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→To calculate the required depth, where the area of the facility is constrained (3D drainage)
==To calculate the required depth, where the area of the facility is constrained (3D drainage)==
==To calculate the required depth, where the area of the facility is constrained (3D drainage)==
On densely developed sites the surface area of the facility may be constrained, in this case the required water storage reservoir depth of the bioretention cell or infiltration trench can be calculated as follows, assuming three dimensional drainage:
On densely developed sites the surface area of the facility may be constrained, in this case 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=a[e^{\left ( -bD \right )} -1]</math>
Where
Where