The Hohokam were the only culture in North America to rely on irrigation canals to supply water to their crops. In the arid desert environment of the Salt and Gila River Valleys, the homeland of the Hohokam, there was not enough rainfall to grow crops.
In the olden days in Mesopotamia, there exist seasonal changes, which results in periods of abundant rainfall, which sometimes leads to flooding of some areas in the region, as well as a period of drought caused by less to no rainfall every year. Consequently, the settlers of Mesopotamia formulated the idea of building levees and reservoir basins to keep water during abundant rainfall, which is then used to protect crops from seasonal droughts.
Hence, Mesopotamian settlers create levees and reservoir basins to protect crops from seasonal droughts.
