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→Step 1, total volume
#a 'bowl' permitting water to pond occasionally (maximum depth, ''d<sub>p</sub>'' = 0.5 m)
#a 'bowl' permitting water to pond occasionally (maximum depth, ''d<sub>p</sub>'' = 0.5 m)
#a layer of [[filter media]] to support plant growth (minimum depth, ''d<sub>m</sub>'' = 0.6 m) , and
#a layer of [[filter media]] to support plant growth (minimum depth, ''d<sub>m</sub>'' = 0.6 m) , and
#a reservoir of [[stone]] to store and facilitate [[infiltration]] of additional water (depth, ''d<sub>R</sub>'' includes 0.1 m choking layer).
#a reservoir of [[stone]] to store and facilitate [[infiltration]] of additional water (depth, ''d<sub>R</sub>'', includes 0.1 m choking layer).
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 (''V<sub>R</sub>'') will estimated as ~ 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 (''V<sub>R</sub>'') will estimated as ~ 0.35.