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 climate in Canada is typically varies from temperate in south to subarctic and arctic in north. The terrain: mostly plains with mountains in west and lowlands in southeast. For Ottawa in January the daily average maximum temperatures is 0Â°C with the average minimum -9Â°C, while in June the average maximum is 26Â°C with a minimum of 13Â°C. The wettest month for Ottawa is June with an average of 85.4mm of precipitation falling while the driest month is March with 49.3mm falling.