Cool Room Question

We bought a walk in cooler from a grocery store and are setting it up for a cool room.  My question is, has anyone used a gravel pit as a base layer for drainage under the floor?  We are thinking we would dig a 2-3 foot pit, fill it with pea gravel, then put a deep layer of cedar fiber on that.  Any input would be appreciated.

We have a cool calf with no floor. And what we did was dig a trench all the way through the cooler and to the outside and put a pipe with down and put river rock around and over it. And then we have a thick base of cedar mulch over top of it.

A couple of individuals I know dug out an area about 2 feet deep.  They filled it back up in this order: approximately 8 inches of gravel, then 8 inches of sand, thin layer of lime, 8 inches of cedar fibers.  The floors soak up the urine very well and the lime helps eliminate the urine smell.  I didn't do it like that when we built our cooler this past spring, did it like cool calf recommended (concrete = costs more).  One benefit regarding concrete is you can covert your cooler to an indoor washrack during the winter.  Cool Calf has a drawing on their website for building a floor for a cooler.

@Sambosu... did the individuals pour concrete footers to sit the cooler on?  We are trying to decide whether to just pour concrete or go the gravel route.

We recently finished our coolroom where we have a concrete floor, then 4 in peat gravel, then black landscape mesh, then 4-5 in cider
Works great to flush out needing every night and yet easy if u want to clear out the cooler completely and u still have concrete floor
The landscape mesh helps keep the gravel separate from the bedding
Good luck

ttt

At first we were going to pour a stem wall for the cooler to sit on and then pour the floor.  The concrete guy recommended pouring it all at once/ monolithic pour.  The cooler is setting next to the edge of the concrete slab and anchored into the concrete. 

How did this work out using gravel? We are currently attempting to build a cool room. We have the panels, just talked to calf cooler and they said the refrigeration would be $18,000... Of course I laughed wildly , thinking cool bot only cost 300-400. Even if I had to run 3 24,000 BTU A/C's brand new worst case $3,000 for refrigeration. Am I wrong in that assumption? We will range from 4 calf's to 8... Depending on the time of year. We really only need to reach a comfortable temperature 65-70 degrees inside the room, as the calves will be going to shows in 100 degree plus heat for fairs and Arkansas youth expo. Last thing we need is a calf having a heat stroke walking out of a 45 degree cooler in 111 degree heat. .. please advise if my thinking is wrong..