|Freshwater Resources in Arid Lands (UNU, 1997, 94 pages)|
|1: Fresh water - A scarce resource in arid lands|
In connection with the importation of useful things and conveniences into towns, one must see to a number of matters. There is the water (problem). The place should be on a river, or springs with plenty of fresh water should be facing it. The existence of water near the place simplifies the water problem for the inhabitants, which is urgent. The existence of (water) will be a general convenience to them.
Ibn Khaldun, The Muqqadimah