Government of Kerala entrusted Dr. A.K. Gosain of IIT, New Delhi to recommend the value of PMF applicable to Mullaperiyar reservoir and also to carry out flood routing studies. The Institute considered all relevant hydrological aspects and recommended a figure of 2.91 lakh cusecs as PMF instead of 2.12 lakh cusecs endorsed by the CWC. The Flood routing studies carried out revealed that when the PMF impinges the reservoir with water level at 136 ft, the reservoir level would go up to 159.42 ft with one vent inoperative and 158.67 ft with all vents open. Since the water level goes above the MWL of 155 ft and stays there for hours, IIT Delhi has declared that ‘Mullaperiyar dam is hydrologically unsafe’.
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