My downspouts go along the wall down to the garden level. I will install rain grates below it to collect the water and direct it to the street.
I will make something like that.
I think being buried will prevent it from shifting from people walking over it, right?
Do I need to make it above grade to prevent debris from falling into it? I really have no idea about it, as I always seem those grates on floored areas, never on garden.