<Tr> <Td> Volume </Td> <Td> 2,500,000 L (550,000 imp gal; 660,000 US gal), assuming a nominal depth of 7000200000000000000 ♠ 2 m . <P> 2,500 m (88,000 cu ft) in cubic units . About 2 acre - feet . </P> </Td> </Tr> <P> 2,500 m (88,000 cu ft) in cubic units . About 2 acre - feet . </P> <P> There must be two spaces 2.5 m (8 ft 2 in) wide outside lanes 1 and 8 (in effect, two empty lanes). The length of 50 metres (164 ft) must be between the touch pads at the end of each lane, if they are used . If starting blocks are used, then there must be a minimum depth of 1.35 metres (4.4 ft) from between 1.0 metre (3 ft) from the end of the pool to at least 6.0 metres (20 ft) from the end of the pool . At all other points, the minimum depth is 1.0 metre (3 ft). If the pool is used for Olympic Games or World Championships, then the minimum depth is increased to 2.0 metres (7 ft). </P> <P> At FINA's 2009 Congress, rules were approved for 10 - lane courses for competition, as an alternative to the more traditional 8 - lane course . </P>

How many feet is an olympic size pool