Good early afternoon, fellow by now thawed people. This am was a freezer of cold. Looks like an awesome day compared to the cold this morning. Tuesday is suppose to be bitter cold for us here so you western folks will most likely be really cold. sheesh.
On the question of sand, I have used sand in my runs and all the chickens do is scratch it out mostly. I guess it would work for mud control for awhile. Now others may have had better luck in the long run.... I find that alot of leaves, some sand, mulch, and dirt to build it up helps. again the chicken will scratch it out somewhat. I have permanent runs, plus I open the doors to let my groups free range so that works for me... Turning the dirt every so often helps with the drainage as well...
Again that is what I do, others may do it differently due to their conditions....