Phudung ( Ziding Kho) River, a tributary of Bichom river originates in glacial peaks in Sakteng region of Bhutan in higher Himalayan range at an elevation of 4500m and flows mostly in West- Easterly direction.
The catchment area at the diversion site is 423 km2.
This part of catchment is both rain fed and snow melt.
CWC discharge data available for 23 years.
Design discharge is 22.57 Cumecs