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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]].  
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Particular care should be made to avoid any use of granular B type II or Select Subgrade Material (SSM). Both of these materials are permitted to have a higher proportion of fines in the distribution.
    
{| class="wikitable"
 
{| class="wikitable"
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!rowspan = "2" align = center| Sieve size (mm)  
 
!rowspan = "2" align = center| Sieve size (mm)  
 
!colspan = "2" align = center| A  
 
!colspan = "2" align = center| A  
!colspan = "2" align = center| B I  
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!colspan = "2" align = center| B type I  
!colspan = "2" align = center| B II  
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!colspan = "2" align = center| B type II  
!colspan = "2" align = center| B III
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!colspan = "2" align = center| B type III
 
!colspan = "2" align = center| M
 
!colspan = "2" align = center| M
 
!colspan = "2" align = center| O
 
!colspan = "2" align = center| O
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