- The sewer network evacuates 1.2 million cubic meters of wastewater a day, the equivalent of 35,000 milk trucks stretched for 250 miles.
- Every year, enough trash is removed from sewers to cover a football field, nine feet deep.
- They periodically send large wooden balls—just smaller than the diameter of the pipe—through sewer lines to clean out accumulated crud and sand.
- Toilets account for 39% of water used in Paris, followed by dishes and laundry (22%), showering (20%), and cooking (6%). One percent is used for drinking.
- There are 26,000 sewer inspection covers located throughout Paris, every 50 meters.
- If you drop something down a storm drain, you can call 44-75-22-75 and have a cheerful civic employee climb down through the sewer to find your lost item—free of charge.
- 1st - 4th centuries A.D. - Paris had a populations of 6,000 people and water was drawn from the Seine or tributaries. Wastewater was dumped into the earth streets and fields where it eventually met the Seine. Romans did respect their personal hygiene and built an aqueduct to bring fresh spring water into the homes of dignitaries and public baths.
- 5th - 15th centuries A.D. - During the Middle Ages, the city Paris spread out and, with a population of 200,000, it became the most populous city in Europe. The contents of chamber pots were thrown from windows onto the streets below; shouts of regardez l'eau! ("Watch out for the water!") is a theory for the derivation of loo, British slang for toilet. Wastewater would collect on earthen streets, greasing the skids for epidemics like the plague. The overwhelming stench prompted engineers to build "split streets," paved roads with a central gutter in the 13th century, and later building the first covered sewer in 1370—just 300 meters in length. Drinking water still came from the Seine and public fountains fed by aqueducts; demand gave birth to the profession of "water fetcher."
- 15th - 18th centuries A.D. - During the Renaissance, the population of Paris increased slightly to 250,000 by the 16th century, but the population doubled to 500,000 during the 17th. To deal with the exploding amount of waste, Francois 1 (early 16th century) made it mandatory that cesspits be built underneath all buildings. Waste was transported to nearby moats and garbage bins by sewage collectors. King Lois XIV started construction of the main sewer system in the late 17th century. Water supply was the same as during the Middle Ages: fountains, wells, and the Seine. New aqueducts were built and several new pumps, powered by the flow the river, were installed on the Seine. The number of "water fetchers" grew to 20,000.
- 1850 - 1914 - The population of Paris hits 1 million in 1845. Baron Haussmann—civic planner under Napoleon III who sculpted the grand avenues and ubiquitous apartment blocks of "modern" Paris—appointed Eugene Belgrand to head the Water Board. Over the next 50 years, Belgrand oversaw the building of 600 km of aqueducts that brought fresh spring water from the Seine Valley. Still not able to meet demand, water from the Seine was run through large filters filled with sand. Water that Parisians used to drink was relegated to cleaning streets. The profession of "water fetchers" was eliminated with the creation of the General Water Company, which would provide water to private homes with a fee. Sewers were built to collect waste directly from buildings and empty it into the Seine, downriver from Paris. As pollution built, and clouds of methane caused people to move away from the river, Paris constructed 19 square miles of fields outside the city across which the city's raw sewage was spread to be filtered naturally. Vegetable gardens hosted at the site grew vegetables of unnatural size.
Routes in the sewer system have signs for the corresponding street or landmark above it (Bruneseau, however, was the man commissioned by Napoleon to map the sewer network in the early 19th century and this section was dedicated to him—what an honor).
The underground flow of urban runoff.
The educational signage, located over a slowly moving river of brown wastewater. I have never been more fearful of anything falling from my pockets.
One the sewer pipes viewable from the walkways.
A sword recovered from construction work in the sewer.
A pair of recovered swords.
An example of a wooden ball used to clean smaller pipes. As water pressure builds behind it, the ball scrapes the sides of the pipe and pushes the accumulated sand and urban detritus out the other side.
An example of a much larger ball used to clean out the main pipes, which are about 8' in diameter.
A sewer employee uses a bugle to warn his coworkers of heavy rains, which cause floods underground.
Go. Enjoy the bowels of Paris at Musée Égouts. But don't bring a picnic lunch.