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Firstly, all three zones will be sized together within the limited depth to estimate the footprint area of the whole [[bioretention]] facility. To do this the mean void ratio is estimated to be 0.35.
→Step 1
#a layer of [[filter media]] to support plant growth, and
#a layer of [[filter media]] to support plant growth, and
#a reservoir of [[stone]] to store and facilitate [[infiltration]] of additional water.
#a reservoir of [[stone]] to store and facilitate [[infiltration]] of additional water.
Firstly, all three zones will be sized together within the limited depth to estimate the footprint area of the whole [[bioretention]] facility. To do this the mean void ratio is estimated to be 0.35.
To calculate the required facility area or footprint where the depth is constrained:
To calculate the required facility area or footprint where the depth is constrained:
<math>A_{p}=\frac{IiD}{V_{R}d+q'D}</math>
<math>A_{p}=\frac{IiD}{V_{R}d+q'D}</math>