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Great flood of 99

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Through Kerala and India

Cause

Kerala state received unprecedented rains during the month of July 1924. Kerala received 3,368 mm of rain during the monsoon season (June to September), 64 percent higher than normal and is the highest recorded rainfall. The flood was probably caused by offshore vortices along the west coast and perturbations higher up in the troposphere and is not attributed to any depression or cyclonic disturbance in the Arabian sea or the bay of Bengal.

The rivers in the state were in spate and a sudden opening of the Periyar sluices caused even greater misery. The restriction in flow due to swelling of the Periyar river, blockages formed by debris, changes in the river flow and other related reasons caused flooding even in places like Munnar which is 1500m above sea level.

A letter from P. John John, owner of tea estates, to the land revenue commissioner stated: "During the last floods my tea estates, Karimkulam and Karimtharuvi, sustained heavy losses and I herewith enclose a statement showing the losses. This was mainly due to the indiscriminate working of the sluice valves of the Mullaperiyar Dam without giving any previous warning. The rainfall all over the country and especially in the Peermade District was unprecedented and the river was already in flood due to these rains and the partial opening of the sluice valves. Then it is said that the authorities found the water level in the lake had risen much over the maximum limit and they opened the sluices to the full height thereby flushing the river.

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