What Is JM Eagle's allowable vertical deflection on gravity sewer pipe?

JM Eagle’s SDR 35 PVC sewer pipe has a minimum pipe stiffness of 46 psi. When installed in accordance with the recommendations in our installation guide, this pipe should have a maximum deflection limit for a non-pressure application of 7.5%. Note: this is for ring deflection of the pipe, not axial deflection at the joint.