The Three Gorges Dam in China, one of the largest in the world, holds about 39.3 billion cubic meters of water at full capacity — around 39.3 trillion kilograms. When filled, this huge mass of water is moved from lower elevations (e.g., rivers and seas) to a higher inland reservoir.
NASA scientists have calculated that this could:
Shorten the length of a day by about 0.06 microseconds (60 nanoseconds).
Shift the Earth's axis by about 2 centimeters (0.8 inches).
