The answer is quite nicely put here. So, 419 TMC means 11865 Million Cubics Meters of water or 11865 Billion Liters of Water!
Its time we changed to SI units fully.
Myopic view of cauvery
Why short sighted? Well everything we do is short sighted isn't it? Better to post with what we think right here right now, rather than think it through, analyze it and then post. For all you know, its better to be short sighted rather than waste time analyzing it. After all, if its good, its karma.