Three feet is a lot of snow. Heavy, wet snow.
How much, exactly? Here's a thought exercise: We have some friends in the deeply-affected area of the '013 Blizzard. Their driveway is about 100 ft. long x 6 ft. wide, and is currently covered in 36" (three feet!) of snow.
Quick assumptions: let's assume it's a regular rectangle, and let's say a cubic foot of heavy snow weighs about 15 lbs (7 kg). Thus, we have (100 x 6 x 3) = 1800 cubic feet, which weighs (1800 x 15) = 27,000 lbs. That's 12,000 kilograms, or 12 metric tons.
That's as much weight as five Ford F-150 pickup trucks, or about 10 elephants. Really.
(Time to call for a plow, maybe?)
Best wishes for safety and fast utilities service to those affected in the Northeastern U.S.
-SAO
Hint: If snow is forecast park your car near the street end of the driveway (maybe 10 feet from the street so it doesn't get buried when a plow goes by) so you don't have to shovel all 12 metric tons of snow.
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