What attempts were made to limit Roman-era water pressure/flow 'theft' by code, pipe length, and expanders and by whom?
score:4
The details from the question align with those found in the report by Roman water commissioner (and former general) Sextus Iulius Frontinus, De Aquis, ca. 100 AD. Here are the relevant sections from the second volume of the publication, taken from the English translation by Charles E. Bennett in the Loeb edition of 1925 as found online at LacusCurtius:
[105] [...] Neither must the deputy permit the free option of connecting directly to the ajutages any sort of lead pipe, but there must rather be attached for a length of fifty feet one of the same interior area as that which the ajutage has been certified to have, as has been ordained by a vote of the Senate which follows:
[106] The consuls, Quintus Aelius Tubero and Paulus Fabius Maximus, having made a report that some private parties take water directly from the public conduits, and having inquired of the Senate what it would please to order upon the subject, it has been resolved that it is the sense of this body: [...] and no one of those to whom a right to draw water from the public conduits has been granted shall have the right to use a larger pipe than a quinaria for a space of fifty feet from the reservoir out of which he is to draw the water. [...]
[112] In some of the reservoirs, though their ajutages were stamped in conformity with their lawful admeasurements, pipes of a greater diameter [than the ajutages] were at once attached to them. As a consequence, the water not being held together for the lawful distance, and being on the contrary forced through the short restricted distance, easily filled the adjoining larger pipes. Care should therefore be taken, as often as an ajutage is stamped, to stamp also the adjoining pipe over the length which we stated was prescribed by the resolution of the Senate.
Paullus Fabius Maximus and Quintus Aelius Tubero held the consulship in 11 BC. As already alluded to in the question, the issue of some water users gaining an unfair advantage by installing a wide-diameter pipe directly after the calibrated outflow of neighborhood storage tanks was addressed by a directive passed by the Roman Senate that limited the diameter of the first fifty feet of pipe after the outflow from the tank to a maximum of about 0.9 inch (= 2.3 cm). This numerical value is derived from section 25 in the first volume:
The most probable explanation is that the quinaria received its name from having a diameter of 5⁄4 of a digit
where a Roman digit is equal to 18.5mm according to Wikipedia
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