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Line 1: *Maximum wash loss of 0.5%,*Minimum durability index of 35,*Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions. *Granular material for underdrains should be clear crushed 50 mm diameter stone graded in accordance with ASTM D 2940.*The void space ratio should be 0.4 (or 40%)*A 100 mm layer of smaller grade pea gravel should be laid over the clear stone to reduce the chance of puncture damage to geotextile fabric.
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All aggregates should meet the following criteria:
<ul>
<li>Granular material for underdrains should be clear crushed 50 mm diameter stone graded in accordance with [https://www.astm.org/Standards/D2940.htm| ASTM D 2940].</li>
<li>The void space ratio should be > 0.35 (or > 35%)</li>
</ul>
All gravel should meet the following criteria:
<ul>
<li>Maximum wash loss of 0.5%</li>
<li>Minimum durability index of 35</li>
<li>Maximum abrasion of 10% for 100 revolutions and maximum of 50% for 500 revolutions</li>
</ul>
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[[Category:materials]]
[[Category:materials]]