Coop Drainage- a data table of mine showing why it's not good to have matted bedding

Hello there, I've been working on this science experiment. I searched EVERYWHERE for some info on coop drainage, but no luck. Except some from Plamondon. 

I would like to show you my data table of drainage rates. The pens are like runs, so rainfall can come in from the south. This shows you how long it takes for 180mL of water to drain through these different kinds of soil. The only pen that gets matted is the one that took 9 minutes to actually drain 180mL of water. Now that's no good because it can cause disease and pooling water mean worms or coccidia. But while testing, I messed up some of the matted soil and it crumbled. Now, if you crumble up the soil, look at the drainage rate. Isn't that amazing? The table got messed up some through the pasting. Enjoy~ 

By the way: If you are interested in doing this experiment for your coop, I'll give the whole sheet of how I worked it. 

ADDED: 3 trials were taken on most, but soon I ran out of the matted places because I messed up the soil too many times. I also estimated that it would take this/that long. 

It means there is a lot of particles packed into a space, (for this experiment) example would be the matting. Low density is not packed, but loose.

Good question. 

The high density pen includes the matted mess, which, yes, refers to the bedding.  

It's and 8 year old pen, and its about a foot deep of matted soil, you can see where there was just dirt (a couple inches down), then fresh shavings(at the bottom), then hay (7 inches down, which made it tough like adobe and made the soil pack together and harden at the top, affecting the permeability of the soil) 

I have been fluffing the soil then throwing pine shavings in the pen, but the chickens always stand right next to the door, so it gets matted. 

I had some hay that got wet in the rain, put it in the coop, it got wet and muddy, turned into adobe, and it matted. Oops! 

I live in California, but we haven't had much rain this year. The soil varies in many locations in my yard, either: rocky, soft, light, harder than concrete, clay like material. Very hard to plant stuff in certain places!