Using GIS to Find Population Affecting Outfalls

The Village of Morton Grove, IL was required by the EPA to conduct an analysis of the population affecting the sewer outfalls in the village. The EPA needed to know how many people contributed to each outfall through the village sewer system. Using Geographic Information Systems (GIS), a study was done to find the sewer system pipes that connect homes to each outfall and then compare this to the population of the village.

First, census data was used to find the population of Morton Grove by census block. Then, because the sewer system is connected throughout the village, desktop GIS software was used to derive which homes and areas were connected throughout this system to each outfall. Comparing these two yielded the population that contributed to the drainage from each outfall.

Morton Grove was able to accurately respond to the question posed by the EPA and deliver a map and analysis along with their report. Having an accurate and connected sewer system through GIS was an important aspect to allow this kind of analysis to take place.