In Ancient Rome, the Aqua Alsietina was the earliest of the two western Roman aqueducts, erected somewhere around 2BC, during the reign of emperor Augustus. It was the only water supply for the Transtiberine region .
This aqueduct acquired water mainly from a lake just north of Rome called Lacus Alsietinus and some from lacus Sabatinus . The length of this mainly subterranean aqueduct was 22,172 paces and had arches supporting 358 paces . Its water supply had a diameter of 392 quinariae .
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