something someone sent to me regarding the possible expansion of the emirates stadium
"The stadium can be expanded and will, it is only a matter of time. This was a pre-required specification of the design to allow it to be future-proof. It was originally designed to be an 80,000 seater stadium with a retractable roof, but because of Islington council objection and time to build as well as cost, it is now at 60,000 capacity. Let us be honest, it is a good jump in size from 38,000 as Highbury was.
The area around the pitch can be utilised for seating if needed and would provide up to 5,000 more seats. For new stadium regulations, this area is required to be free of seating however. This is a good thing as stadiums that will be selected for the 2018 World Cup have to adhere to this rule, eg Wembly as another stadium.
Regarding expanding the stadium, there are a few simple ways this can be done. Emirates Stadium is a four-tiered design, simply adding an extra tier(just like the overlapping tier between the first and second tier) will add the capacity required or simply to keep adding steps to the original stadium as it is, ie increase the steps from the back row.
There are approximately 1,000 seats in the last row of the stadium. If you take an extra 10 steps, then that would be 10,000 seats. Another factor to look at is the height of the stadium. Rules in building it were it had to be of a maximum height, which it is below now anyway as the stadium was built below ground level.
Getting back to the maximum capacity, it would take 40 steps to add 40,000 seats (This is a conservative estimate) and bring the total capacity to over 100,000.
The roof will need to be removed and a new roof replacing it, but as you can see it is not a nightmare architectually speaking."
from:
http://www.bbc.co.uk/dna/606/A32276054
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