Anonymous Using experimental methods to calculating the floodwater volume,may give us wrong results. " There's a typo, by the way: "grammatically right/correct " You could use "to" plus gerund as a prepositional phrase: My objection to using experimental methods to calculate (in calculating) the floodwater volume, is that it may give us the wrong result(s). (I use the comma here because the sentence is longer.
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AnonymousUsing experimental methods to calculating the floodwater volume,may give us wrong results.The only glaring grammatical error I see is the hybrid verbal (infinitive/gerund) "to calculating."