Why was it important to always have a canal or waterway next to a field in Mesopotamia?

In Mesopotamia, having a canal or waterway next to a field was crucial for irrigation, as the region's climate was characterized by hot, dry summers and unpredictable rainfall. These waterways allowed farmers to channel water directly to their crops, ensuring they received sufficient moisture for growth. Additionally, canals facilitated trade and transportation, enhancing agricultural productivity and supporting the development of complex societies in the region. This system of irrigation was vital for sustaining the population and fostering economic stability.