Physical site divining is in operation when the diviner gets a reaction in the body to a physical anomaly on the ground while searching. Water divining comes squarely under this category and mineral ores or locating underground pipes on a building site. There's nothing expressly psychic involved in this direct dowsing.
Intuitive divining is in operation when a diviner uses a pendulum and a map searching for a missing person or animal or corrective remedies etc. Here they use traditional divining skills as a way of channel and amplify the intuition. In cases like these, a traditional diviner tunes in to their intuitive sense of what’s on their map or chart. Their divining instruments help them retrieve what they sense inside subconsciously to achieve a successful result in each case.
In practice of course, both physical and intuitive faculties are combined in most divining work. For instance when water divining, on the physical level the diviner's rod on-site reacts directly to the magnetic field of the water line in the ground. Afterwords however, they will also wish to know whether that water is drinkable and how strong the flow might be. For this information they move into intuitive divining as they use the pendulum to answer these important questions.