I need to identify the source of all flows into a manhole. This means I need to generate a sanitary sewershed. As a first step I need to select all upstream pipes that flow into the manhole. Since the flow direction is already correctly set up on our pipes in GIS, I was hoping this can be done automatically. Is this possible using InfoWorks ICM? I am new to InfoWorks ICM. All our GIS data is already in InfoWorks ICM and a geodatabase.