Flush drain pan ideas?

I’m trying to come up with a stay in place drain pan that will be low profile (out of the way) in the tent. Been looking at pans for washing machines and shit, just curious what everybody else uses. Better ideas?
 
You mean something other than the floor liner that comes with most tents?
Also what size tent is this?
Yes. I’ve found my a answer on here since posting that. Sorry, I’m a nube to the forum world here. Just looking for a draining tray and/or system for flushing. Thanks.
 
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