A gas-turbine inlet-air cooling system includes: a spray device configured to spray cooling water into inlet air entered into a compressor of a gas turbine facility to thereby cool the inlet air; and a cooling-water feed system configured to supply the cooling water to the spray device. The cooling-water feed system including: at least one tank configured to reserve the cooling water; a plurality of pipes connected to the tank independently of each other and configured to feed the cooling water to the spray device; and pumps installed for the pipes, respectively.
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