I'm in the process of prepping for a paver patio with a retaining wall. I've excavated to at least 9" deep. My concern is the drainage. As you can see, I have clay soil and the patio is surrounded by mostly higher ground. Do you think it's necessary to install a french drain in this pit? I have two options for diverting the water, but I'd like to get feedback on how you might handle this job. I'd really appreciate everyone's input. Please pardon the mess!