No. It would depend on how high the first partition is. It's got to be lower than or equal to that, and I would make the first partition the height of the recommended skimmer depth if possible. The raised partition simply needs to be able to handle whatever water you are going to push under it. I used a few cd cases to hold up my second panel while it was being glued in. Keep in mind how much the sump is going to fill up when the power goes out too. You need ample room for that extra water.