US Army Corps of Engineers
New Orleans District

Glossary

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When water breaks through the structure or levee

Located outside the USACE New Orleans District, the trigger point for Phase I and Phase II flood fight events. Measures the height of the river based off of sea level, not river depth.

A single structure with multiple responsibilities. Example, a gated structure with pumps.

Phase I:

                                When the river is above 11ft at the Carrollton Gage.  Preliminary responses activate. Patrols of levees occur twice weekly. Construction within 1500ft of the levees must cease. However, waivers for construction are granted on a case by case basis.

 

Phase II:

                                When the river is above 15ft at the Carrollton Gage. Daily inspections of the levees are mandatory and all construction within 1500ft of the levees must cease, no exceptions.

A gate that can be opened or closed to take in or discard water during a flood event.

An artificial barrier used to restrain water that could rise to extreme/unusual levels. Serves the same function as a levee but with a reduced footprint.

Steel wired baskets filled with sediment and sand used to help divert and prevent flooding during an event. Similar to a floodwall, only temporary.

Hurricane and Storm Damage Risk Reduction System. Infrastructure systems that provide the New Orleans area with a 100 year risk reduction from a storm surge with a 1% chance of occurring.

https://www.mvn.usace.army.mil/Missions/HSDRRS.aspx

 The use of Turf-reinforced mats and concrete slabs to strengthen the levee system for future flood events. Armoring increases the resilience of levees.

https://www.mvn.usace.army.mil/Missions/HSDRRS/Risk-Reduction-Plan/Levees-Floodwalls-Armoring/

A ridge of sediment and materials built to prevent overflow of a river or body of water

https://www.mvn.usace.army.mil/Missions/HSDRRS/Risk-Reduction-Plan/Levees-Floodwalls-Armoring/

Mississippi River and Tributaries project. Designed for flood control and features tributary basin improvements, levee/floodwall installments/upkeep, floodways, and channel improvements/enhancements.

https://www.mvd.usace.army.mil/Portals/52/docs/04_MRT_WEB.pdf

https://www.mvd.usace.army.mil/About/Mississippi-River-Commission-MRC/Mississippi-River-Tributaries-Project-MR-T/

Serve as a drainage conduit for much of New Orleans, usually from surge in Lake Pontchartrain and other major bodies of water.

The breaching of water over a levee or structure passing onto to low-lying areas.

Permanent Canal Closures and Pump Stations. This station closes off the outfall canals.

https://www.mvn.usace.army.mil/Portals/56/docs/PAO/PCCP%20March%202017%20fact%20sheet.pdf

Flooding caused by rainfall.

Trace amounts of water pushed under the levee via the pressure of the water. 

Southeast Louisiana Urban Flood Control Project. Reduces the risk of flood damages due to rainfall in Orleans, Jefferson, and St. Tammany parishes.

https://www.mvn.usace.army.mil/Missions/HSDRRS/SELA/

Large sandbags often dropped from helicopters.

Specific type of floodgate that helps prevent a storm surge from flooding the area behind the barrier.

For example: The Inner Harbor Navigation Canal Surge Barrier in New Orleans East defends against surge from Lake Borgne entering into the IHNC.

West Closure Complex.  The largest pump station in the world. Used to protect West Bank homes from flooding events based on the HSDRRS standards. The structure gates can close off the Harvey and Algiers Canals from storm surge while pumping rainfall drainage from the canals to the other side of the structure.

https://www.mvn.usace.army.mil/Portals/56/docs/PAO/FactSheets/WCC.pdf

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