if you have a spare water butt, pop the manhole open, fill the water butt up next to it and tip it in - position the butt so you can just push it over
sudden rush of water like that shifts most stuff - or doesn't go away fast enough and lets you know there's a problem
bonus points if someone tips and someone else watches the other end (if you can get to it?)
sudden rush of water like that shifts most stuff - or doesn't go away fast enough and lets you know there's a problem
bonus points if someone tips and someone else watches the other end (if you can get to it?)
