Changes

Note that in most cases the results of this calculation will be very similar to those from the equation below assuming 3 dimensional drainage.

Note that in most cases the results of this calculation will be very similar to those from the equation below assuming 3 dimensional drainage.

==To calculate the required storage reservoir depth, where the area of the facility is 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 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:

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>