A composite code assigned to each manhole of a sewer system in a geographical region is associated with an x-y location of the manhole on a digitized geographical map of the region containing a representation of the sewer system including manholes plotted thereon. The composite code is stored in a memory of a computer. Other information regarding each of the manholes is entered into corresponding records stored in the memory of the computer. The composite code is utilized as a link between the record for each manhole and the x-y location of each manhole on the digitized map. Utilizing a computer mouse, an x-y location associated with a location of a manhole on a display of the digitized map containing the sewer system is selected. In response to the selection, the record associated with the selected manhole is retrieved from the computer's memory utilizing the composite code. The retrieved record is displayed on the display.