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.
Here, the climate is cold and temperate. Toronto is a city with a significant rainfall. Even in the driest month there is a lot of rain. This location is classified as Dfb by KÃ¶ppen and Geiger. The temperature here averages 8.3 Â°C. The average annual rainfall is 785 mm.