Data in support of peak streamflows and flooding in select areas of Pennsylvania from the remnants of Hurricane Ida, September 1-2, 2021

Heavy rainfall occurred across Pennsylvania on September 1 and 2, 2021, as a result of the remnants of Hurricane Ida. Much of eastern and southcentral Pennsylvania received five to ten inches of rain and most of the rainfall occurred in a little more than six hours. Widespread substantial flooding occurred in the area, particularly impacted was the city of Philadelphia and surrounding areas. Flood frequencies were computed for 52 U.S. Geological Survey (USGS) streamgages impacted by the flooding in eastern and southcentral Pennsylvania using peak flow data through 2021. Flood documentation maps showing the extent and depth of flooding from the September 1-2, 2021, event were generated for five communities in southeastern Pennsylvania.