How many meters is the migration downstream of the upper reservoir of Changsha black mussel pumped storage power station?

400 meters. According to the management regulations of Changsha Reservoir, people are not allowed to live within 400 meters around the reservoir, and it takes at least 400 meters to immigrate to the downstream of the reservoir to ensure that residents are 400 meters away from the downstream of the reservoir, so as to avoid the phenomenon that houses are damaged due to backwater of the reservoir.