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<p>The depth of an infiltration facility is dependent on the native soil infiltration rate, porosity (void space ratio) of the [[Reservoir gravel|gravel storage layer]] and the targeted time period to achieve complete drainage between storm events. The depth of the reservoir for designs <em>without an underdrain</em> can be calculated using the following equation:</p>
<p>The depth of an infiltration facility is dependent on the native soil infiltration rate, porosity (void space ratio) of the [[Reservoir gravel|gravel storage layer]] and the targeted time period to achieve complete drainage between storm events. The depth of the reservoir for designs <em>without an underdrain</em> can be calculated using the following equation:</p>
<strong>d = (i × t<sub>s</sub>)/ V<sub>r</sub></strong>
<strong>d = (q × t<sub>s</sub>)/ V<sub>r</sub></strong>
<br>
<br>
<p>Where:
<p>Where: