Pennsylvania Department of Transportation Storm Intensity-Duration-Frequency Charts PDT-IDF

摘要

Rainfall duration, amount, and intensity are among the major contributors to highway drainage and inundation problems. For the design of any hydrologic structure, ranging from the simplest rational flow rate estimates to the most sophisticated stormwater runoff simulation, design rainfall estimates of acceptable reliability are needed. A statistical analysis of all available continuous hourly and 15-minute duration rainfall records were used to develop an updated procedure for estimating design storms for Pennsylvania. Pennsylvania was divided into five homogeneous regions using the statistically-derived 1-year 1-hour, 1-year 24-hour, 100-year 1-hour, and 100-year 24-hour rainfall duration-intensity storms. A set of rainfall duration-intensity curves were developed for each of the five regions, for seven return periods between 1 and 100 years and durations ranging from 5 minutes to 24 hours.