Do waterfalls and the water disrupting and bubbling (from splashing) the water add any "turnover" factor in addition to how much water the pump actually moves itself? For example, if I had a 4550 GPH water pump and just had it flowing back into another part of the pond, I'd use 4550 GPH in my water turnover calculations. But, If I had it running off rocks or something similar and "splashing" into the water, does that help or increase the water turnover and/or air movement in the pond? If so, approximately how much does it help? Thanks