Graph: Patapsco River Near Catonsville July 27 - August 1, 2016

by National Weather Service Advanced Hydrologic Prediction Service

A hydrograph shows how the river level changes over time at a specific location.

Record Flooding - flooding which equals or exceeds the highest stage or discharge at a given site during the period of record keeping.

Major Flooding - extensive inundation of structures and roads. Significant evacuations of people and/or transfer of property to higher elevations.