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→To calculate the required depth, where the area of the facility is constrained (3D drainage)
Line 61:
Line 61:
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
Where
Where
<math>a=\frac{Ap}{x}-\frac{i Ai}{Ap f'}</math>
<math>a=\frac{Ap}{x}-\frac{i Ai}{x f'}</math>
and
and
<math>b=\frac{xf'}{nAp}</math>
<math>b=\frac{xf'}{nAp}</math>