If you compare this isotope data from the bore-hole, here is a bore-hole at Ramachandrapuram. You see that you have in the neighbourhood very similar data, which show you that these waters have not been under evaporation effects, under high evaporation effects, very similar - although they are not close by - showing that the ground water in the saturated zone of the weathered part in the granite, has a very similar - in the upstream - a very similar isotopic composition, while in the area of the Nakkavagu river, the composition is different due to evaporation effects, though, what we have found actually in one bore-hole might be also true for these bore-holes at a boundary of the alluvial. The results of a very detailed investigation with the flow meter in the bore-hole at Ramachandrapura can be transfered also to other bore-holes in the neighbourhood of these bore-hole more downstream, at a boundary between the granitic bedrock and the alluvium.

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