I would hope that if you decided to trap them that you certainly wouldn't drown them...... It's a living, breathing, creature that can suffer and feel pain no matter how much of an annoyance they are.
I would focus on predator proofing your coop and if you're set on trapping, relocating is a much more humane alternative.
I would focus on predator proofing your coop and if you're set on trapping, relocating is a much more humane alternative.