Mettur dam is the biggest in the cauvery basin. But if you combine the capacity of KRS and Kabini (both are in cauvery basin) and compare, Mettur dam will be smaller. Also KRS and Kabini store substantial amount of water throughout the year. But in Mettur dam, due to scarcity of water, adequate water is stored only when there is flood in KSR or Kabini reservoirs.
