From the story, the Buddha image had been missing from the temple on two occasions. As a way of paying homage to the image and in hopes that it would not disappear again, the people carried the statue out and bathe the Buddha image in Pasak River at Wat Bot Chanaman pier. The tradition has been practiced until the present day.
The Um Phra Dam Nam ceremony starts from parading the Buddha image around the city. When the clock strikes 13.00 hours, the image is carried to the ritual site in Wat Traiphum for the people to come and pay respects. There will be prayer and then shows and performances in the evening. On the next day, the villagers give food offerings to the Buddhist monks at the temple.
When it is time for the most important practice, the people take the Buddha image out onto a throne in a ritual boat. The place for this ceremony is the pier at Wat Bot Chanaman. The man who is responsible for bathing the image is the governor of Phetchabun province. He will need to take the Buddha image to the river bed and come up and repeat for the other three rounds. It is considered vital to practice this ceremony since the people believe that if the ceremony is ignored, drought will occur.