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Two reasons: 1. Heavy snowfall may add enough weigt to the roof that it will collapse. That happened last year where I live. 2. Any serious amount of snow on the roof will keep rain from running off, and put a tremendous weight on the roof, and may collapse it. Both of these risks are minimized by shoveling some or all of the snow from the roof.
using 100 year rain fall data
How many inches of rain does Asia get a year?
How many roofs did the roof plumber do in a year?
954 feet a year.
250 cm
A flat roof is a maintenance nightmare year after year. So many people have made that mistake only to later put a pitched roof over the flat roof to avoid any more hassle.
By taking the square footage and the actual pitch of the roof and using a chart that will give you a 10 year frequency (average rain fall) per hr. Also a major factor is if the roof surface is for weather protection only or promenade
345 days
how much rain falls in southern california each year?
52 times a year
The Amazon rainforest gets over 80 inches of rain per year