The gross storage capacity of the dam is 32 million cubic meters (1.13 tmc ft).

The inflow of the Poringalkuthu reservoir is contributed partly from the tailwater of upstream Sholayar HEP.

In addition, the reservoir receives water from catchments downstream of the Parambikulam and Thunakadavu dams of the PAP Project.

The water from the Poringalkuthu reservoir is diverted through a water conductor system to two Powerhouses of the Poringalkuthu Hydro Electric Project (PHEP) & Porigalkuthu left bank Extension scheme located on the left bank of the Chalakudy River.

After power generation, water from Peringalkuthu & PLBE is released to the Chalakudi River.