Wastewater Basin E (roughly located in the area southeast of I225 and I70) was experiencing an unaccounted additional flow of 0.75 MGD that was undermining the reliability of Aurora’s InfoSewer model. This project performed a strategic flow monitoring process to identify the source of the additional 0.75 MGD of flow. Through a process of field verification and flow monitoring, this project identified the specific location of infiltration or inflow that was contributing to Basin E Sanitary Sewer overflow. Calibre was able to investigate manholes and flow meters to eliminate excess work and strategically determine the source of the infiltration. To simplify the process and provide cost savings to the client, Calibre combined both in-field visual inspection and GIS monitoring with systematic flow monitoring.