It seems to me that if you put leaves over sand the leaves will break down and mix w/ the sand, eventually making an icky mess. It may not happen soon but eventually it will and you'll have to replace the whole thing.
The OP sounds like he/she just has gravel w/ no sand at all. That IS hard to clean b/c you can't sift out the poop.
W/ a run as small as that, the best plan (IMO) would be a nice thick layer of sand over the gravel and then sifting out the poop as often as possible. See my Mud Eradication Page (link in sig) for suggestions. I use a small horse stall fork to which I have zip-tied hardware cloth--it works like a giant kitty litter scoop and removes all poop from the run sand as well as from the shavings in the coop.
The OP sounds like he/she just has gravel w/ no sand at all. That IS hard to clean b/c you can't sift out the poop.
W/ a run as small as that, the best plan (IMO) would be a nice thick layer of sand over the gravel and then sifting out the poop as often as possible. See my Mud Eradication Page (link in sig) for suggestions. I use a small horse stall fork to which I have zip-tied hardware cloth--it works like a giant kitty litter scoop and removes all poop from the run sand as well as from the shavings in the coop.