The pipe is 6" pvc at a maximum flow of about 300 gpm.
At the shore of the pond, I am using about 50gpm of the 300 gpm for another use. This water becomes gravity flow runoff after this use.
The remaining water I have available (max 250 gpm) is reduced from 6" down to 4" pvc under pressure of about 42 psi. That is the water I could pipe to the bottom of the pond if that provided any benefit compared to just dumping it in at the shoreline.
