What were the key engineering challenges faced during the construction of the Roman aqueducts project?

The key engineering challenges faced during the construction of the Roman aqueducts project included designing structures that could transport water over long distances while maintaining a consistent downward slope, overcoming natural obstacles such as valleys and hills, and ensuring the stability and durability of the aqueducts over time. Roman engineers had to use innovative techniques and materials to address these challenges and create a reliable water supply system for their cities.