public static double ComputeFireInitSpreadProb(ActiveSite site, int currentTime)
{
IFireRegion ecoregion = SiteVars.FireRegion[site];
int timeSinceLastFire = currentTime - SiteVars.TimeOfLastFire[site];
double fireInitSpreadProb =
1.0 - System.Math.Exp(timeSinceLastFire * (-1.0 / (double) ecoregion.FireSpreadAge));
return fireInitSpreadProb;
}