Hoover dam is America's most famous landmark, completed in 1935. It was the most colossal structure in the world at that time. This great American icon was to be the largest and heaviest dam, producing the largest amount of Hydro electric power in the world. 21000 men took part in its construction and of them 112 laid their lives to complete this megastructure.

These wastes include Liquid, solid or gaseous waste contaminated with radio nuclides generated from invitro (outside) analysis of body tissue/fluid, invivo (body organ imaging) and tumor localizations and investigations and therapeutic procedures. Non-risk waste is that, which is comparable to normal domestic garnage and presents no greater risk, therefore, than waste

Natural drainage pattern is the route through the rain/other water flows following the natural gradient till it reach some final outlet point where it meets a bit larger course of water. Sometimes the construction of new structures in the way of natural drainage causes its blockage which is needed to be avoided. When this drain water flows through its course it may cause the

Photographic surveying is a method of surveying in which plans or maps are prepared from photographic taken at suitable camera stations or photographic is the science of making measurement from photographs. For large scale engineering and redevelopment projects, reconnaissance can be undertake in to a large extend form air photograph. Pollution effects from

Water evaporates from the ocean surface, driven by energy from the Sun, and joins the atmosphere, moving inland as clouds. Once inland, atmospheric conditions act to condense and precipitate water onto the land surface, where, driven by gravitational forces, it returns to the ocean through river and streams.