Lawn prep before filling to level
My backyard is sloped the wrong way and pools slightly. I would like to have some media dropped back there from a dump truck and spread it out. I think I should use some kind of drainage (crushed stone?) for the base and just a few inches (3-4?) of top soil.
At the deepest, the grade will be raised about 18 inches. This will taper out to no grade increase at all.
Do I need to till the ground before putting down the drainage material?