Answer:
Irrigation allowed for the production of agricultural surplus leading to:
industrialization, urbanization, and economic development.
Explanation:
Irrigation is the artificial control of water for agricultural production of plant resources and food crops. This practice enabled agriculturists and farmers to produce surpluses. With the surpluses, efforts were made to find ways of storing them. This gave birth to industrialization. When industries were formed to carter for the storage and processing of food crops into refined products, it required the gathering of people (laborers) from the rural areas. These congregated into industrial cities and towns. People then started to emigrate their urban dwellings to reside in urban areas.
Pretty sure it is "gold", you know with the California Gold Rush, and 49ers and all that. :)