilities under the National Environmental Policy Act (NEPA) and Section 309 of the Clean Air Act. Section 309 specifically directs the EPA to review and comment in writing on the enviromnental impacts associated with all major federal actions. Our review of the Corps DEIS considers the expected enviromnental impacts of the proposed action and whether the EIS meets the procedural and public disclosure purposes of NEPA. For the reasons described below, we are rating the Corps DEIS “3” – Inadequate.

Mississippi Delta Subsidence in Action – Fort Proctor

Photo by Marli Miller – marlimillerphoto.com

A visualization of century-scale impacts of subsidence and sea level rise as seen in a time sequence reconstruction at Fort Proctor in St. Bernard Parish, Louisiana

by Chris McLindon

Fort Proctor is a pre-civil war military installation on the shore of Lake Borgne southeast of New Orleans. Historical records state that the fort was constructed 150 feet inland from the shore of the lake just north of the mouth of Bayou Yscloskey. This was also the site of Proctorville, a rail depot at the terminus of the Shell Beach Branch of the New Orleans and Gulf Railroad, which ran along the east bank of the Mississippi River to the town of Poydras, then down the natural levees of Bayou Terre aux Boeufs, Bayou La Loutre and Bayou Yscloskey to the shore of Lake Borgne.

While it can logically be assumed that the original elevations of the fort and the railroad depot were necessarily at least a few feet above sea level, neither of the architectural studies of the fort conducted by Tulane or Louisiana State Universities appear to include any definitive values for the land elevation at the time of construction. The fort is about 1,000 feet from the Shell Beach Continuously Operating Reference Station (CORS) of the National Geodetic Survey. This station is a part of the Global Navigational Satellite System that provides data for the three-dimensional Global Positioning System (GPS) network. In addition to surface positioning data this station provides a measurement of the vertical movement of the earth’s surface, which in this case can be used to estimate a rate of subsidence.

Sea Level Rise Threatens Major US Navel Bases

Kelly A Burks-Copes et al., Risk Quantification for Sustaining Coastal Military Installation Asset and Mission Capabilities (RC-1701) (2014). (original link)


The objective of this project was to develop and test a risk-based methodology to evaluate threats to critical installation assets and quantify the potential loss of mission performance when installation capabilities were impacted by a combination of rising sea levels and coastal storm hazards.


Based on the analysis of NSN’s site-specific vulnerabilities, the project team found sea level rise to be a significant and pervasive threat multiplier to mission sustainability, significantly increasing loadings on built infrastructure, and dramatically increasing risks to system capabilities and service provisioning. Using the framework, the project team was able to identify several critical systems on the study site that were particularly vulnerable and likely to be incapacitated once sea levels rise above 1.0 meter on the site. The results show that the probabilities of damage to infrastructure and losses in mission performance increased dramatically once 0.5 meters of SLR was experienced, indicating a “tipping point,” or threshold, that should be considered when undertaking future planning or operational activities on the installation.

FEMA Standards for Substantial Improvement / Substantial Damage Determinations

FEMA, 2010. Substantial Improvement / Substantial Damage Desk Reference, Federal Emergency Management Agency, Washington, DC

When buildings undergo repair or improvement, it is an opportunity for local floodplain
management programs to reduce flood damage to existing structures. More than 21,000 communities
participate in the National Flood Insurance Program (NFIP), which is managed by
the Federal Emergency Management Agency (FEMA). To participate in the NFIP, communities
must adopt and enforce regulations and codes that apply to new development in Special Flood
Hazard Areas (SFHAs). Local floodplain management regulations and codes contain minimum
NFIP requirements that apply not only to new structures, but also to existing structures which
are “substantially improved (SI)” or “substantially damaged (SD).”
Enforcing the SI/SD requirements is a very important part of a community’s floodplain management
responsibilities. There are many factors that local officials will need to consider and
several scenarios they may encounter while implementing the SI/SD requirements. This Desk
Reference provides practical guidance and suggested procedures to implement the NFIP requirements
for SI/SD.
This Desk Reference provides guidance on the minimum requirements of the NFIP regulations.
State or locally-adopted requirements that are more restrictive take precedence (often referred
to as “exceeding the NFIP minimums” or “higher standards”).

Who has to pay for the MRGO Closure and Wetlands Restoration?

Most Corps of Engineers wetlands projects require the state or other non-federal sponsor to pay for part of the cost. This is both a cost-sharing measure and a measure to make sure that the state really needs the project – without a match, state politicians would demand unlimited projects from the Corps as economic development. Louisiana generally tries to avoid paying the match on projects, but unless Congress passes a law waiving the match on specific projects, the state has to pay for what has been done and nothing new will be done until the state pay’s the necessary match. This dispute arises from the push to close the Mississippi River Gulf Outlet canal after Hurricane Katrina.

A Comprehensive Restoration Plan for the Gulf of Mexico

The Trustees have reached a settlement with BP to resolve BP’s liability for natural resource injuries from the Deepwater Horizon oil spill. Under this settlement, BP will pay up to $8.8 billion for restoration.

Based on our thorough assessment of impacts to the Gulf’s natural resources, we selected the comprehensive, integrated ecosystem restoration approach for restoration implementation. This approach is outlined in the comprehensive restoration plan, which will allocate funds from the settlement for restoration over the next 15 years.

Introduction to FEMA’s National Flood Insurance Program (August 2016)

CRS – Congressional Research Service Paper: Introduction to FEMA’s National Flood Insurance Program (August 2016)


The NFIP was established by the National Flood Insurance Act of 1968 (NFIA, 42 U.S.C. §4001 et seq.), and was most recently reauthorized by the Biggert-Waters Flood Insurance Reform Act of 2012 (Title II of P.L. 112-141). The general purpose of the NFIP is both to offer primary flood insurance to properties with significant flood risk, and to reduce flood risk through the adoption of floodplain management standards.

Suburban sprawl and poor preparation worsened flood damage in Louisiana

Suburban sprawl and poor preparation worsened flood damage in Louisiana

An excellent post by Professor Craig Colten on the events leading to the August 2016 flood:

Reports of flooding in Louisiana may conjure up images of Hurricane Katrina, but these rivers are completely separated from the Mississippi River, and these floods posed no threat to New Orleans. Nonetheless, based on my experience studying risk and resilience in this region, I see parallels between the damage of current flooding and the damage caused by Katrina. In both cases, human decisions magnified the consequences of extreme natural events. Planning and permitting enabled development in areas that had experienced repeat floods, and agencies had failed to complete projects designed to mitigate flood damage before the storms hit.

FEMA Proposes New Rules On Elevation for Rebuilding After Flooding

44 CFR Part 9 – Updates to Floodplain Management and Protection of Wetlands Regulations To Implement Executive Order 13690 and the Federal Flood Risk Management Standard; Proposed Rule

Executive Summary

The Federal Emergency Management Agency (FEMA) is proposing to amend 44 CFR part 9 “Floodplain Management and Protection of Wetlands” and issue a supplementary policy to implement the Federal Flood Risk Management Standard (FFRMS) that was established by Executive Order 13690.

Louisiana Flood of 1983 – Suing the State for Causing Flooding

The mayor of Walker, a small town near Baton Rouge that flooded in the August 2016 flood, wants to sue the State of Louisiana for flooding caused by the recent expansion of federal highway I12. (While the Federal Department of Transportation funds highway construction, the designed and construction is done by the state and its contractors.) A class action lawsuit was filed against the State after the 1983 flood, alleging that a different stretch of I12 blocked the drainage for a group of homeowners and caused them to flood. The plaintiffs were successful and won a sizable verdict against the state. Unfortunately, in Louisiana, there is no way to enforce a state court judgment against the State, so the plaintiffs were never able to collect the judgment.