Disadvantages of Underground Transmission over Overhead Transmission. 1  Underground transmission line cable is costlier than overhead transmission. 2  The maintenance cost of underground cables is higher than over head transmission. 3  Capital cost of Overhead Transmission lines are cheaper than underground transmission line.
the average annual rainfall for Canada is 60.33 cm. That is alot! Any average is going to be a meaningless because Canada covers over 9 million sq/kms, extending from the Nor â¦ th Pole to below the 49th parallel and both east and west coasts of North America.
Canada has 7% of the world's renewable fresh water. It is easy for Canadians to assume that they have an almost endless supply of clean, fresh water. After all, we're often told that Canada has some 20% of the world's total freshwater resources. However, less than half of this water -- about 7% of the global supply -- is renewable. Most of it is fossil water retained in lakes, underground aquifers, and glaciers. For Canada's 30 million people -- about half a percent of the world's population -- this is still a generous endowment.