Researchers find that circular cities get more rain than square ones, and triangular ones get the least.
Rains, landslides have killed 52 people, left more than 100 injured and are affecting more than 27,000 people.
A study of 1,500 regions over the past 40 years shows that economic production is reduced by increased number of wet days and extreme rain.
At least 15 people died during unseasonably heavy rain and flooding in north China's Shanxi province and nine lost their lives after rain across the Philippines flooded villages and triggered landslides.
Hundreds of people evacuated their homes in New South Wales state after authorities warned of "life-threatening" flash floods triggered by heavy rains.
Authorities expected more rains on Tuesday as two days of downpour flooded roads and disrupted rail and air traffic in the financial capital Mumbai.
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