Changes

[[Image:Deep_well_pump_icon.png|right]]

[[Image:elevated steel reservoir.jpg|thumb|right|250px|Elevated steel reservoir in Uganda. Photo: [http://ugandanwaterproject.com/t/charity Ugandan Water Project.]]]

An elevated steel reservoir stores clean water in a steel tank on a raised stand or tower. The elevation of the tank provides the water pressure to all points in the pressure zone of the distribution system. Tanks may be cylindrical, rectangular or any other convenient shape. For family use, the tank can be made of an old oil drum (duly coated), and the tower of bamboo. For communal needs, elevated steel tanks are often constructed from factory-made galvanized steel elements bolted or welded together. However, even with galvanization, steel tanks are generally more sensitive to corrosion than concrete reservoirs. On the other hand, steel tanks can be built faster and the cost of transporting the material is generally lower, especially when concrete aggregates are not locally produced.