Forward-and-back surge is usually strong in: Do you currently have motorcycle insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question Forward-and-back surge is usually strong in: Answers A holding tank. An unbaffled tank. A leaf tank. Explanation Unbaffled tanks, which have no internal dividers, are the most vulnerable to forward-and-back surge.