![]() ![]() A road elevation of six feet would leave three inches on the crown of the road, which is passable by most vehicles. The six- foot road elevation was equivalent to the ADCIRC water surface elevation from a 10-year storm event at that location. The team looked at ADvanced CIRCulation, or ADCIRC, applications that model tides and wind-driven circulation and provide analysis of hurricane storm surge and flooding. During Gustav, the United States Geological Survey stream gauge reading at Mandeville on Lake Pontchartrain was 6.25 feet. They discovered that most roads at or above six feet of elevation did not flood during the event. The project team looked at historical surge information from Hurricane Gustav, which made landfall nearby in 2008, to determine how high to elevate new roads. The project team decided to focus on modifying an existing subdivision ordinance to require higher elevation of roads in new developments. Louisiana Department of Natural Resources and NOAA Office for Coastal Management staff members met with the project team to review the findings and identify new policies and procedures that could be helpful. Louisiana Sea Grant developed a white paper that included findings from the inventory and gap analysis, and examples of actions that local coastal programs could take to enhance resilience. The project team partnered with Louisiana Sea Grant’s Law and Policy Program to conduct an inventory of existing policies, ordinances, and rules and regulations addressing hazard risk reduction, and determine any gaps that could be corrected with new or improved policies. The first step was to build a project team of planning and permit staff members, engineers, coastal program staff members, and department heads. Tammany Parish, the Louisiana Department of Natural Resources, and the NOAA Office for Coastal Management worked together on a five-year strategy to utilize funds from the Coastal Zone Enhancement Program (Section 309 of the Coastal Zone Management Act) to address this need. The community sought to make its coastal zone more resilient to flood events and address this public safety issue. Tammany Parish residents in their neighborhoods and deny emergency vehicles access to provide help. Having good working relationships with parish partners (e.g., planning and permit office staff, engineers, coastal staff, department heads) helped the team both identify realistic goals for the project and accomplish them.įloodwaters resulting from heavy rain or tropical storm events often trap St. ![]() Tammany Parish Council with the proposed ordinance changes earlier in the process might have saved time, since it took five meetings between the council and the planning and zoning commission before the ordinance was approved. The engineer used actual data from Hurricane Gustav to arrive at a practical elevation. Involving a drainage engineer at the beginning of the project was essential in developing a defensible elevation for the ordinance. ![]()
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