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Solution

The average rainfall in Vancouver for November is 170mm.
Source: http://www.cmc.ec.gc.ca/climate/normals/BCV004.HTM.

The area of Vancouver is 113.1 square km
Source: http://www.city.vancouver.bc.ca/ctyclerk/info_depts_boards/statistics.html.

Raindrop size: raindrop is about 1 cubic mm.
Source: http://www.gi.alaska.edu/ScienceForum/ASF2/236.html
http://wwwga.usgs.gov/edu/raindropsizes.html.

113 * 106 * 106 * 170mm  which is about  1016 = 10000000000000000

David Poole

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