EESA07H3 Lecture Notes - Hydraulic Head, Transpiration, Water Vapor
17 Sep 2013
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Document Summary
Water is only substance that naturally occur as a liquid , solid, or gas. Earth contains 1. 39billion km3 of water: the oceans make our earth look blue against the black background of the atmosphere. Not evenly distributed and varies season to season and year to year. Such disparities lead to water shortages and the need to do: store water in reservoirs during wet periods, rely on groundwater resources if available, transport water supplies to great distances. Salty or saline (3. 5% dissolved salts by weight; salts are: na, Human tolerance for salt is less than 2: agriculture & industry cannot use salt water. Nearly 97% of earth"s water is salty difficult, expensive to utilize for drinking, agriculture and industry. If all seawater evaporated seafloor will be covered with. 56m of salt (75% of this salt is common table salt naci) Persistent prevailing winds blowing over the ocean produces currents. Prevailing winds generate gyres circular ovean currents.
