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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]].
+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
+!colspan = "2" align = center| B type I
−!colspan = "2" align = center| B II
+!colspan = "2" align = center| B type II
−!colspan = "2" align = center| B III
+!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