Waterar

: Using AR headsets (like HoloLens) to overlay 3D models of underground water pipes onto a street view for maintenance.

There are several papers on using AR to "see" hidden water infrastructure: waterar

Water that exists as water rights claims in legal documents but not in the real world is known as "paper water". California Water Impact Network : Using AR headsets (like HoloLens) to overlay

: Using sensors to detect ripples in real water and projecting digital "fish" or "waves" that react to the movement. waterar