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==To calculate the required depth, where the area of the facility is constrained (3D)==
 
==To calculate the required depth, where the area of the facility is constrained (3D)==
To calculate the required depth:
+
In some very constrained sites, the surface area of the BMP may be limited, in this case the required depth of cell or trench can be calculated:
 
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
 
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
 
Where
 
Where
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and  
 
and  
 
<math>b=\frac{xq}{nP}</math>
 
<math>b=\frac{xq}{nP}</math>
 +
 
==To calculate the required depth, where the area of the facility is constrained (1D)==
 
==To calculate the required depth, where the area of the facility is constrained (1D)==
 
In some very constrained sites, the surface area of the BMP may be limited, in this case the required depth of cell or trench can be calculated:
 
In some very constrained sites, the surface area of the BMP may be limited, in this case the required depth of cell or trench can be calculated:
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