Water in my X5 - Help!

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This must be the same problem I'm having with the drains. The driver's rear trunk compartment (where the amp is) was once again filled with water and I could see a path running along the bottom of the compartment covers towards the rear seat in to never never land (until I tear it all apart). Good thing I haven't bought a new amp yet as that would have fried it again. Also leaked some water in to where the battery is, and strangely the other night my dome light was stuck on. It killed my battery by morning but they started acting normally again later that day. Night before last I walked past the rig and the radio was lit up but I couldn't get it to shut off until I unplugged the battery. I'm thinking the water is probably doing some expensive damage somewhere.