What systems are in place to keep a city such as New Orleans from flooding?

Floodwalls and levees: New Orleans is protected by a system of floodwalls and levees. These structures are designed to hold back flood waters from the Mississippi River and Lake Pontchartrain. The floodwalls are concrete structures that are built along the riverfront, while the levees are earthen embankments that are built along the lakefront. The city's flood protection system is constantly being upgraded and improved.

Pumping stations: New Orleans has a network of pumping stations that help to clear the city streets of flood waters. These stations are located throughout the city and are activated when the water level rises. The pumps can evacuate a total of 17 inches of rain every 24 hours.

Drainage canals: New Orleans also has a system of drainage canals that help to carry flood waters away from the city. These canals are dug deep and wide, and they are lined with concrete to prevent erosion. The city's drainage system is gravity-fed, which means that the water flows downward due to the force of gravity.

Flood gates: Flood gates are another important part of New Orleans' flood protection system. These gates are installed at the entrances to the city's canals and they are closed when the water level rises. This prevents flood waters from entering the city through the canals.

Floodplain regulations: New Orleans also has floodplain regulations that restrict development in areas that are prone to flooding. These regulations prohibit building in certain areas and they require developers to build structures that are resistant to flood damage.