Final answer:
In the trustee period, water was used for settlements, agriculture, urban development, and managing wastewater, enabled by engineering advances such as aqueducts and irrigation systems.
Step-by-step explanation:
During the trustee period, water was essential for a variety of functions that supported settlements, agriculture, and the economy. Water management systems, including aqueducts, canals, and irrigation networks, provided a reliable water supply for cities, facilitated agricultural development, and allowed for the harnessing of water in arid regions, promoting settlement and commercial growth. Engineering advances specifically were applied to improve access to clean water and manage wastewater, indicating the vital role of water in sustaining communities and enabling development through the ages.