Yep, irrigation is location dependent as annual rainfall varies a lot. New Orleans, Louisiana gets 62 inches of rain per year where Las Vegas gets 4. In many areas water conservation is mostly pointless.

Indoor farming needs to irritate 100% of their needs so they can actually need more irrigation than farms in other areas.

PS: Hawaii is really interesting as it varies so much. With some areas seeing over 25 feet of rain per year. http://rainfall.geography.hawaii.edu/rainfall.html