I saw yesterday this old recorded from Arte channel and interesting documentary about the Nabateans and among others their sofisticated water supply system...
http://boutique.arte.tv/f10300-monuments_eternels_petra_capitale_desert
As I got interested about something I didn't know in depth until now, I did some quick research on the net...
http://www.ancient-origins.net/ancient-technology/sophisticated-water-technologies-ancient-nabataeans-002193
http://inhabitat.com/how-an-ancient-civilization-flourished-in-the-desolate-arabian-desert-2000-years-ago/
http://www.art-and-archaeology.com/jordan/petra/petra.html
https://www.amazon.com/Petra-Lost-Kingdom-Nabataeans-Taylor/dp/1848850204#reader_1848850204
http://archaeologychannel.us/index.php?Itemid=549&option=com_content&view=article&catid=167&id=824
https://en.wikipedia.org/wiki/Nabataean_Kingdom


Kind regards, Paul.