Laws intended to protect cemeteries and provide access to the public (mostly descendants and families) have the effect of destroying these cemeteries and they are lost forever. Developers understand that if their construction crews come across an unknown cemetery, they know that they must bring out the bulldozer or the Bobcat and make it disappear in the dark of night. Bury the tombstones and scrape away any signs of its original purpose. Farmers with bushhogs and a front loader have done the same for years.
Yet, if we build a reservoir, we arrange to move the cemeteries to a piece of higher ground with public access and everybody is happy as long as you disinter the bodies and not just move the tombstones. Putting the burden on land owners is a recipe for disaster.
The 1960s Denver water supply dam at Dillon, Colorado featured moving of a fairly large cemetery. The diggers worked out of trailers at the site and food was brought out to them from area restaurants prior to closing the dam.
Maybe we should just bury everyone at sea, even the ones we cremate. ;)