Decision to dig open Vs tubewell near Vaigai Dam, Tamil Nadu

Dear India Water Portal,

We have bought some 10 acres of land on the bank of Vaigai River recently. There is a canal running above our land. Just trying to find out as to whether we should dig an open well or a tube well. Please help us as we are planning to go for some organic farming with drip irrigation. This is the location http://wikimapia.org/#lang=en&lat=10.066429&lon=77.663772&z=19&m=b

Thank you

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