I'd think you would never have a waterlogging problem in sandy soil-- maybe if there is a clay layer not far down. But if you can dig 8" without finding water in the hole, there should not be damage to the roses. One thing I would expect on flooded sandy soil is severe depletion of nutrients. A link on another thread suggested fertilizing, especially foliar fertilizing and use of Osmocote-type with trace and minors, or organic mix.

Thank you both. This is so frustrating. Here are some pictures of what I'm experiencing.

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It is starting to rain again as I am posting.
Amy

Pick them off or knock of with a stream of water.Your roses don't need them for the Photo-synthesis process/or is budding there.Not to sweat.Normal shedding.Drives me crazy-I can have all the yeller leaves picked off and next day all the roses of all types will have them.Something triggers this but no one could tell me what.

I agree, it's not a clear sign of waterlogging or anything else. With waterlogging I'd expect to see a pattern of yellow veins. Plants sometimes just drop a few leaves and there may or may not be something wrong that's causing it.

But you are doing good Amy because you wonder why and you look.You will quickly learn what is a problem and what isn't.This yellow leaf drop is your roses[natures] way of keeping a balance between whats going on above and below ground.To keep more leaves than necessary would burden the root system.In your zone[same as mine] you probably think of your roses being evergreen but they drop and shed whats not needed.
A little zone nine trick.We don't want our roses to have bare legs,of course but-
If you remove as much of the lower interior leaves and going nowhere branches as you can without leaving it look skimpy from five feet away the plant will be able to challenge that much more energy where you want it to go.Study your plants and practice and you will be able to get more growth where it counts.

Thanks, Pete. I feel like I learn something every time I visit the forum. You are all such a big help!

My roses look like that and I haven't had too much rain:)

My leaves don't have bs but they do have the yellow veining. It's been raining on and off every day for at least 40 days, totally wild for San Antonio mid summer. Mine are all recently planted bare roots, I didn't think they could get watter logged but ya' learn something new everyday!

40 days and 40 nights, that sounds pretty ominous to me.