We have lots of grass clippings and leaves that I compost in three piles that I turn with the tractor. There is the ready to use pile, the working pile, and the new pile. We add other compostable items as well, cow and goat manure but not large amounts, The new pile will be around 10 yards this fall after I collect all the leaves. The finished product really makes the garden grow. I am wondering if I should cover the ready to use and working pile? It rains a lot in Oregon and I don't know if nutrients wash out of these piles or not. Will the working pile decompose faster if covered? Maybe this is a moot point since the stuff works so well?