Mr.Rao, Kindly dont get carried away by the no. of districts as the total distance a river travels is more meaningful to analyse and with this we can prove, Cauvery certainly doesn't flow in 25% of the total KN's land area (100 miles naturally and 75 miles artificially in KN govt made artificial channel) whereas it flows naturally in 320 miles in TN baring Pondichery. By this, we are quite clear that cauvery flows 1/3rd of its total length in KN and 2/3rd in TN. Karnataka's arid lands are concentrated in the northern and a piece of north east region and not southern and mid Karnataka (barring few patches. Cauvery doesn't come into picture in case of northern and north eastern Karnataka.