Adequate Aqueducts

In my study of history, it seems that there are at least two kinds of empires: the conquest empire and the sustainable empire. Famous warrior-kings like Alexander the Great forged conquest empires by marching their armies into foreign lands and conquering everything in sight. Alexander's in particular is an impressive conquest empire, but it fell apart as soon as he died, splintering into petty kingdoms ruled over by his former Generals. Sustainable empires, on the other hand, outlast their conquerors and fall into a pattern of subservience and reliance on their master kingdom. Rome had its share of both over the years, but places like Spain, Germany, Asia Minor, Sicily, North Africa, Greece, and regional Italy itself gradually fell into a permanent territorial status.

How does an army win a battle? Tactics. How does a nation win a war? Logistics. How does a country maintain a far-reaching empire? Engineering. Yes, if there's one thing the Romans had a monopoly on, it was practical engineering. Where the Greeks and Egyptians saw religion, the Romans saw potential. They specialized in making mysterious concepts like pi work for both their citizens and their conquered clients. One of their most amazing achievements was the Aqueduct.

In Rome alone, there was probably 500 km of aqueducts, allowing the city to support a million people. Throughout their empire, they regularly built and maintained these massive pipe and stone structures in order to ensure a potable water supply, as well as control over where the local went and who got to drink. When a city rebelled, step one of retaking it was taking the head of the aqueduct and cutting off their supply. Likewise, when Rome was attacked, the first step in defense was deploying the most elite troops to guard the water supply and ensure that a siege would prove too costly to maintain, especially if the attackers could not find a supply of their own.

In order to build a proper aqueduct, the surrounding land needed thorough surveying and measurement. The angles employed to ensure a 'just-right' flow of water were often very subtle, and the slightest overcompensation in the grade would either slow the supply to a trickle or cause an overflow which could lead to a nasty flood.

It is easy to find remains of the aqueducts in many parts of the ancient empire, including Spain and modern-day Turkey. What we see is only a fraction of what existed, and what still exists beneath our feet. Of all the aqueduct and piping laid by the Romans, most was underground and only a small percentage used those famous arches that we see still standing today.

Pax vobiscum