#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.
−
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: