Considerations above Technologies in the field of watering the crops.

A 2016 study found that countries whose agriculture depended on irrigation are more likely to be autocratic than other countries. The authors of the study "argue that the effect has historical origins: irrigation allowed landed elites in arid areas to monopolize water and arable land. This made elites more powerful and better able to oppose democratization.".(Reference: Bentzen, Jeanet Sinding; Kaarsen, Nicolai; Wingender, Asger Moll (2016-06-01). "Irrigation and Autocracy". Journal of the European Economic Association).

 Indeed, but what about no arable land at all?
The best example history has given us in recent times is the story of Israel, in middle east.
Placed mainly in arid or desertic zones, the jewish tribe has succeded in few years where its previous inhabitants have failed for centuries. It is home to now three types of so called water harvesting technologies, and the inventor of the best water conservative irrigation method was Israelian as well.
In facts, he sold the rights of his technology to an hebrew agency, the drip irrigation by Simcha Blass has become the main business of Netafim. (Reference: Haaretz Article by Ruth Schuster)
Water Harvesing is the practise to find some drinkable water from unconventional solutions to drought. In Israel, alongside with an extensive use of desalination plants, it is common practice to "bomb" the clouds with silver iodine, thanks to guns, once devoted to Anti-Aerial combat. As a result, rain is artificially stimulated so to produce an extra amount of rainy water of about 20% more than without it. Also China, Russia and USA are now exploiting this technology. 

Another technology which serves for water harvesting is about the smart recycle of the waste water.