Water Towers appear as circular elevated features. This is evident by the shadow signature.
Water Tanks/Water Towers are typically found in residential/urban areas, unlike Storage Tanks which are typically found in industrial/commercial areas.
Water Tanks/Water Towers tend to be solitary, unlike Storage Tanks that are typically concentrated in one area.
Water Towers are typically found in flat areas, the tower is required to be elevated to provide water pressure.
Water Towers may have additional structures mounted on top.