Like many other water bodies and physical features of Kathmandu, the Nagdaha is also steeped in legends. According to one, a male serpent resides in Taudaha and the resident serpent of Nagdaha is female. During the rainy season the male serpent, widely spoken of in ancient scriptures and oral history of Kathmandu as a serpent king, makes a journey to the town of Panauti in order to participate in a festival. It is said that he stays with the female serpent of Nagdaha on his way to and back from Panauti. This union of the nagas, mythical half serpent, half human beings, is followed by heavy rain.