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.
On 6 October 1967, 489 mm of rain fell, a Canadian record, but only one-quarter the amount that fell at the world's wettest place, Cilaos, on La Reunion RÃ©union island in The Indian, ocean which recorded 1870 mm on-15 16 march. 1952