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.
1 Come autumn/ fall temperatures decrease achieving average highs of 13.6Â°C (56.5Â°F) during the day and lows of 6.5Â°C (43.7Â°F) generally shortly after sunrise. 2  Total annual Precipitation averages 1167.3 mm (46 inches) which is equivalent to 1167.3 Litres/m (28.63 Gallons/ft). Vancouver, British Columbia, Canada is at 49 11'N, 123 10'W, 4 m (14 ft). 2  See map. 3  Vancouver, British Columbia has a warm mediterranean/ dry-summer subtropical climate that is mild with dry, warm summers and moderate seasonality.