The Kaveri River: From Abundance to Scarcity

 The Bhavani River originates from the Western Ghats in the Nilgiris district and connects with the Kaveri River at Erode district. Similarly, the Noyyal River starts from the Western Ghats in Coimbatore district and joins Kaveri at Karur district. The Amaravathi River also from the Western Ghats, merges with the Kaveri.

The Kaveri River, originates from Thalai Kaveri in Karnataka district. It enters Tamil Nadu at Mettur, flows through Trichy and Tanjavur, and finally meets the sea near Poompuhar in the Mayiladuthurai district.

During the Chola Kingdom era, with Tanjavur as their capital, rulers faced severe floods from the Kaveri. To mitigate this, they constructed the Kallanai Dam in Trichy and created the man-made Chembarampakkam Lake to divert water. This lake now supplies water to Chennai. They also built around 18 check dams on the Noyyal River to control its flow, aiding groundwater recharge in the region. These ancient efforts showcase the immense water flow of the Kaveri during that period, benefiting multiple districts in Tamil Nadu.

However, today, the Kaveri River often runs dry for most of the year, with water flowing for only a couple of months. The main cause is the exponential population growth from the Chola period to the 21st century, increasing the demand for water for domestic, agricultural, medical, and industrial needs. This led to more water storage infrastructure, resulting in minimal water flow in Kaveri.

While the Cholas constructed storage mechanisms to divert water, modern-day constructions cater to the growing water demands of the region. Water from Kaveri now even serves Bengaluru's needs. The Mettur Dam on Kaveri and multiple dams on Bhavani River, such as Bhavanishagar Dam, support cultivation in dry regions like Erode. Similarly, Noyyal River's water is stored in Srivani and Malampuzha dams, with Malampuzha Dam's water fully utilized by Kerala. Amaravathi River also sees dam constructions. Rising population and increased food demand further stress water resources, with originating districts storing water locally to meet their needs.

As our population continues to grow, we face even greater water demands in the future. To address this, we might need to commercialize technologies that convert seawater to fresh water and think beyond traditional methods.

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