I agree about using the pipe, less water loss to evaporation and to soaking into the soil, and potentially less heating of the water during the summer.

One thing to keep in mind is that every species of fish, plant, algae and potentially any disease or parasite that is in the upper ponds and not in the lower ponds will be in the lower ponds once they are connected.

Conversely, there is a potential for any fish in the lower ponds to swim upstream to the upper ponds using the method that you are proposing.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).