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→To calculate the required storage reservoir depth where the area of the facility is constrained (1D drainage)
<math>Ar=\frac{iDAi}{nd+f'D}</math>
<math>Ar=\frac{iDAi}{nd+f'D}</math>
==To calculate the required storage reservoir depth where the area of the facility is constrained (1D drainage)==
==To calculate the required storage reservoir depth where the area of the facility is fixed or constrained (1D drainage)==
On densely developed sites, the surface area of the practice may be constrained. In such cases the required storage reservoir depth, d<sub>r</sub> of the bioretention cell or infiltration trench can be calculated based on available surface area, A<sub>p</sub>:
On densely developed sites, the surface area of the practice may be constrained. In such cases the required storage reservoir depth, d<sub>r</sub> of the bioretention cell or infiltration trench can be calculated based on available surface area, A<sub>p</sub>:
:<math>d=\frac{D\left[\left( \frac{Ai}{Ap} \right )i-f' \right]}{n}</math>
:<math>d=\frac{D\left[\left( \frac{Ai}{Ap} \right )i-f' \right]}{n}</math>