my new home had an old 1/2 hp Sta-rite pump to old galvanized steel line, which ran to 3 spickets. After my dad and I experimented with it for a week, we concluded the lines a had rusted open because we barely got any pressure after putting on a new pump. I met some guys that do irrigation while out doing my lawns, I had them come by and put in 2 wells with double points. Now the Sta-rite shoots the water halfway across the yard. I will be returning the new pump, and start digging trenches to lay the pipes. How deep must I go with the pipes, i've been told anywhere from 6-18"? I was going to run 1 inch pvc from the pump to the valves and from the valves to about 10 teet before the sprinkler and from there I would drop to 1/2 the rest of the way to give enough pressure. Hope this makes sense.