Short answers, pulled from the story.
King Tarquinius Priscus issued a command to transform the swampy land near the Roman Forum and ordered Etruscan workers and common citizens to begin construction on what would become the Cloaca Maxima. His son Tarquinius Superbus later filled the wet ground with approximately 10 to 20 thousand cubic meters of soil, gravel, and debris.
By the late Roman Republic, the channel had grown to 1,600 meters in length. A specific section measuring 101 meters long became covered and expanded by the second century BC while engineers constructed canals using Roman concrete and flint to ensure durability.
This integration allowed up to ten cubic meters of water per second to move through conduits daily. One million pounds of water, unwanted goods, and waste were carried out to the Tiber River each day.
The final outfall occurred near the Ponte Rotto and Ponte Palatino bridges. The drainage system began its journey at the Forum Augustum and followed natural suburban courses toward the river.
A small sanctuary dedicated to Venus Cloacina stood within the Forum Romanum itself because Romans viewed the movement of water as sacred. The goddess Venus served as the protector of this vital infrastructure throughout history.