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mLine 1:
Line 1: <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>{{:feedback}}
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[[Category:materials]]