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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:
→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:
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
:<math>d=a[e^{\left ( -bD \right )} -1]</math>
Where
Where