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Just in case it's very, very wet, here are the sporting regulations which govern the start:

38.16
Only in the following cases will any variation in the start procedure be allowed :
a) If it starts to rain after the three minute signal but before the race is started and, in the opinion of the race director teams should be given the opportunity to change tyres, the abort lights will be shown on the Line and the starting procedure will begin again at the ten minute point.
b) If the start of the race is imminent and, in the opinion of the race director, the volume of water on the track is such that it cannot be negotiated safely even on extreme-weather tyres, the abort lights will be shown on the Line and information concerning the likely delay will be displayed on the timing monitors. Once the start time is known at least ten minutes warning will be given.
c) If the race is started behind the safety car, Article 40.16 will apply.

40.16
In exceptional circumstances the race may be started behind the safety car. In this case, at the ten minute signal its orange lights will be turned on. This is the signal to the drivers that the race will be started behind the safety car. When the green lights are illuminated the safety car will leave the grid with all cars following in grid order no more than ten car lengths apart. There will be no formation lap and race will start when the green lights are illuminated.
Overtaking, during the first lap only, is permitted if a car is delayed when leaving its grid position and cars behind cannot avoid passing it without unduly delaying the remainder of the field. In this case, drivers may only overtake to re-establish the original starting order.
Any driver who is delayed leaving the grid may not overtake another moving car if he was stationary after the remainder of the cars had crossed the Line, and must form up at the back of the line of cars behind the safety car. If more than one driver is affected, they must form up at the back of the field in the order they left the grid.
Either of the penalties under Articles 16.3a) or b) will be imposed on any driver who, in the opinion of the Stewards, unnecessarily overtook another car during the first lap.

Full regulations are here: http://argent.fia.com/web/fia-public.nsf/16A57B4C6E078BC7C12573FB00429D39/$FILE/1-2008%20F1%20SPORTING%20REGULATIONS%2022-02-2008.pdf?Openelement