Replying to To high!

so i'm in the process of building a set up for my back yard. so far i have a 10 ft long 2.5 foot high pvc rail along with a 10 foot up rail that goes from 1.5 ft to 2.5 ft. i built the up rail since i figured the first rail would be to hard to build a jump up to, since i have limited space in my backyard. so far things are looking good and i think the set up will be sick come winter. what is the usual hight, or best hight for a backyard rail