Poonch River at the dam site drains a catchment area of about 3648 km2. River is gauged near Rahman Bridge by WAPDA from where observed hydrological and sedimentation data was procured for the period 1960-2002. Data related to meteorological parameters such as rainfall, temperature, humidity etc., was obtained from the meteorological station being maintained at Kotli by Pakistan Meteorological Service (PMS).

The project is run of the river and therefore, the generation is based on the actual flow in the Poonch river.