ENVS131 Lecture Notes - Disinfectant, Water Cycle, Aquifer
Document Summary
It is also used to remove and dilute wastes and pollutants: water moderates climates, human usage: withdrawal total amount of water removed from a river, lake or aquifer for any purpose. Some of this water can be returned to its source: water cycle is one of the most important cycles on the earth and reuses, humans use 54% of the world"s reliable run-off (surface water). In 2025: raises two questions: 1) how much water is available and 2) what is the humans would have consumed 70%-90% of available surface water. and renews water the supply on earth. Some areas have a lot of water but the largest rivers are far from agricultural and population centres. It is very expensive to transport to where it is needed. Lot of precipitation arrives during short periods which cannot and stored because it is very expensive. 64% of available water is used for industrial purposes such as power plant cooling.