The existing rainfall frequency values were developed in the 1960s and 1970s. Atlas 14 incorporated an additional 4 decades of rainfall data collected by the increased number of rain gages in Texas. In addition, Atlas 14 used improved statistical methods to conduct rainfall frequency analysis. These rainfall frequency values are used for infrastructure design and planning activities under federal, state and local regulations. The values are also used to evaluate flood risks, manage development in floodplains, and delineate floodplain boundaries for FEMA’s National Flood Insurance Program.