Haussmann and Belgrand built new sewer tunnels under each sidewalk of the new boulevards. The sewers were designed to be large enough to evacuate rain water immediately; the large amount of water used to wash the city streets; waste water from both industries and individual households; and water that collected in basements when the level of the Seine was high. Before Haussmann, the sewer tunnels (featured in Victor Hugo's "Les Miserables") were cramped and narrow, just high and 75 to 80 centimeters (2 ft 6 in) wide. The new tunnels were 2.3 meters (7 ft 6 in) high and 1.3 meters (4 ft 3 in) wide, large enough for men to work standing up. These flowed into larger tunnels that carried the waste water to even larger collector tunnels, which were high and wide. A channel down the center of the tunnel carried away the waste water, with sidewalks on either side for the "égoutiers", or sewer workers. Specially designed wagons and boats moved on rails up and down the channels, cleaning them. Belgrand proudly invited tourists to visit his sewers and ride in the boats under the streets of the city.