What was the main reason CAP was built?

The main reason for the construction of the Central Arizona Project (CAP) was to deliver Colorado River water to users in central and southern Arizona. The project was initiated to address the significant water shortages in these areas, driven by the growing population and agricultural needs. By providing a consistent supply of water from the Colorado River, the CAP plays a crucial role in supporting residential, agricultural, and industrial water needs in a region that has historically faced challenges in accessing sufficient water resources.

The project was designed to transport water over a distance of more than 300 miles through a complex system of canals, pipelines, and aqueducts, ensuring that the water could reach areas that relied on it for both drinking and irrigation. This development marked a critical investment in Arizona's infrastructure to secure water availability for its future economic growth and sustainability. The other options, while relevant to various aspects of water resource management, do not capture the primary purpose of the CAP as accurately as providing a reliable water supply from the Colorado River does.