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Line 75: − + +
→To calculate the required storage reservoir depth, where the area is fixed or constrained (3D drainage)
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
Where
Where
:<math>a=\frac{Ar}{x}-\frac{i Ai}{x f'}</math>, and <br>
:<math>a=\frac{Ar}{x}-\frac{i Ai}{x f'}</math>
and <br>
:<math>b=\frac{xf'}{nAr}</math>
:<math>b=\frac{xf'}{nAr}</math>