I have river gravel under one of my water stations - it was prone to leaks when I first built it (blame me, not the equipment), so I put down a couple inches of it to let the water drain away and keep the birds (the ducks, particularly) from digging in the mud there, as they are want to do.
it is the ONLY place in the whole run I have to periodically spray clean with a hose and high pressure nozzle, and the only place where poops start to stack up and get a whiff of odor.
I would NOT do it again, and plan to rake it out come spring. (its a bit under 3' high there, and a good 4-7' under the hen house (technically, under a 275 gallon tote collecting rainwater from my barn roof), in one of the corners, thus my lack of enthusiasm for doing it now. and, as its in a corner protected by fencing, I have easy access to hose it down once a month or so and has good airflow, so not a breathing problem for the birds. Most likely, I'll pull a bunch of poultry staples, bend the fence out, pull the gravel with a heavy rake outwards, then resecure the fence.
it is the ONLY place in the whole run I have to periodically spray clean with a hose and high pressure nozzle, and the only place where poops start to stack up and get a whiff of odor.
I would NOT do it again, and plan to rake it out come spring. (its a bit under 3' high there, and a good 4-7' under the hen house (technically, under a 275 gallon tote collecting rainwater from my barn roof), in one of the corners, thus my lack of enthusiasm for doing it now. and, as its in a corner protected by fencing, I have easy access to hose it down once a month or so and has good airflow, so not a breathing problem for the birds. Most likely, I'll pull a bunch of poultry staples, bend the fence out, pull the gravel with a heavy rake outwards, then resecure the fence.