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[[File:Aggregates Highway 7.jpg|thumb|The fines can clearly be seen on these piles of standard OPSS aggregates for road reconstruction]]
[[File:Aggregates Highway 7.jpg|thumb|The fines can clearly be seen on these piles of standard OPSS aggregates for road reconstruction]]
<onlyinclude>Of the standard granular materials in the standard [http://www.raqsb.mto.gov.on.ca/techpubs/ops.nsf/0/0b9aa4d966cac4f9852580820062909e/$FILE/OPSS.MUNI%201010%20Nov%2013.pdf OPSS.MUNI 1010] only '''Granular O''' is recommended as a substitute for [[reservoir aggregate| clear stone]] in LID construction.
<onlyinclude>Of the standard granular materials in the standard [http://www.raqsb.mto.gov.on.ca/techpubs/ops.nsf/0/0b9aa4d966cac4f9852580820062909e/$FILE/OPSS.MUNI%201010%20Nov%2013.pdf OPSS.MUNI 1010] only '''Granular O''' is recommended as a substitute for [[reservoir aggregate| clear stone]] in LID construction.
{{Textbox|1= Where Granular O is substituted for clear stone in underground reservoir structures, the void ratio used in design calculations shall be '''0.3''' unless laboratory testing proves otherwise.}}
{{Textbox|1= Where Granular O is substituted for clear stone in underground reservoir structures, the porosity used in design calculations shall be '''0.3''' unless laboratory testing proves otherwise.}}
Examples of BMPs with underground reservoirs include [[Underdrains]], [[infiltration trenches]], [[permeable paving]], [[infiltration chambers]], [[exfiltration trenches]].
Examples of BMPs with underground reservoirs include [[Underdrains]], [[infiltration trenches]], [[permeable paving]], [[infiltration chambers]], [[exfiltration trenches]].
Porosity values were calculated based on the coefficient of uniformity (''C<sub>U</sub>'')<ref>Vuković, Milan and Soro, Andjelko Determination of hydraulic conductivity of porous media from grain-size composition. Water Resources Publications, Littleton, Colo, 1992.</ref><ref>Odong, J. (2007). Evaluation of Empirical Formulae for Determination of Hydraulic Conductivity based on Grain-Size Analysis. Journal of American Science, 3(3). Retrieved from http://www.jofamericanscience.org/journals/am-sci/0303/10-0284-Odong-Evaluation-am.pdf</ref><ref>Zhang, S. (2017). Relationship between Particle Size Distribution and Porosity in Dump Leaching. the University of British Columbia. Retrieved from https://open.library.ubc.ca/collections/ubctheses/24/items/1.0357233</ref>:
Porosity values were calculated based on the coefficient of uniformity (''C<sub>U</sub>'')<ref>Vuković, Milan and Soro, Andjelko Determination of hydraulic conductivity of porous media from grain-size composition. Water Resources Publications, Littleton, Colo, 1992.</ref><ref>Odong, J. (2007). Evaluation of Empirical Formulae for Determination of Hydraulic Conductivity based on Grain-Size Analysis. Journal of American Science, 3(3). Retrieved from http://www.jofamericanscience.org/journals/am-sci/0303/10-0284-Odong-Evaluation-am.pdf</ref><ref>Zhang, S. (2017). Relationship between Particle Size Distribution and Porosity in Dump Leaching. the University of British Columbia. Retrieved from https://open.library.ubc.ca/collections/ubctheses/24/items/1.0357233</ref>:
<math>V_{R}=0.255\left ( 1+0.83^{C_{U}} \right )</math>
<math>n=0.255\left ( 1+0.83^{C_{U}} \right )</math>
Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:
Where coefficient of uniformity is the ratio of the 60th and 10th percentile grain sizes:
<math>C_U=\frac{d_{60}}{d_{10}}</math>
<math>C_U=\frac{d_{60}}{d_{10}}</math>