According to Public Works Magazine:

In the past, managers could depend on employees who had worked at the facility for several decades or longer to tell them where various assets were when there was no written documentation in the files. But as these veterans retire, remaining employees have little or no knowledge of where to find these assets.
As-built drawings were scattered about or stored in huge racks with hundreds of other drawings. Finding exactly what they were looking for wasted a lot of employees’ time.

“The core of our program is our GIS, where all information is stored… It now contains more accurate information than the as-built drawings.”

Using the toolbox approach to verify utilities before construction began saved about $175,000 on a $1.5 million fire main replacement.