What is the best approach to prevent a recurrence? Should I cover the window well with a plastic bubble cover? I have an oil tank in the basement and the lines for the oil are too close to the window well to install a standard plastic bubble, and I also have an electric line to attach a gas-powered generator to an electric panel in the basement, that also blocks a standard plastic window bubble cover.
What about caulk under the A/C line penetration in the basement, or dry-lok paint? Any other ideas?
Finally, what does it mean that the wet area on the basement wall still is visible days after the rain stopped?