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<br>d = Stone reservoir depth (m)
<br>d = Stone reservoir depth (m)
<br>V<sub>r</sub> = Void space ratio for aggregate used (typically 0.4 for 50 mm clear stone)
<br>V<sub>r</sub> = Void space ratio for aggregate used (typically 0.4 for 50 mm clear stone)
</p>
<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>
<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>