Pond Boss Forums INTRO Questions & Observations Siphon Spillway - SDR35 vs Schedule 40

I'm putting in a new siphon spillway on a 0.2 acre pond in northern KY. It collects drainage from about 12 acres of woods and I'm planning to use a 4" pipe.

Are there any recommendations regarding the type of pipe. I've heard some say to use SDR35 and others say to go with Schedule 40.

Input welcome.

Thanks