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Line 52: Line 52:  
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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