When the original runway 24(L) was built
back in 40`s the threshold was at top of hill but as extensions were added at threshold they ran down the otherside of the hill and I guess that at the time these extension were put in it wasn`t seen as a problem but as speeds and weights increased this came back to haunt them,
as I have seen it catch a few people out over the years as landerds have floated down the hill so to speak
G-I-B