Dale:

What is the gph of that 6" pump? A 3" pump moving 14,000 gph would take 11.6 days.

This pump would take 2.7 days running 24/7.
6" 60,000 gph trash pump @ Northern Tool

If the water level in the pond is only 3' higher than the other pond, you would only be able to drop the water level 3' before the levels equalized and the siphon stopped working. (If I'm understanding your ponds correctly)

www.hoosierpondpros.com


http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).