CIVTECH 3CS3 Lecture Notes - Lecture 3: Disinfectant, Aquifer, Hepatitis
Document Summary
Water is in the air and in our body (60% of our body) Earth is a water planet and is 71% percent of it is covered with water. However this water is mostly salt water and this limits its usages and more expensive to use the limited fresh water. To convert salt water to drinking water is expensive, corrosive and difficult to do. Water changes the surfaces of the earth (e. g. hill, valley, canyons) due to erosion of the soil, rain, weathering. Human usage: withdrawal total amount of water removed from a river, lake or aquifer for any. It is also used to remove and dilute wastes and pollutants purpose. In 2025, humans would have consumed 70%-90% of available surface water: raises two questions: 1) how much water is available and 2) what is the quality of available reliable water. Globally, there is a very low amount of fresh water available.