Chicken coop flooring

[KJHorton]

What is a good thing to put in the bottom of the coop? To keep it from becoming muddy during summer rains?

 

[aart]

In the coop or the run?
Some pics would help here @KJHorton

 

[KJHorton]

In the run

 

[aart]

Coarse wood chippings from a tree trimmer have worked very well for me....after I managed the runoff from surrounding areas so run wouldn't flood.