Sorry, I just noticed this comment!
The ripples only reflect off the edge of the square you are calculating the water for. However, if you want them to reflect off of a specific surface in the middle of the water, you have to make sure the values for the Water Map at those points are always 0. If you don't compute the flow at those point and consider them 0 to all other points, then they will automatically reflect off those areas.
purenickery
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