The interest of the Romans in the water and its preoccupation to have this resource in abundance is a well-known fact, that it has been put of relief by numerous authors. In the metropolis the almost obsessive preoccupation and - prolonged during many centuries- to assure an abundant and continuous water supply still it is clear in the important rest that are conserved there; eleven long conductions with its respective takings (very moved away almost always of Rome to assure water quality), numerous spas (some with huge buildings) and a lot of sources, they always astonish to whom has occasion to observe them or to study them...