Feedback post on Infiltration trenches
C.Davidson, Golder Associates - The Wiki says "Void Ratio of 0.4", but the Stormtech reference cited says "Porosity of 40%". These are not the same number.
-Porosity = Volume of Voids / Total Volume of Material
-Void Ratio = Volume of Voids / Volume of Solids
For clearstone layer with 40% porosity, should not void ratio be 40% / 60%, or 0.67? SWMM5 also gives "Typical values range from 0.5 to 0.75 for gravel beds"
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