Corso Fognaiolo

The sewer takes care of the maintenance of the sewerage system, the complex of channels, generally underground, to collect and dispose of surface water (rainwater, washing, etc.) and waste water from human activities far from civil and / or productive settlements. general. The ducts, in general, work with free surface; in particular sections, depending on the altitude of the inhabited area to be served, their operation may be under pressure (pressure pipes leaving pumping stations, crossings, siphons, etc.). The first historical evidence of sewers dates back to a period between about 2500 and 2000 BC and was found in Mohenjo-daro, in present-day Pakistan. From the remains it was possible to reconstruct the physiognomy of the city which, below street level, featured a vast network of brick canals capable of conveying wastewater from homes. The city of Nineveh, capital of the Assyrian kingdom between the eighth and sixth centuries BC was also equipped with a sewer system. The sources of production of wastewater in an urban agglomeration are mainly homes and usual meeting places such as schools, workplaces, barracks, hospitals, etc. Furthermore, we should not forget the other sources of production, also present in the city fabric, such as small factories, artisan shops, mechanical workshops, garages, laundries, dairies, photographic studios, chemical and analysis laboratories, slaughterhouses, etc., which contribute with discharges of a particular nature, sometimes with a very high polluting rate. Furthermore, there is also the contribution of the markets to