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Sanitation in ancient Rome was a complex system similar in many ways to modern sanitation systems. During the Dark Ages, the technical knowledge of the Roman system was lost and has subsequently been investigated by modern-era historians and archeologists.
The latrines are the best-preserved feature at Housesteads Roman Fort on Hadrian's Wall. The soldiers sat on wooden boards with holes, which covered one big trench. Water ran in a bid ditch at the soldiers' feet.
A system of thirteen Roman aqueducts provided the inhabitants of Rome with water of varying quality, the best being reserved for potable supplies. Poorer-quality water was used in public baths and in latrines, which were an early form of toilet. Latrine systems have been found in many places, such as house steads, a Roman fort on Hadrian's Wall, in Pompeii, Herculaneum, and elsewhere that flushed waste away with a stream of water. Romans used sea sponges on a stick & dipped in vinegar after defecation.
The Romans had a complex system of sewers covered by stones, much like modern sewers. Waste flushed from the latrines flowed through a central channel into the main sewage system and thence into a nearby river or stream. However, it was not uncommon for Romans to throw waste out of windows into the streets, at least according to Roman satirists. Despite this, Roman waste management is admired for its innovation.
It is estimated that the first sewers of ancient Rome were built between 800 and 735 BC. Drainage systems evolved slowly, and began primarily as a means to drain marshes and storm runoff. The sewers were mainly for the removal of surface drainage and underground water. The sewage system as a whole did not really take off until the arrival of the Cloaca Maxima, an open channel that was later covered, and one of the best-known sanitation artifacts of the ancient world. Most sources believe it was built during the reign of the three Etruscan kings in the sixth century BC. This "greatest sewer" of Rome was originally built to drain the low-lying land around the Forum. It is not known how effective the sewers were, especially in removing excrement.
From very early times the Romans, in imitation of the Etruscans, built underground channels to drain rainwater that might otherwise wash away precious top-soil, used ditches to drain swamps (such as the Pontine marshes), and dug subterranean channels to drain marshy areas. Over time, the Romans expanded the network of sewers that ran through the city and linked most of them, including some drains, to the Cloaca Maxima, which emptied into the Tiber River. In 33 BC, under the emperor Augustus, the Cloaca Maxima was enclosed, creating a large tunnel. The Cloaca Maxima, it is presumed, built in the fourth century BC and reconstructed under Augustus), still drains the Forum Romanum and surrounding hills. Strabo, a Greek author who lived from about 60 BC to AD 24, admired the ingenuity of the Romans in his Geographica, writing:
- The sewers, covered with a vault of tightly fitted stones, have room in some places for hay wagons to drive through them. And the quantity of water brought into the city by aqueducts is so great that rivers, as it were, flow through the city and the sewers; almost every house has water tanks, and service pipes, and plentiful streams of water...In short, the ancient Romans gave little thought to the beauty of Rome because they were occupied with other, greater and more necessary matters.
A law was eventually passed to protect innocent bystanders from assault by wastes thrown into the street. The violator was forced to pay damages to whomever his waste hit, if that person sustained an injury. This law was enforced only in the daytime, it is presumed because one then lacked the excuse of darkness for injuring another by careless waste disposal.
Around AD 100, direct connections of homes to sewers began, and the Romans completed most of the sewer system infrastructure. Sewers were laid throughout the city, serving public and some private latrines, and also served as dumping grounds for homes not directly connected to a sewer. It was mostly the wealthy whose homes were connected to the sewers, through outlets that ran under an extension of the latrine.
In general, the poor used pots that they were supposed to empty into the sewer, or visited public latrines. Public latrines date back to the 2nd century BC. Whether intentionally or not, they became places to socialise. Long bench-like seats with keyhole-shaped openings cut in rows offered little privacy. Some latrines were free, for others small charges were made.
According to Lord Amulree, the site where Julius Caesar was assassinated, the Hall of Curia in the Theatre of Pompey, was turned into a public latrine because of the dishonor it had witnessed. The sewer system, like a little stream or river, ran beneath it, carrying the wastes away to the Cloaca Maxima.
The Romans recycled public bath waste water by using it as part of the flow that flushed the latrines. Terra cotta piping was used in the plumbing that carried waste water from homes. The Romans were the first to seal pipes in concrete to resist the high water pressures developed in siphons and elsewhere. Beginning around the 5th century BC, city officials called aediles supervised the sanitary systems. They were responsible for the efficiency of the drainage and sewage systems, the cleansing and paving of the streets, prevention of foul smells, and general oversight of brothels, taverns, baths, and other water supplies.
In the first century AD, the Roman sewage system was very efficient. In his Natural History, Pliny remarked that of all the things Romans had accomplished, the sewers were "the most noteworthy things of all".
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The aqueducts provided the large volumes of water that—after serving drinking, bathing, and other needs—flushed through the sewers. A system of eleven aqueducts supplied the city with water from as far away as the river Anio. Anio Novus and Aqua Claudia were two of the biggest systems. The distribution system was carefully designed so that all waste water drained into the Cloaca Maxima.
The management and maintenance involved in keeping the aqueducts flowing is well described by Frontinus, a general appointed by the emperor Nerva as water commissioner toward the end of the first century AD. He described his work on the distribution system in De aquaeductu published at the end of the first century AD. When first appointed, he surveyed and mapped the entire system, and strove to investigate the many abuses of the water supply, such as the act of tapping into pipes illegally. He also systematized aqueduct maintenance with gangs of specially trained workmen. He also tried to separate the supply, so that the best-quality water went to drinking and cooking, while second-quality water flowed to the fountains, baths, and, finally, sewers.
The system in Rome was copied in all provincial towns and cities of the Roman Empire, and even down to villas that could afford the plumbing. Roman citizens came to expect high standards of hygiene, and the army was also well provided with latrines and bath houses, or thermae. Aqueducts were used everywhere in the empire not just to supply drinking water for private houses but to supply other needs such as irrigation, public fountains, and thermae. Indeed, many of the provincial aqueducts survive in working order to the present day, although modernized and updated. Of the eleven ancient aqueducts serving Rome, eight of them entered Rome close to each other on the Esquiline Hill. Also, the first aqueduct was the Aqua Appia built in 312 BC by the censor Appius. Other aqueducts of importance to Roman sanitation was the Aqua Marcia built between 144-140 BC, which provided large amounts of quality water to Rome. One Aqueduct with some major importance to Rome was Traiana, which tapped from the clear springs of the northern and western slopes above lake Bracciano. It is said that the “Romans fully appreciated the importance of plentiful and wholesome supply of water, for domestic purposes to health of the Community. It was stated by Amulree that for 441 years after the building of Rome, it depended on water from the Tiber for drinking and other domestic purposes, but in 312 BC Appius Claudius Crassus provide Rome with water from the Springs of the Alban hills and brought to consumers by the mean of Aqueducts. The Amulree notes state that this practice is in line with the teachings of Hippocrates: that stagnant water should be refused, not the spring water from the hills or rain water.
Roman rubbish was often left to collect in alleys between buildings in the poor districts of the city. It sometimes became so thick that stepping stones were needed. "Unfortunately its functions did not include house-to-house garbage collection, and this led to indiscriminate refuse dumping, even to the heedless tossing of trash from windows."  As a consequence, the street level in the city rose, as new buildings were constructed on top of rubble and rubbish.
- Aqueduct (Roman)
- Cloaca Maxima
- Roman architecture
- Roman engineering
- Roman technology
- History of water supply and sanitation
- Sanitation of the Indus Valley Civilization
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- The History of Plumbing - Pompeii & Herculaneum
- Waters Of Rome
-  The History of Roman plumbing and sewers
-  Ancient Sewage
- Imperial Rome Water Systems
- WATER AND WASTEWATER SYSTEMS IN IMPERIAL ROME
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