I used to design these things before I retired a few years ago. By the time you finish back filling to level the ground to about 350m past the stop-end . . . you have to figure out how to re-establish grade and make the mound of dirt stable.
Resa,
is there an equivelant F1 type sand/gravel trap design that works for a 747?
Seems that soft ground and grass doesn't help an aircraft get off the ground nor does stop it in short time?
Not the ideal surface for the end of a runway?
Mickjoebill