In track how high are hurdles for a 10 year old girl?

I need to know how high hurdles would be for 10-11 year old girls.|||The hurdles will not go lower than 30 inches, so that is what you have to run.|||I would say it's probably the lowest setting, like in the 300 hurdles in high school track for girls they're really small, I don't do hurdles, i'm 5'2" and even I can clear them.|||10 foot