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.
Although Vancouver has a reputation for rain, it actually ranks as the 9th rainiest location in Canada with Prince Rupert, Port Alberni, Chilliwack, Abbotsford, Campbell River, Halifax, Sydney, and St. John's beating Vancouver for average yearly rainfall.