My house has standing water under the deck in the back yard. Its only an inch or two deep and only stays for a couple days after rain. But since December it has rained at least twice a week here. That means almost always we have water up against the brick and cinder block foundation which I'm sure is not good. So I dug a little trench around past the side of the house to the front yard which slopes downward. It does a great job, no more standing water. Now I have a trench right where I wanted to put a patio and I also want my very young kids to be able to play out there. So how do I fill the trench? Drainage rock? Connect PVC pipes to where I want it to drain to? Also if I use the rocks can I put soil and grass seed on top or will this just clog up the flow of H2O? I am a total drainage rookie and would appreciate any and all suggestions.