The eastern and western stands of Beijing National Stadium are higher than northern and southern stands. This is in order to improve sightlines. A 24-hour per day rainwater collector is near the stadium. After water is purified, it is used throughout and around the stadium. Pipes were placed under the playing surface to gather heat in the winter to warm the stadium and coldness in the summer to cool the stadium. The stadium's design originally could fit until 100,000 people in their maximum capacity.During the bulding phase, near 9,000 seats were removed from the design due the security and logistics factors. After the 2008 Summer Olympics,a near batch of another 11.000 temporary seats were removed. Now the stadium can support a maximum public of 80.000 people.
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