dams work well in regions with limited rainfall. The indian subcontinent receives most of its annual rainfall during the monsoon. Periods of 100 mm/hour of rain

dams work well in regions with limited rainfall. The indian subcontinent receives most of its annual rainfall during the monsoon. Periods of 100 mm/hour of rainfall are not uncommon. Annual rainfall numbers in southern asia are often 1000 mm. North america's closest regions with that level of rainfall are all west of the rocky mountains. Dams are unlikely to help here and pose a serious risk if they break - which they can in a region prone to earthquakes.