Areas Most Impacted: Exists citywide, but groundwater depth varies depending on rainfall and snow melt.When the ground becomes saturated, groundwater may seep through the floors and walls of basements.Areas Most Impacted: Chestnut Hill, Roxborough, Andorra, Germantown, Torresdale. Overland runoff can also lead to flash floods. Some areas of Philadelphia experience overland flooding due to the absence of sewers. This flooding can be made worse when sewers can’t handle the volume.
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