Pond Boss Forums INTRO Questions & Observations 8" siphon, normal vs siphon mode

Here is a link to an engineering download that should help. If not I got lots of hits with a search.

web page to a site that has a pdf siphon download


Edit: oops. Pipe size starts at 12". Better look further.

The top tool on this page should come close.
water flow calc through a pipe using gravity

I used the calculator and guessed my pond at 40ft of 8" pipe with a 6' drop and came up with about 448 cu ft per minute times 7.5 gal. per cu ft equals 3360 gpm as an example.