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.
The national weather service for Ottawa, Canada is reporting Tuesday 23 rd January to be the wettest day in the coming week with around 8.70mm (or 0.3 inches) of rainfall. Make sure to carry an umbrella if you are out and about in Ottawa, Canada.