If it don't leak your good to go. Next spring and summer check the muck at the top you put over everything. Without fabric, much tends to crack from the metal expansion & contraction, as the muck will stiffen over time.
If it cracks water can get under and damn up. Might never happen. Just keep an eye on it.
If it cracks water can get under and damn up. Might never happen. Just keep an eye on it.