Tropical storm Imelda (September, 2019) was the fifth wettest tropical cyclone on record in the continental United States. At one weather station in Jefferson County, Texas, over a meter of rain (43 inches) fell from this single storm. Since the beginning of the 21st century, the Greater Houston area added nearly 2.8 million people. With the additional impervious urban landscape that goes along with all this added population, controlling runoff becomes a major concern. Rain that used to enter the water table through soil instead runs off into the storm-water system and into the bayous.

Using ArcGIS Pro and the newest USA NLCD Impervious Surface Time Series layer, I mapped where the impervious surfaces changed from 2001 to 2016 by using definition queries and raster functions.