How can you separate gravel from water?
If you mean you have to move the gravel first instead, then basically a scoop or shovel or bucket with lots of holes in it (smaller than the gravel size you want to keep) works well, if you can let the water drain for a few seconds each scoop. If further drying is required, maybe spreading it in the sun and occasionally raking, or letting more water drain through a grate while transporting, or even heating to remove the water faster.
