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.
Best Answer: Not shown by percent anywhere just by km3/yr Annually, Canada's rivers discharge 105 000 m3/s, 7% of the world's renewable water supply. Brazil is the country with the most renewable fresh water. Canada is third after Russia. There is a chart but it is too difficult for me to try and set it up on here.