When we built Twisted Dune at the Jersey Shore we capped all the fairways with indigenous sand we gathered on site . Approximately 8-12 inches per fairway . It wasn't quite as expensive for us as we were already shipping tons of material off site daily and we just diverted the sand to the fairways.
Can't really comment accurately on the drainage had we not done so, but the soil profile was bad and I was concerned that we needed a better medium for growth. We were quite unlucky in that despite cutting and removing millions of tons of gravel we just kept hitting more. In a perfect world we would have cut more , which we were able to sell , until we hit sand. Time constraints precluded this .
Despite lots and lots of rain during the final stages of construction the sand never morphed into a slurry, or anything resembling the early stages of concrete. It just didn't . In fact except for the biggest slopes the sand stabilized and held well. The rain did wash out the seed on lots of slopes , and was quite sad to watch . Just reseeded and waited for Mother Nature to give us a break .as any superintendent or growers know , rain is a Godsend , in moderation.