I would have to agree otto - it's not a ditch. But it is a low lying flat of land well off the beaten path.
I don't even have the link to the thread of the videos I posted of the actual walk from the turnabout to the area the bodies were found, but they are here somwhere. :floorlaugh:
The Wapsi was almost non-existent that year due to drought so I personally believe if this person REALLY knew anything about the Wapsi they likely knew that in that particular year the chances of them being washed away was highly unlikely. HOWEVER, that area is typically very overgrown with no walking path to where the bodies were found and that person may have well been counting more on that than the washing away.
I think in the videos I walked off the distance between the two wreaths that had been placed there - but of course that may or may not be a TRUE representation of where the bodies were found. Everything in the area had been flattened due to the investigation so the representation of how thick with growth and vegetation is not displayed either.
IF this person hauled the girls in already deceased it was a pretty hefty task that would have taken more than what a 2 minute dump along a gravel road would take. Why make such an effort to hide? They don't appear to have been in any hurry with how the disposal was done. It was a LONG walk back to where the girls were found...and to make that trip twice would take some time.
Now, if they were taken there alive? Well then - that may not have taken nearly as long. Just leave them where they fall and walk out.