Fuel tank section drainage

[cliffpaul2]

Does the section below the floor that holds the fuel tank have any drainage? I opened up the hatch that covers the fuel tank and found some old moldy water sitting on top of the tank. This water obviously leaked through the joint between the hatch and the floor, but why would it stay there? Could it be that the drainage channel was foamed in when the tank was installed or reinstalled?

Does anyone have any ideas for modifictions to solve this problem? Unfortunately, the water is always going to get in there because, in my opinion, this cover was poorly designed by Wellcraft.