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#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 find 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 require 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>
*''A<sub>p</sub>'' = Area of the infiltration practice in m<sup>2</sup>
*''A<sub>p</sub>'' = Area of the infiltration practice in m<sup>2</sup>
*''d'' = Depth of infiltration practice in m.}}
*''d'' = Depth of infiltration practice in m.}}
==Step 2==
<poem>
The 'bowl' area is simply the depressed elevation of the surface compared to the surrounding areas; a space to permit temporary ponding.
The depth of the bowl would not typically exceed 0.5 m due to safety concerns.
{{Infobox|1=Some jurisdictions or particular sites may demand a lower maximum depth of ponding. It is worth bearing in mind that in most cases this ponded water will only occur once or twice per year.}}
The ponded water within the bowl should drain within 48 hrs. This addresses public concerns about [[mosquitoes]] and reduces the probability of losing vegetation due to saturated growing conditions.
The drainage of the bowl is not usually constrained by the surface infiltration (filter media should drain > 25 mm/hr). The infiltration of water from the bowl is determined by the drainage of the filter media and reservoir into the soils.
</poem>