The Great flood of '99 occurred when the River Periyar in Kerala state of India flooded in the month of July, 1924. This is the year 1099 ME in the Malayalam Calendar. As the Malayalam Calendar was popular in Kerala, this flood is generally called the flood of 99.The rain continued for about three weeks. Many districts of the present day Kerala were deeply submerged in water by this flood - From Trichur, to Ernakulam to Idukki, Kottayam even up to Alappuzha and Kuttanad. Even a huge mountain called Karinthiri Malai was washed away by this flood and the road to Munnar also went along with it. As the road to Munnar was lost, a new road from Ernakulam to Munnar became necessary - the present day road from Ernakulam to Munnar was constructed after this.