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→To calculate the required storage reservoir depth, where the area is fixed or constrained (3D drainage)
==To calculate the required storage reservoir depth, where the area is fixed or constrained (3D drainage)==
==To calculate the required storage reservoir depth, where the area is fixed or constrained (3D drainage)==
On densely developed sites, the surface area available for the facility may be constrained. In such cases the required water storage reservoir depth of the bioretention cell or infiltration trench, d, can be calculated assuming three-dimensional drainage as follows
On densely developed sites, the surface area available for the facility may be constrained. In such cases the required water storage reservoir depth of the bioretention cell or infiltration trench, d, can be calculated assuming three-dimensional drainage as follows
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
:<math>d_{r}=a[e^{\left ( -bD \right )} -1]</math>
Where
Where
:<math>a=\frac{Ar}{x}-\frac{i Ai}{x f'}</math>
:<math>a=\frac{Ar}{x}-\frac{i Ai}{x f'}</math>