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To calculate the required depth:
To calculate the required depth:
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
Where:
Where
<math>a=\frac{P}{x}-\frac{i I}{q}</math>
<math>a=\frac{P}{x}-\frac{i I}{q}</math>
and  
and  

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