The following information will help you with determining the total amount of flow you can expect from your pump based on your length of pipe run and elbows.

Here are four pipe run tables courtesy of the Plastics Pipe Institute.

To find your Total Head Loss for your pond plumbing setup (PDF)

Elbow loss and Friction loss in “Feet of Head” for 10 feet of straight schedule 40 pipe (PDF)

Friction loss per 100 feet of plastic pipe (PDF)

Friction Loss in PVC fittings in equivalent feet of straight pipe (PDF)