Water resources management in Chile users have to be clearly distinguished from the pricing of water resources. See:Water tariffs in Chile Chile is characterized by irregular distribution of rainfall totals among three distinct climate regions: the Atacama Desert in the northern region, the temperate and Mediterranean central region, and the cold and rainy southern region. The dry Atacama Desert region receives an average of 44.5 mm of precipitation annually while the southern regions receive 3000 mm of annual precipitation on average. According to FAO, average annual precipitation is 1,522 mm with an annual volume of 1,152 km. From this total volume, 884 km will runoff
Flora of the Sonoran Desert absent on the California side of the Colorado River. Desert Holly ("Atriplex hymenelytra") can tolerate even the hottest and driest sites. The area where two vegetation types border, overlap, and transition is called an ecotone. The ecotone between the hotter, drier Colorado Desert and that of the relatively cooler and wetter Arizona Upland occurs from Parker, Arizona southeast to near Phoenix, then south to Organ Pipe Cactus National Monument. Density of vegetation gradually diminishes moving from the Arizona Upland into the Colorado Desert proper. can be found with stems climbing through shrubs and other vegetation, producing "spectacular" floral displays on