The source describes Koshi Bharana as a ritual linked to a particular vow, or Mannat. It mentions a sugarcane canopy, fruits, prasad, and lamps offered between the evening and morning Arghya.
Fulfilling Special Vows: The Koshi Ritual
Koshi Bharana is a distinctive and deeply honored ritual observed during Chhath Puja by families who have committed to a particular vow (Mannat)—commonly for the arrival of a child, the recovery from a serious illness, or a significant personal achievement.
How It Is Performed
During the evening of Sandhya Arghya, families build a canopy from 5 to 7 sugarcane stalks in their courtyard or by the riverbank. Beneath this canopy, earthen lamps (diyas), fruits, and customary Prasad are placed. The diyas remain lit all night until the morning Usha Arghya, representing the enduring flame of steadfast faith.