What was the original purpose of the Cloaca Maxima?

The system was built to drain marshland across the valleys and remove urban effluent, carrying discharge into the River Tiber.

Where does the channel terminate?

The sewer ends at the River Tiber, discharging between Ponte Rotto and Ponte Palatino.

Is the Cloaca Maxima still in use?

Sections of the ancient channel continue to function, carrying rainwater and city runoff into the municipal drainage network.

Who ordered the initial construction of the sewer?

Roman tradition attributes the construction to King Tarquinius Priscus, who used Etruscan workers and plebeians to drain the Velabrum.

Which deity is associated with the Cloaca Maxima?

The name of the sewer relates to Cloacina, an ancient Roman goddess.

How was water supplied to clear the drainage channel?

Roman aqueducts directed runoff into the sewer system after supplying public baths, fountains, imperial palaces, and private residences.

Rome · Italy

Cloaca Maxima: what's nearby, how to get there and when to go · 2026

Residents near the Velabrum live directly over an antique stone conduit that still carries rainwater away from the ancient forum basin.

Cloaca Maxima · CC BY-SA 4.0

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About the place

Rome maintains an ancient network of stone conduits beneath the republican forum.

Etruscan workers and plebeian laborers excavated the initial channel to drain the marshy Velabrum basin between the urban hills. The watercourse began at Forum Augustum and discharged into the Tiber near Ponte Palatino. Builders lined the trenches with brick and flint, then vaulted the canals with masonry as surface land grew valuable.

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Aqueduct overflow from imperial fountains and major public baths flushed the underground stone conduits continuously to clear urban waste. Modern residents still walk directly above functional segments that route storm runoff beneath the Forum Boarium. City engineers linked these preserved galleries to the municipal sewer network to prevent river backwash.

Associations

CloacinaRoman goddess whose shrine honored the sacred status of the civic sewer.
VelabrumAncient marshland reclaimed through systematic stone drainage works.
River Tiber backwashSeasonal river surges push water backward through the subterranean outlets.
Roman aqueductsContinuous surplus water kept the underground channels free of debris.

Facts

Agrippa directed extensive reconstruction and cleaning campaigns throughout the sewer network.
Outflow water from Roman public baths flushed waste directly into the drainage channels.
The main drainage conduit was carved and vaulted with Roman concrete and flint.
Municipal authorities imposed a dedicated resident tax during the papal era to fund tunnel upkeep.

Updated September 9, 2026Source: Wikipedia

Cloaca Maxima: what's nearby, how to get there and when to go · 2026

What is around38

Rome maintains an ancient network of stone conduits beneath the republican forum.

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