Short answers, pulled from the story.
Sextus Julius Frontinus (c. 40-103 AD) was a Roman civil engineer, soldier, senator, and author. He served as a military governor of Britain, held the consulship three times, and was appointed supervisor of Rome's aqueducts by the emperor Nerva in 97 AD.
De aquaeductu is a two-volume official report Frontinus wrote for the emperor on the state of Rome's aqueducts. It covers the history, dimensions, discharge rates, and water quality of all nine aqueducts operating at the turn of the first century AD, as well as the laws governing their use and maintenance.
Frontinus documented nine aqueducts: the Aqua Marcia, Aqua Appia, Aqua Alsietina, Aqua Tepula, Anio Vetus, Anio Novus, Aqua Virgo, Aqua Claudia, and Aqua Augusta. He described the quality of water from each based on its source, whether river, lake, or spring.
Frontinus served as governor of Britain, where he subjugated the Silures of South Wales and is thought to have campaigned against the Brigantes. He was succeeded by Gnaeus Julius Agricola in 77 AD.
The Strategemata is a Latin collection of military stratagems drawn from Greek and Roman history, compiled by Frontinus for the practical use of generals. It draws on his own experience under Domitian in Germania and on earlier Roman writers including Valerius Maximus and Livy. The authenticity of its fourth book has been challenged by scholars.
Frontinus began by commissioning maps of the entire aqueduct system, then conducted meticulous surveys of intake and output for each line to expose discrepancies caused by illegal pipe tapping. He introduced lead pipe stamps bearing owner names to prevent further theft and reviewed the existing laws governing the state aqueducts.