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<br> d = Stone reservoir depth (mm)
<br> d = Stone reservoir depth (mm)
<br> q = Infiltration coefficient for native soils (mm/hr) (See [[Infiltration#Planning|Infiltration]] for details on measurement and safety factors)
<br> q = Infiltration coefficient for native soils (mm/hr) (See [[Infiltration#Planning|Infiltration]] for details on measurement and safety factors)
<br> V<sub>r</sub> = Void space ratio for aggregate(typically 0.4 for 50 mm clear stone)
<br> V<sub>r</sub> = Void space ratio for aggregate (typically 0.35 for clear angular stone)
<br> t<sub>s</sub> = Time to drain (48 hour recommended)
<br> t<sub>s</sub> = Time to drain (48 hour recommended)
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<p>The ratio of impervious drainage area to infiltration area should be between 5:1 and 20:1 to limit the rate of accumulation of fine sediments and clogging.</p>
The ratio of impervious drainage area to infiltration area should be between 5:1 and 20:1 to limit the rate of accumulation of fine sediments and clogging.</p>
[[category: Infiltration]]
[[category: Infiltration]]
[[category: modeling]]
[[category: modeling]]