For the duration of Napoleon III's reign and a decade afterwards, most of Paris was an enormous construction site. His hydraulic chief engineer, Eugène Belgrand, built a new aqueduct to bring clean water from the Vanne River in the Champagne region, and a new huge reservoir near the future Parc Montsouris. These two works increased the water supply of Paris from 87,000 to 400,000 cubic meters of water a day. Hundreds of kilometers of pipes distributed the water throughout the city, and a second network, using the less-clean water from the Ourcq and the Seine, washed the streets and watered the new park and gardens. He completely rebuilt the Paris sewers and installed miles of pipes to distribute gas for thousands of new streetlights along the Paris streets.