<P> Much of the northern sector of the suburban areas of Metairie and Kenner was flooded with up to 2 to 3 feet (0.6 to 0.9 m) of water . In this area, flooding was not the result of levee overtopping, but was due to a decision by the governmental administration of Jefferson Parish to abandon the levee - aligned drainage pumping stations . This resulted in the reverse flow of lake water through the pumping stations into drainage canals which subsequently overflowed, causing extensive flooding of the area between I - 10 and the lakefront . When the pump operators were returned to their stations, water was drained out of Metairie and Kenner in less than a day . </P> <P> On September 5, 2005, the Army Corps of Engineers started to fix levee breaches by dropping huge sandbags from Chinook helicopters . The London Avenue Canal and Industrial Canal were blocked at the lake as permanent repairs started . On September 6, the Corps began pumping flood water back into the lake after seven days in the streets of New Orleans . Because it was fouled with dead animals, sewage, heavy metals, petrochemicals, and other dangerous substances, the Army Corps worked with the U.S. Environmental Protection Agency and Louisiana Department of Environmental Quality (LDEQ) to avoid major contamination and eutrophication of the lake . </P> <P> Aerial photography suggests that 25 billion US gallons (95,000,000 m) of water covered New Orleans as of September 2, which equals about 2% of Lake Pontchartrain's volume . Due to a lack of electric power, the city was unable to treat the water before pumping it into the lake . It is unclear how long the pollution will persist and what its environmental damage to the lake will be, or what the long - term health effects will be in the city from mold and other contamination . </P> <P> On September 24, 2005, Hurricane Rita did not breach the temporary repairs in the main part of the city, but the repair on the Industrial Canal wall in the Lower 9th Ward was breached, allowing about 2 feet (0.6 m) of water back into that neighborhood . </P>

How many gallons of water are in lake pontchartrain
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