Calculation of Evaporation loss rate of drilling fluids during drilling/circulation

Dear friends,

I am trying to find a method to calculate evaporation losses of drilling fluid from the tanks during drilling. I have found a graph which relates the evaporation rate with the flow line temperature but it does not consider the surface area of mud tank system. The problem is that number of tanks in the active system and their area has major effect on evaporation rate. that's why I cannot calculate the correct results by using this graph. I would appreciate if someone can help me in this calculation.

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