This document provides a summary of developing regional rainfall intensity-duration-frequency (IDF) curves for determining critical return period alert triggers, and compare with pipeline operator-specific QPE monitoring locations for known crossings of potential concern. These IDF curves aid in determining the rainfall depth that has accumulated within a specified period of time. One example of a trigger alert requested by a pipeline operator might be the 100-year return period rainfall at a location upstream of their pipeline crossing in a small watershed.