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The following calculation is used to size the stone storage bed (reservoir) used as a base course. It is assumed that the footprint of the stone bed will be equal to the footprint of the pavement. The following equations are derived from the ICPI Manual <ref>Smith, D. 2006. Permeable Interlocking Concrete Pavements; Selection, Design, Construction, Maintenance. 3rd Edition. Interlocking Concrete Pavement Institute. Burlington, ON.</ref>
The following calculation is used to size the stone storage bed (reservoir) used as a base course. It is assumed that the footprint of the stone bed will be equal to the footprint of the pavement. The following equations are derived from the ICPI Manual <ref>Smith, D. 2006. Permeable Interlocking Concrete Pavements; Selection, Design, Construction, Maintenance. 3rd Edition. Interlocking Concrete Pavement Institute. Burlington, ON.</ref>
===To calculate the maximum total depth of all aggregate layers needed for pavement support and reservoir water storage===
===To calculate the maximum total depth of all aggregate layers needed for pavement support and water storage reservoir===
The equation for the maximum depth of the stone reservoir (''d<sub>r, max</sub>'', mm) is as follows:
The equation for the maximum depth of the stone reservoir (''d<sub>r, max</sub>'', mm) is as follows: