The definition of an Olympic size swimming pool is 10 lanes each 2.5 meters wide, however to prevent the outside lanes being disadvantaged by having to compete with the waves bouncing off the sides of the pool only the middle 8 lanes are ever used.
An olympic size swimming pool has 10 lanes however only the middle 8 lanes are used for competition, with the outside two lanes being used to prevent the swimmers' waves bouncing off the walls
In a normal Olympic Pool there are 10 lanes. I'm not too sure what a semi Olympic pool is!
10- 8 for swimming and two outside lanes to keep the backsplash down
Typically 10 lanes.
i think 12
8 or 6
Both lanes 4 and 5 are highlighted by using yellow lane ropes. The swimmers who compete in these lanes have either the fastest entry times or in the case of the final, the fastest qualifiying times. It is an advantage to swim in these lanes as often they are subject to less water turbulance than others. Spectators also can identify swimmers more easily by the use of the yellow lane markings.