I used to compost big time. But, the county I live in (Yolo- yes, it's real, and I hate the fact that my phone autocorrects to 'YOLO' all caps) has one of the best greenwaste disposal plans in the country. They use the greenwaste to cover trash in the dump. Then they run pipes through it, and let everything breakdown. The pipes are there to harvest methane, which is then used to generate electricity. It's a really good system- so in order to avoid the mice in my compost pile, I now send my greenwaste to the landfill.
I do live in California, and of course you've heard about our droughts. (Rain runoff? What's that?!?!) And I was a huge proponent of peeing in the compost pile. Mainly because it's just convenient- no dirty shoes in the house. But think of the water savings! But I think that cemented my place in the hippie hall of fame for my neighbors.
But really- just imagine saving 4-5 flushes per day, AND adding to the compost pile. AND keeping the compost pile wet. Do you know what a dry compost pile looks like? It's a museum of old leaves...wouldn't make sense to use the hose to put good water on the pile, then flush the toilet all day long. (Okay, possibly too much info, but hey, we talk chicken poop here)
But for the runoff, my mind is working on that...possible gutter. Possibly just rocks on the ground. Maybe with a 2x6 to keep most of the splashes out of the coop. (we're only talking about a 3" gap between the coop and the fence)
you do fit right in
