Drains, shafts, ducts and trap doors are elements that make up the drainage system of a built-up area, so the sewers.<\/p>\n
Generally these are found underground and are used to dispose white waters, such as rainwater, and black or waste water, i.e. all the water coming from human, domestic, agricultural and industrial activities that are contaminated by organic and inorganic substances and therefore dangerous for public health and the environment.<\/p>\n
Cleaning the sewerage system<\/strong>, as well as the urban<\/strong> one, is often underestimated but it is absolutely an essential activity that should be performed regularly because neglect and lack of maintenance can prevent it from containing new waste. In addition, debris (which can also be leaves or other urban residues) could obstruct or damage the pipes, sending the entire sewer system into a tailspin, resulting in bad smells and leaks of muddy materials.<\/p>\n<\/div>