§ 2.6.1. Probable Maximum Precipitation (PMP)

The probable maximum precipitation (PMP) is defined by the National Weather Service as "theoretically, the greatest depth of precipitation for a given duration that is physically possible over a given storm area at a particular geographical location at a certain time of the year." The TCEQ has completed a statewide PMP Study for Texas to determine appropriate PMP values throughout the state. The study has a spatial resolution of approximately 2.5 square miles and considers variations in topography, climate, and storm types. This study replaces data formerly obtained from Hydrometeorological Reports (HMRs) 51 and 52. The TCEQ web site (above) provides guidance for using an online geoprocessing service to calculate PMP depths for a given drainage basin.

Source: Rule No. 161-19.01 , 3-14-19.